painting roof white to reduce heat inside the house

[DiY By My Hand]

I'm seriously thinking of painting our roof white to reflect at least some of the heat. i'm thinking of using the stuff they used to paint sidewalks with. what is that stuff called and where can I get it?

[beebeenator]

is your roof GI , Ceramic or Cement?

[DiY By My Hand]

roof is GI

[beebeenator]

you will have to douse it with acid etching solution (boysen has it but most of the depot stores dont carry this so you may have to call boysen for availability) so the GI layer gets
micro pore/scratches-a-majig :)

Then enamel paint would be be best and cost effective. I am not sure what the paint they use on the road though and i am not sure if it for masonry only, which might be latex based.

Be better if it is spray painted in several thin coats. Brushing may cause peeling after awhile.

This is by far not a professional opinion but is just somethingi would do

[DiY By My Hand]

It's an old house, and the roof has already been painted previously oxide red, not sure how many times before. do I still need the acid etching solution?

[spyghost]

acid etching will only work on fresh metal surface

[el_camarote]

I'm seriously thinking of painting our roof white to reflect at least some of the heat. i'm thinking of using the stuff they used to paint sidewalks with. what is that stuff called and where can I get it?

Coating with white paint will decrease the heat absorption of the G.I. roof by only minimal percentage. if you really want to deflect the heat on your roof, try the cermamicoat of Flexseal. But most small hardwares don't have them, its by order. try to drop by at wilcon depot.

[guad]

Boysen has Reflectorized Traffic Paint, white and yellow.
Davies has Traffic Paint, white and yellow, regular and reflectorized.

I don't know whether this is what the government actually uses to paint lane markings, etc. on roads, or whether this is appropriate for metal roofs.

[DiY By My Hand]

Coating with white paint will decrease the heat absorption of the G.I. roof by only minimal percentage. if you really want to deflect the heat on your roof, try the cermamicoat of Flexseal. But most small hardwares don't have them, its by order. try to drop by at wilcon depot.

curious to where you got this info from el camarote. what do you mean by minimal? any figures?

[el_camarote]

curious to where you got this info from el camarote. what do you mean by minimal? any figures?

Here's the link for your info:
http://www.scientificblogging.com/news_articles/white_roofs_could_reduce_urban_heat_island_effect_ 33_percent

As to what percentage do Flexseal does to your roof:
http://www.campbridge.com/p_cera.html

Hope these links can satisfy your curiosity. :eek:
Figures are given.

[DiY By My Hand]

Here's the link for your info:
http://www.scientificblogging.com/news_articles/white_roofs_could_reduce_urban_heat_island_effect_ 33_percent

As to what percentage do Flexseal does to your roof:
http://www.campbridge.com/p_cera.html



The first link confirms the general idea of what I want to do, though the type of paint is never mentioned. however, the second link looks like misleading advertising to me. its says: ...much like the ceramic coating used to shed 95% of the heat generated upon re-entry of the NASA's space shuttles... Shields heat by at least 6 degrees Celsius. as a former advertising person i'll be wary of such claims. likewise, why would you say that..: Coating with white paint will decrease the heat absorption of the G.I. roof by only minimal percentage. are you are connected with this product?

[guad]

Re FlexSeal 'ceramic' paint -- hard to say whether it is misleading or promising. Not enough posted info on the effectiveness of the actual product, as opposed to ceramics in general.

Best to call them up and ask if they have and can provide:
- results and description
- of actual controlled tests
- of the actual product (not NASA shuttle tiles or other brands)
- done in the Philippines (not by testing bodies abroad, e.g., ASTM, of similar materials abroad).

If you look into this, let us know what you find out.

[beebeenator]

I would actually agree with El Camarote that having the roof painted white (or reflective) may not have a very significant decrease in Temperature.

