Cool Roof Performance - impressive

[Davegvg]

Just reroofed using Owens Corning Shasta white high reflectivity shingles. I done have a ton of data, but so far Ive seen a drymatic difference in temperatures

At the end of the day the temp probe in the sun was at 96 degrees and after a full day of heat soak the living area and bedroom never exceeded 75.
The second story was only 81 after baking in the sun all day.

Compare to 96 and 97 before.

Bottom left is temp in sun, upper right second story, upper left temp in shade in back yard, lower right temp in my office. ( I was using AC in the before picture on the bottom floor)


Before Cool roof.


After

 

[bluedog225]

I took a laser thermometer out to the gray pavement this summer, 140 eff. Jeeze.

I’ve used a lot of the home depot henry’s elastomeric cool roof. Snow white. It’s always cool enough to put your hand down on it.

 

[Davegvg]

I took a laser thermometer out to the gray pavement this summer, 140 eff. Jeeze.

I’ve used a lot of the home depot henry’s elastomeric cool roof. Snow white. It’s always cool enough to put your hand down on it.

And people wonder why air cooled RV gensets stop running on 100 degree days in black asphalt.

 

[Zeke]

I got a 16º differential after applying white silicone roof coating to my flat uninsulated garage roof. The stuff works.

 

[dogdog]

They are cool, but these dam sillycone are costly now from $180 per 4.5 gallon to almost $300 stones per 4.5 gallon.

 

[240sxguy]

When I had the flat roof redone on my finished porch I requested white membrane for this reason. Unfortunately they were not able to get it at the time so I got black. Ultimately I am in WI and that area is heavily shaded on the north side of the house so its not a huge issue for me.

Do you have any photos of the house with it installed? Perhaps it'd be worthwhile when I redo my detached garage roof.

 

[jar944]

The fact that we continue to use dark colored roofing materials is just stupid. (But I still have a dark gray roof myself)

 

[kwb]

Dark materials often have better UV characteristics in terms of $/lb and don't fail as soon due to exposure to the sun.

I chose a lighter color of shingles but it still is pretty dark and absorbs a lot of heat from the sun. I will be due for another roof in about 10yrs. Maybe my vanity on how my house looks will be down to IDGAF at that point and do something for the sake of cheap power (cooling) bills.

 

[yeldogt]

The fact that we continue to use dark colored roofing materials is just stupid. (But I still have a dark gray roof myself)

heat in the winter

 

[jar944]

heat in the winter

You are better off with solar gain from windows than letting you attic get to 40 degrees.

 

[Davegvg]

Dark materials often have better UV characteristics in terms of $/lb and don't fail as soon due to exposure to the sun.

I chose a lighter color of shingles but it still is pretty dark and absorbs a lot of heat from the sun. I will be due for another roof in about 10yrs. Maybe my vanity on how my house looks will be down to IDGAF at that point and do something for the sake of cheap power (cooling) bills.

Interesting whats the reference on the lighter colored shingle failing?
Wouldn't the cooler shingle last longer all other things being equal?

Owens Corning offered me the same warranty and price within each line of product regardless of color.

 

[Old Man Roger]

Always thought all roofs in south Florida should be white.

 

[kwb]

They will do that. I am sure they have a bit better material cost on the darker stuff. - I am speaking of materials in general.

The top layer of your typical roof shingle is there to protect the fiberglass and other mix of stuff from the sun. Same as the old tar roofs that were covered in pea gravel.

Tires are black for the same reason - Carbon black is a cheap additive and greatly improves UV performance of the material. It is why most of the mold in color parts on your car are either black or charcoal in color.

 

[Zeke]

They are cool, but these dam sillycone are costly now from $180 per 4.5 gallon to almost $300 stones per 4.5 gallon.

I paid $400 with sales tax. That will do about 300 sq ft. depending on surface condition. Most of the time it pays to use the primer. Then you can get closer to 400+ sq ft coverage.