Also if you observe Chicken coops and tunnel vented atmosphere controlled piggery houses. They dont have the roofs painted white. These are designed by engineers in pig eating countries like Canada , USA and England. If the reflectivity of the roof can decrease heat significantly then all these structures wouldve been painted white.

conductive heat i suspect is still the major problem. Radiative heat is only a portion of heat product by the sun afterall. Its like if you leave a white t shirt and a black t shirt outside. eventually both temperatures will be almost equal after achieving equilibrium (which doesnt take long especially due to humidity)

Ceramic on the other hand... dunno :P all i know ceramic composites are pretty scratch proof. Great for watches :)

[DiY By My Hand]

I would actually agree with El Camarote that having the roof painted white (or reflective) may not have a very significant decrease in Temperature.

dude, i'm not looking to have 20 degrees inside my house without air conditioning. the primary objective is to get the room temp to be at least 2 to 5 degrees below body temp. and yes it was 38 degrees inside my house yesterday. ambient temp was actually cooler at 36.5

Also if you observe Chicken coops and tunnel vented atmosphere controlled piggery houses. They dont have the roofs painted white. These are designed by engineers in pig eating countries like Canada , USA and England.

IIRC these pig eating countries are not in the tropics. these houses need to retain heat not the other way around

conductive heat i suspect is still the major problem. Radiative heat is only a portion of heat product by the sun afterall. Its like if you leave a white t shirt and a black t shirt outside. eventually both temperatures will be almost equal after achieving equilibrium (which doesnt take long especially due to humidity)

I disagree with this. radiation reflected is not absorbed. less heat absorption means that the heat can dissipate faster. I've built a solar cooker before and I know that color does makes a huge difference in the amount of energy absorbed. a white roof and a black roof will never have the same surface temperature when exposed to solar radiation for the same period of time. are you so sure about the t-shirt thing? will you be willing to stand out in the sun with me in a white shirt and a white hat and you wearing a black shirt and a black hat to see who passes out first? :D

[beebeenator]

These countries design these atmospheric houses for poultry and piggeries from africa to central and south america and philippines. Pigs and chickens thrive best at 20 degrees and some species around 18 degrees (although this is besides the point hehehe :) )

Solar cooker does take the advantage of reflective surfaces. But do observe that the sun's reflection are redirected to a single point by virtue of a parabolic shaped reflector bowl

White tshirt and black t shirt example is used to illustrate final temp when Equilibrium is achieved. Of course, I , in the black shirt will pass out earlier than you, in the white tshirt. But trust me you too will pass out perhaps a couple of hours later only. Hence if a reflective roof can thwart the increase of the inside temp only by a few hours before it achieves equilibrium, then its not really worth it.

Best way to dissipate heat in an enclosed environment is to have air exchange (this is assuming full-on insulation is just too costly to be practical and air conditioning is just ..well bloody expensive) from the outside air (if it is cooler, which in your case, it is)

[DiY By My Hand]

Solar cooker does take the advantage of reflective surfaces. But do observe that the sun's reflection are redirected to a single point by virtue of a parabolic shaped reflector bowl

actually no, my solar cooker was nothing more than a GI sheet box painted flat black, sure it can't boil water but it can fry an egg. :D

Hence if a reflective roof can thwart the increase of the inside temp only by a few hours before it achieves equilibrium, then its not really worth it.

does that assume that the sun intensity is constant throughout the day? there is only the 4 hours of intense sunlight, after that it's starts to diminish. and there are also clouds, and it only takes a few minutes of cloud cover to cool a GI roof.

and in my case there is only 4 hours of sun light that I need to shade my roof from and after that, my neighbor's 3 storey house shades our single storey bungalow. :D

[beebeenator]

yeah it assumes that you dont have any structures lending you a shade :)

if thats the case then a White roof will do you a lot of good. Wish i had two tall neighbors... hmmm

You should try the parabolic shaped bowl. Uses aluminum foil... I only read on it though... no actual hands on.

Good luck on your heat problem. I am planning to retrofit a giant fan/exhaust fan at the attic. To Take advantage of getting rid of hot air that gets stuck upstairs and bring in new air from down stairs. Will be useful only starting late afternoon.

[DiY By My Hand]

Eventually, I would like to do this: Passive Air Conditioning (http://www.thefarm.org/charities/i4at/lib2/aircool.htm)

http://www.thefarm.org/charities/i4at/lib2/aircool.jpg

[el_camarote]

I think that you know better than a senior handyman, DiY By My Hand. And no need to ask opinion on things. you are very suitable to have your own web site, and if does happen, please let us know. :cool:

[DiY By My Hand]

I think that you know better than a senior handyman, DiY By My Hand. And no need to ask opinion on things. you are very suitable to have your own web site, and if does happen, please let us know. :cool:

you get me wrong el camarote, I welcome any opinion, good or bad. however, i've always been dubious of biased opinions, especially those that endorse a particular product with insufficient proof.

[el_camarote]

Noted on that. Anyway, good luck on future projects.

[22y]

Hi,
That cooler you have drawn does not work in areas of relatively high humidity (i.e. Pinas). You probably will end up with a moldy house. Your problem is the heat you can feel from the ceiling. Getting rid of this heat will solve half your problems. One effective house cooling method is to provide ventilation in the loft (kisame).

Just my 2 cents.

[austport.paint.center]

I'm seriously thinking of painting our roof white to reflect at least some of the heat. i'm thinking of using the stuff they used to paint sidewalks with. what is that stuff called and where can I get it?
Maybe you could try Destiny kooltex reflects 50% of the heat from the sun and can save aircon cost

[RUMARAGASA]

i was searching for roof insulation and was directed to this very

interesting discussion here about painting the roof WHITE

anyway, WHITE roof is fast becoming the trend even here in PI.


last year, 2 of my neighbors had already repainted their roof white

and one new 4 story factory building also has white roof with

continues opening on all 4 sides of the attic..


2 weeks ago , I decided to patch / paint our 15 yr old roof WHITE.

I went to the 3 big hardware stores along edsa balintawak and

bought some sample materials for testing,

since I never had the chance to used it before.

RUBBER paint, fine fiber mesh cloth and WHITE elastomeric paint


so far, im very happy with the result.

rubber paint is water base and is very easy to apply with brush

compared to other sticky cementitious sealant.


with the mesh, we were able to continuesly cover all the

bad GI's / flashing's horizontal and vertical joints..


and these are the temperature readings taken from an IR

thermometer yesterday saturday noon time
.

roof - WHITE elastomeric paint - 45 celsius

roof - dirty WHITE rubber paint on patching - 47 c

roof - remaining old red oxide paint - 58 c

room - 31 c

ceiling plywood - 35 c

ceiling plywood inside the attic - 38 c


Im also testing the reflective aluminum insulation and exhaust fan

for the attic..

i plan to finish painting the walls and roof before the heat

starts on february 4.

[guad]

roof - WHITE elastomeric paint - 45 celsius
roof - dirty WHITE rubber paint on patching - 47 c
roof - remaining old red oxide paint - 58 c

room - 31 c
ceiling plywood - 35 c
ceiling plywood inside the attic - 38 c


Interesting test. Been looking for quantitative comparisons like this for locally available products under local conditions. (Though the bottom line, energy/cooling cost, is harder to compare by controlled experiment.)

Can you say the specific brand and names you tested, e.g., was the first one FlexSeal CeramiCoat? (Which is not only white but ceramic. Don't know if it is considered elastomeric.)

Was your test method to re-paint two patches of the same roof and compare the two patches against the existing red oxide painted roof (= third patch), by measuring the temperature on the underside of the different patches?

[RUMARAGASA]

http://i75.photobucket.com/albums/i303/rumaragasa/newbuilding-1.jpg



http://i75.photobucket.com/albums/i303/rumaragasa/repaintedwhite.jpg


guad,

about branded local roof paints, I did not buy any of them but I did look at their samples

and scraped it with a pocket knife, they break or chip off or become powdery.

I have use that kind of paint before and what remains on our roof is red oxide.

I also scraped the new paint on the floor of sm annex parking lot,

its tough and I like to know what it is.