 

[dogdog]

I paid $400 with sales tax. That will do about 300 sq ft. depending on surface condition. Most of the time it pays to use the primer. Then you can get closer to 400+ sq ft coverage.

yes, didn't realized the price went up 100%+ compare to few years ago when I rolled mine 2000'sqft flat roof, it was $180/bucket if you buy 10 bucket or more... otherwise $240/per. no primer need for silicone but still needed a good brush and rinse... Noting peel so far (x years, I have a thread asking white roof products some time back), just spots that was white now off white or yellowing, 1 bucket covers about 150sqft actually or a bit under 200sqft.... #9 or #10 nap thick paint roller is all I have used, just have to watch for the manufacture date and the seal is not disturbed when you but those bucket. Anything pass 9 months of the manufacture date, don't get it (there is a recommendation on the fine print) . Anything seal that is broken, don't get it.

this was what I used, not the best performance but it is readily available and return policy just in cause I over estimate is good with HD.

Henry 887 Tropi-Cool 4.75 Gal. 100% Silicone White Roof Coating HE887HS018 - The Home Depot

Henry 887 Tropi-Cool 100% Silicone White Roof Coating is a premium, 100% silicone, moisture-cure coating designed to reflect the sun's heat and UV rays as well as protect many types of roofs. Now with

www.homedepot.com

you can choose product from for other maufacture products and resources.

CRRC Roof Directory

 

[yeldogt]

You are better off with solar gain from windows than letting you attic get to 40 degrees.

Most of my projects have been in the mid-atlantic -- Not sure if one is better than another. I tend to like the look of darker roofs on traditional buildings. With spray foamed decks it's not really an issue in my climate -- or north where I have also built.

light roofs seem to stain earlier -- although the technology has improved

 

[mike93lx]

The fact that we continue to use dark colored roofing materials is just stupid. (But I still have a dark gray roof myself)

Agreed.

And my next roof will be dark again. No desire to set a trend of light colored roofs when every single other house is dark.

 

[jar944]

Agreed.

And my next roof will be dark again. No desire to set a trend of light colored roofs when every single other house is dark.

I'd consider white/light standing seam.

 

[talonboy]

Agreed.

And my next roof will be dark again. No desire to set a trend of light colored roofs when every single other house is dark.

When I had my home roof redone years ago, the roofing guy educated me on shingle colors. He said the color you select can vary, depending on how much tree shade you have. In short, the darker the color, the quicker it drys after rain. If your roof is shaded by trees, a light color will grow mold and ruin the singles in less time than a darker shingle.

So in short, in a wet, shady area use black shingles. In a dry climate with little tree shade, use a lighter color shingle. As I was told.

 

[mike93lx]

I'd consider white/light standing seam.

With white siding, it would look great. On my house though...not so much. Maybe I'm wrong though

 

[jar944]

With white siding, it would look great. On my house though...not so much. Maybe I'm wrong though

Yeah.. No. I agree white wouldn't work.

 

[iadr]

Thinking that was sarcasm/irony (?) as that looks great!!

 

[mike93lx]

Thinking that was sarcasm/irony (?) as that looks great!!

To each their own. I don't think the house that @jar944 posted looks bad, but it also has existing white accents. My house is all beige.

Copper would probably look great, but I don't like my house nearly enough to spend that kind of money

 

[reader2580]

To each their own. I don't think the house that @jar944 posted looks bad, but it also has existing white accents. My house is all beige.

Copper would probably look great, but I don't like my house nearly enough to spend that kind of money

You can get metal roofing with copper colored paint on it. Real copper will oxidize relatively quickly. My parent's church has quite a bit of copper on it. The copper is all oxidized to a grey brown color. A lot of people probably don't realize it is copper. 25 years ago a storm damaged some of the copper and it was replaced. It took a few years to weather to match the old copper.

 

[CraigStu]

It seems to me that aside from the tree shade and mold angle, roof color should go with whether a house spends more time needing to be cooled or needing to be heated. Homes in the south should have light roofs and homes in the north should have dark roofs.

 

[Old Man Roger]

It seems to me that aside from the tree shade and mold angle, roof color should go with whether a house spends more time needing to be cooled or needing to be heated. Homes in the south should have light roofs and homes in the north should have dark roofs.

Yup, always seemed obvious to me.