I am looking for something elastic that will move along with my old roof.

I do not know what will happen to the elastomeric white paint after

one year but its worth trying something new.

if red oxide comes out in 2012, I will paint again with expensive white rubber paint,


about flex seal ceramic , it is not elastomeric .

I bought samples from the waterproofing section.


I also do not trust leading USA paint companies even if they do test,

since they always test their WHITE insulation paint against black or GRAY.

their white vs white chalk will do.


I did read the outside and underside of our old GI roof,

the difference is less than one degree.

[clayfigur]

I was also thinking of painting the roof with white epoxy enamel thinly, before painting it with regular enamel to thicken the coat..

In my experience, epoxy enamel is not good when directly expose to sunlight. so a regular enamel coat should cover it..

[rosy]

By all means go ahead paint your roof white, there's nothing wrong with that and it will even beautify your house roofing, as long as you have carefully followed proper proceedures before applying your paints.

Di ba may kasabihan tayo na " light colors deflects heat, and dark colors
absorb heat ".

Painting your roofings white will only minimize small amount of hot air
inside your house, the best possible solution is that you install insulations under your roofs giving it a minimum spacing of 6 inches
between the underside of the roof and the above side of the insulation.

I am suggesting this because this is based on my actual experience
in my house. I have painted my roofs several times with Flexseal
elastomeric insulating paint, they call it "CERAMICOAT" and yet it is
still hot inside the house specially during the summer months. I did
experimented with my house since some parts of my house
doesn't have yet a ceiling and still under construction and so
LO and BEHOLD rooms with insulations and finished ceilings were truly very much cooler than rooms without insulations.

The rooms without insulations, you can really feel the heat penetrating from the GI roofing sheets down to the surface of the tables and other furnitures inside the house. May I simply suggest
in case you opt to install insulations in your ceilings, choose the thicker ones with double sided aluminum sheetings and believe you me you'll have cooler rooms inside your house.

I honestly hope this tip will be of great help to you and to all our friend at PHM. Pahabol tip, see if you can install also an exhaust ventilator
in some of your rooms to expel hot air coming from the windows.8)
thanks.

[andres_88]

Re FlexSeal 'ceramic' paint -- hard to say whether it is misleading or promising. Not enough posted info on the effectiveness of the actual product, as opposed to ceramics in general.

Best to call them up and ask if they have and can provide:
- results and description
- of actual controlled tests
- of the actual product (not NASA shuttle tiles or other brands)
- done in the Philippines (not by testing bodies abroad, e.g., ASTM, of similar materials abroad).

If you look into this, let us know what you find out.

Hello everyone. Long time lurker but first time poster on this forums.

So quad, if the tests for FlexSeal Ceramicoat is not to be done by ASTM standards, CRRC standards (Cool roof rating council) and other testing bodies abroad - who do you suggest conducts the tests here?

I'll offer a few to get the ball rolling. DOST - they dont conduct this type of tests. Private testing facilities - also dont conduct this kind of testings. So who do we turn to? - tests abroad. I know that this kinds of test for insulating coatings are kinda new, but they are now the trend. Either we embrace it or just stick to the old ways of insulating.

This link will help people understand what ceramic microspheres insulating coatings can do and what it cant do. Remember, there is no miracle product that will solve every problem - but this will probably help. On youtube: watch?v=D6RQpZODzx0&feature=related

The microspheres that is incorporated in FlexSeal Ceramicoat is actually borosilicate hollow glass. I will quote wikipedia on borosilate glass (not the hollow ones, we will discuss that later.

Quoted on wikipedia:

Borosilicate glass is a type of glass with the main glass-forming constituents silica and boron oxide. Borosilicate glasses are known for having very low coefficients of thermal expansion (~3 × 10−6 /°C at 20°C), making them resistant to thermal shock, more so than any other common glass. Such glass is less subject to thermal stress and is commonly used for the construction of reagent bottles.

Borosilicate glass has a very low thermal expansion coefficient, about one-third that of ordinary glass. This reduces material stresses caused by temperature gradients, thus making it more resistant to breaking. This makes it a popular material for objects like telescope mirrors, where it is essential to have very little deviation in shape. It is also used in the processing of high-level radioactive waste, where the waste is immobilised in the glass through a process known as vitrification (contrast with Synroc).

The thermal insulation tiles on the Space Shuttle are coated with a borosilicate glass. (Unquote)

3M has conducted many tests for this kind of microspheres and has spent millions of dollars for solar paints. Video is here: on youtube watch?v=T6ZBRoJdz9o

As well as BASF, the world's largest chemical company and AKZO NOBEL, one of the world's largest coating manufacturer. Incorporating microspheres into paints is a delicate procedure that if you put in in a paint and dispersed it too much - it breaks.

About white paints for heat reflection of roof, here is a video of Dr Steven Chu, Secretary of Dept of Energy of the USA talking about how a simple white roof paint can help - the video is here: on youtube watch?v=5wDIkKroOUQ

About the borosilicate hollow glass microspheres, it is has low thermal conductivity - around 0.04 W/mK. To give you an idea the thermal conductivity of other materials, I will show you some examples:

Cement - 1.73
Steel - 54
Glass - 1.05
Porcelain - 1.50
Rock - 7.0
Stainless Steel - 16

Just to name a few. So you see, putting microspheres into paint as a filler reduces its overall thermal conductivity - thus reducing heat absorbed. The white color part is for the solar reflectivity. And the microspheres is for the thermal emmissivity.

Hope I answered some of your questions on FlexSeal Ceramicoat.

Peace.

[violaine]

@andres_88,

your post is very informative and my pea-size brain digested all what you said.

as far as lab equipment is concerned, pyrex, a leading glass manufacturer has also been using this borosilicate glass in their range of test tubes and other glasswares since the 60's i believe.

but making them into microspheres and adding them to paints is another story.

:cool:

PS

but why ceramicoat with the flexseal? hardly any ceramic mentioned...ahh marketing jargons.

[andres_88]

@andres_88,

your post is very informative and my pea-size brain digested all what you said.

as far as lab equipment is concerned, pyrex, a leading glass manufacturer has also been using this borosilicate glass in their range of test tubes and other glasswares since the 60's i believe.

but making them into microspheres and adding them to paints is another story.

:cool:

PS

but why ceramicoat with the flexseal? hardly any ceramic mentioned...ahh marketing jargons.

Oh thank you violaine for pointing out why no ceramics were mentioned. May I quote wikipedia on what ceramics is as follows:

A ceramic is an inorganic, non-metallic solid prepared by the action of heat and subsequent cooling.[1] Ceramic materials may have a crystalline or partly crystalline structure, or may be amorphous (e.g., a glass). Because most common ceramics are crystalline, the definition of ceramic is often restricted to inorganic crystalline materials, as opposed to the non-crystalline glasses.

What you might think of ceramics is that it is the same as the ceramic cookwares that we used in the house. But to say the least, ceramics are made in various forms - like ceramic microspheres. The term "ceramic microspheres" is the term used for this borosilicate hollow glass microspheres for the layman to understand.

Hmmm, marketing jargon. Ceramic microspheres or specifically the scientific name which is borosilicate hollow glass microspheres are used interchangeably. We just used ceramic microspheres because it is shorter and more readily understandable.

As for the pyrex glass made into microspheres then added to paints. 3M made a lot of research and development of this materials. You can google - 3M Glass Bubbles or you can watch a 2 minute video on youtube - just search 3M Glass Bubbles to better understand how it insulates your paint by simply adding microspheres in it.

Again, peace.

[andres_88]

The first link confirms the general idea of what I want to do, though the type of paint is never mentioned. however, the second link looks like misleading advertising to me. its says: as a former advertising person i'll be wary of such claims. likewise, why would you say that..: are you are connected with this product?

In response to DiY. In my first post here in this forums, I showed a link of where this kind of coatings are used in the space shuttle. Quoted on wikipedia as follows: The thermal insulation tiles on the Space Shuttle are coated with a borosilicate glass. No misleading advertising intended and used. You can find detailed information on wikipedia with reference number 6 on the bottom.

And I dont know if el is connected with this product but I am.

Peace :)

[violaine]

What you might think of ceramics is that it is the same as the ceramic cookwares that we used in the house.

exactly...ceramic knives as well.

now i know better.

;)

[andres_88]

What you might think of ceramics is that it is the same as the ceramic cookwares that we used in the house.

exactly...ceramic knives as well.

now i know better.

;)

Just here to help inform people violaine :)

[RUMARAGASA]

from http://en.wikipedia.org/wiki/Emissivity

"In general, the duller and blacker a material is, the closer its emissivity is to 1.

The more reflective a material is, the lower its emissivity. Highly polished silver has an

emissivity of about 0.02.[1]"



white paint alone will help alot in the emissivity of a roofing material.

[andres_88]

from http://en.wikipedia.org/wiki/Emissivity

"In general, the duller and blacker a material is, the closer its emissivity is to 1.

The more reflective a material is, the lower its emissivity. Highly polished silver has an

emissivity of about 0.02.[1]"

Exactly RUMARAGASA, here's another diagram to show how it works:

http://www.coolroofs.org/images/Diagram_1_002.jpg

Photo taken from Cool Roof Rating Council - http://www.coolroofs.org/

[violaine]

can anyone start a thread about asphalt shingles?

i havent installed one but id love to know the pros and cons if installed here in the tropics.

i simply know that they are quite expensive considering the initial installation of marine plywood (3/4") then the mastic (asphalt) and finally the shingles.

i know also that asphalt shingles are short lived.

but they are aesthetically wow especially for my dream gazebo.

and cooler too.

[RUMARAGASA]

white ceramic paint vs cheap white paint:

http://i75.photobucket.com/albums/i303/rumaragasa/MONOLITHICDOME.jpg

"After several months of consistently monitoring exterior and interior temperatures, we found:

….The structure with the ceramic coating showed that it reflected sunshine slightly better than

the structure with the white paint. The operative word here is slightly – at most, a few degrees "

read more from monolithic.com/stories/ceramic-coating-insulation-or-reflective-surface

[guad]

re flexseal 'ceramic' paint -- hard to say whether it is misleading or promising. Not enough posted info on the effectiveness of the actual product, as opposed to ceramics in general.

Best to call them up and ask if they have and can provide:
- results and description
- of actual controlled tests
- of the actual product (not nasa shuttle tiles or other brands)
- done in the philippines (not by testing bodies abroad, e.g., astm, of similar materials abroad).

If you look into this, let us know what you find out.

So quad, if the tests for flexseal ceramicoat is not to be done by astm standards, crrc standards (cool roof rating council) and other testing bodies abroad - who do you suggest conducts the tests here?

I'll offer a few to get the ball rolling. Dost - they dont conduct this type of tests. Private testing facilities - also dont conduct this kind of testings. So who do we turn to? - tests abroad.

<Long discussion on technology deleted.>

hope i answered some of your questions on flexseal ceramicoat.


Glad that there was a reply to my earlier post.

If you cannot get the government or an independent local facility to test the actual CeramiCoat product, then the answer should be obvious -- yourself (Campbridge). Campbridge may not be the most unbiased tester, but it would be better than what we have now, which is nothing (system-wise and of actual product). And if you describe your testing method(s) and results in enough detail, we consumers can make judgements on the validity of your testing.

There are lots of references to the underlying technology and foreign tests of the underlying technology, but what is missing is whether and how much this translates to performance of the actual system. It's nice to know about the materials technology but we need to know the system bottom-line. Is a CeramiCoat roof any better than an ordinary white roof and if so, how much better quantitatively?

May we know what testing Campbridge has done to quantify the bottom-line benefit of CeramiCoat? Is it just temperature tests? Multiple structures, one with CeramiCoat, another with ordinary white paint, etc.? If so, can you share a description of the experiment, measurements taken, etc.?

The next level of bottom-line testing would be energy. That is the real bottom-line, isn't it, but harder to do. Multiple identical (except for the roof paint) structures, measuring the energy required for A/C to maintain the same average interior temperature over a period of time. Has Campbridge done this kind of testing? Can you share the results?


white ceramic paint vs cheap white paint:
"after several months of consistently monitoring exterior and interior temperatures, we found:
….the structure with the ceramic coating showed that it reflected sunshine slightly better than the structure with the white paint. The operative word here is slightly – at most, a few degrees "

http://www.monolithic.com/stories/ceramic-coating-insulation-or-reflective-surface


Just to repeat the point made in this previous post: The link given comes to this conclusion:
"As can be seen from the graphs, there is little difference in temperature between the white paint and the ceramic coatings."

So this is the hurdle that CeramiCoat has to make, giving actual system test data (not just description of materials technology) to convince consumers that CeramiCoat provides significant benefit over ordinary white paint. So far I have not seen any bottom-line system test data from Campbridge in this regard.

I don't think testing of system bottom-line is rocket (or materials) science.

In absence of such data, I can only assume or speculate that bottom-line testing hasn't been done by Campbridge; or that it was done. but the results suggest that the benefit of CeramiCoat over ordinary white paint is not that significant, as the previous post noted.

[andres_88]

Quad,

As a member of ASTM International, we adhere to ASTM test methods. Here is the technical specs of FlexSeal Ceramicoat as seen here: http://www.campbridge.com/Ceramicoat%20Insulating%20Paint%20Technical%20Info .html and consequently the product have been submitted to ENERGY STAR for labelling (it takes a long time to get labelled).

http://www.campbridge.com/images/ceramicoat%20back%20ok1.png

ASTM C236:

1. Scope

1.1 This test method, known as the guarded hot box method, covers the measurement of the steady-state thermal transfer properties of panels. In distinction to Test Method C177, which is primarily applicable to homogeneous samples, the guarded hot box method provides for the evaluation of thermal performance of building assemblies. This test method is suitable for building construction assemblies, building panels, and other applications of nono-homogeneous specimens at similar temperature ranges. It may also be used for homogeneous specimens.

1.2 This test method may be applied to any building construction for which it is possible to build a reasonably representative specimen of size appropriate for the apparatus.
Note 1-A calibrated hot box, Test Method C976, may also be used for the described measurements and may prove more satisfactory for testing assemblies under dynamic conditions (nonsteady-state) and to evaluate the effects of water migration and air infiltration. The choice between the calibrated or the guarded hot box should be made only after careful consideration of the contemplated use.

1.3 In applying this test method, the general principles outlined must be followed; however, the details of the apparatus and procedures may be varied as needed.

1.3.1 The intent of this test method is to give the essential principles and the general arrangement of the apparatus. Any test using this apparatus must follow those principles. The details of the apparatus and the suggested procedures that follow are given not as mandatory requirements but as examples of this test method and precautions that have been found useful to satisfy the essential principles.

1.3.2 Persons applying this test method shall be trained in the methods of temperature measurement, shall possess a knowledge of the theory of heat flow, and shall understand the general requirements of testing practice.

1.3.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Note 2-While various units may be found for thermal properties, the International System of units is used exclusively in this test method. For conversion factors to inch-pound and kilogram-calorie systems, see Table 1.

And quad if you need the confidential results of comparison for other paint brands - I will gladly show you the BASF report. Just call our office anytime you are free and look for me. Also, I am not telling people not to paint their roof with white elastomeric roof paint because they do reflect a lot too - I'm just saying that the addition of microspheres in Ceramicoat gives the paint more thermal emittance (emmisivity of 0.91) than white elastomeric roof paint as can be seen on number 3 of capabilities as shown here:

http://www.campbridge.com/images/ceramicoat%20PAGE%204.png

[violaine]

that says it all.amen.

[RUMARAGASA]

Also, I am not telling people not to paint their roof with white elastomeric roof paint because they do reflect a lot too - I'm just saying that the addition of microspheres in Ceramicoat gives the paint more thermal emittance (emmisivity of 0.91) than white elastomeric roof paint

thank you for this sincere response and the link to the astec video which shows that

it is a must to cover all roofing joints with mesh/rubber paint

to protect and prolong the GI material.

practical DIY home maintenance

[andres_88]

thank you for this sincere response and the link to the astec video which shows that

it is a must to cover all roofing joints with mesh/rubber paint

to protect and prolong the GI material.

practical DIY home maintenance

Youre welcome :)

Since were in the subject of Elastomeric Roof Paint, let me introduce you to our FlexSeal Roof Gloss Elastomeric Roof Paint.

http://images04.olx.com.ph/ui/11/47/28/1296789963_163683928_2-FlexSeal-Elastomeric-Paint-Rated-no1-Elastomeric-Paint-Kim-Atienza-Waterproofing-Paint-Manila.jpg

It is available in 24 attractive roofing colors including white :)

And btw, the video is here: http://www.youtube.com/watch?v=QmYn3bQYgI8

Peace

[rickybernard]

This is my first time to post here, and I am very interested in painting my roof white. Has there been an actual test done here in the Philippines, when it comes to the benefit of a normal white painted roof against a ceramic painted roof? It would be nice to see if there is a big difference between the two. I saw a video on youtube where a wall was painted with a normal white paint and another side was painted with a ceramic type paint. They were able to show a difference of 10 to 14 degrees Celsius difference. Any added information of available Philippine data would be appreciated.

Thanks.

"You turned off your lights, now paint your roof white." :D

[bmac]

light colors reflect heat. yun lang.

kung paint meron maintenance yan

better to use insulation material. one time expense.

[rickybernard]

light colors reflect heat. yun lang.

kung paint meron maintenance yan

better to use insulation material. one time expense.

I'm not really a handyman. All that I know is what I have seen on youtube. It says in one video that insulation will increase the heat resistance of your roof. This will allow a slower transfer of heat. Painting your roof with correct paint will actually reflect most of the heat. This is what Super Therm states. Super Therm is a ceramic paint. I would like to know if Flexseal Ceramicoat is the same as SUper Therm.

Thanks.

[bmac]

for information only. end user pa din ang final decision maker based on the options available to him.

[Horsepower]

question: What can you put over a corrugated roof to minimize rain noise? Will asphalt help? By the way, my roof is colorbonded.

[zepol]

light colors reflect heat. yun lang.

kung paint meron maintenance yan

better to use insulation material. one time expense.

I've had some experience with that. I retrofitted the ceiling of our rented house with foam insulation. Linapag ko lang sa ceiling. Later on I cut some into 12x12 squares to fit in between pamakuan, then covered it with an additional layer of thinner insulation. I also patched the gaps with tape (it's useless kung malaki ang awang because sumusuot ang hot air underneath.

The result? A palpable difference in room temperature (around 10 F sometimes). Maybe more. Tapos nabawasan yung electrical bill ko by at least 1k (probably more since after the installation, we only use airconditioning 60% of the time)

I spent about 3k all in all for the material, which can be removed and reused when I move.

Another thing I did was to install a small exhaust fan to blow air into the kisame. It was just a 600 peso 8 incher. There was a kulob na area in the house, so the fan blew the stale air from there into the kisame, another huge temperature difference, for a 20 watt fan.

Of course, premium paint for the roof is a no go for me since I'm just renting.

[mig21]

Newbie here. based on our experience, previously our GI roof color was a very dark russet brown roof paint from DAvies. Our attic became extremely hot with this color. Since our roof frames are made of wood, i was scared the extreme heat would become a fire hazard to the frames. I decided to paint it over with a lighter color, Island Roof Kote Ivory. NOw, we can really feel the difference - its cooler with a lighter color. With regards to the Flexseal insulating paint .. i wish i could have tried it!