EcoRenovator  

Go Back   EcoRenovator > Improvements > Conservation
Advanced Search
 


Blog Register 60+ Home Energy Saving Tips Recent Posts Search Today's Posts Mark Forums Read


Reply
 
Thread Tools Display Modes
Old 07-07-11, 04:22 PM   #21
virginiajim
Lurking Renovator
 
Join Date: Sep 2010
Posts: 3
Thanks: 3
Thanked 0 Times in 0 Posts
Default Sources of roof paint

A few years ago I looked into roof paint that incorporates ceramic reflective beads which could be applied to asphalt shingles from a company called Hy-Tech Insulating Roof Paint. I never could find information about an actual case of such an application, or what it looked like. The paint is expensive and you would prefer to have an attractive result. Has anyone experience with thermal reflective paint? Has the discussion here so far only involved white latex paint?

Jim in Smithfield, VA

virginiajim is offline   Reply With Quote
Old 07-07-11, 09:56 PM   #22
tomboy mom
Helper EcoRenovator
 
Join Date: Jan 2011
Location: arizona
Posts: 39
Thanks: 5
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by Daox View Post
Painting the roof would still be a good idea and would help. It will still get hot and the radiant barrier will still help once the roof has heated up.
if only the hoa would feel the same way .
tomboy mom is offline   Reply With Quote
Old 07-10-11, 01:57 PM   #23
rhino 660
Apprentice EcoRenovator
 
Join Date: Oct 2010
Posts: 105
Thanks: 0
Thanked 10 Times in 8 Posts
Default

yea i thing my Nazi hoa will gas me for painting my roof white... maybe ill do it just to be a rebel, ive been contemplating it for about 2 years now lol.
rhino 660 is offline   Reply With Quote
Old 03-15-12, 10:37 PM   #24
rhino 660
Apprentice EcoRenovator
 
Join Date: Oct 2010
Posts: 105
Thanks: 0
Thanked 10 Times in 8 Posts
Default

well im preparing to go to my HOA and ask for premission to paint my roof white
__________________
2 ton geo unit 2400' HDPE slinkey
4KW solar with battery backup
$8.98 power bill
rhino 660 is offline   Reply With Quote
Old 03-20-12, 09:14 PM   #25
Plantman
Lurking Renovator
 
Join Date: Feb 2012
Location: Angola, IN
Posts: 24
Thanks: 0
Thanked 3 Times in 3 Posts
Default

So if heating load is greater than cooling load, it would be advantageous to have a dark roof that heats up in winter than a light roof that reflects heat in summer? What about greenhouse paint that is white but designed to last only through the warm part of the growing season and is mostly washed off by rain by the following winter when the sun is needed to heat the greenhouse?
Quote:
Originally Posted by S-F View Post
Sounds great but in mixed temperature climates it's probably not such a good idea. I can live with a hot house easier than a cold house. I can survive 90 degrees inside but 0 degrees would be difficult.
Plantman is offline   Reply With Quote
Old 03-20-12, 11:36 PM   #26
MN Renovator
Less usage=Cheaper bills
 
MN Renovator's Avatar
 
Join Date: Nov 2010
Location: Minneapolis, MN
Posts: 928
Thanks: 41
Thanked 111 Times in 86 Posts
Default

Quote:
Originally Posted by Plantman View Post
So if heating load is greater than cooling load, it would be advantageous to have a dark roof that heats up in winter than a light roof that reflects heat in summer? What about greenhouse paint that is white but designed to last only through the warm part of the growing season and is mostly washed off by rain by the following winter when the sun is needed to heat the greenhouse?
It doesn't work that way because your roof needs to stay cold in the winter or you'll have ice dams. This is one reason why there are issues if attics aren't either ventilated or directly insulated. I've been in my attic when its 30 degrees outside with no clouds and the sun up for hours when it wasn't covered in snow, you still need a coat. Don't forget once the black roof is covered in white snow, it doesn't matter what color your roof is anymore and there is less sun in the winter too which is why it is a much bigger deal in the summer.
MN Renovator is offline   Reply With Quote
Old 03-21-12, 07:48 PM   #27
Plantman
Lurking Renovator
 
Join Date: Feb 2012
Location: Angola, IN
Posts: 24
Thanks: 0
Thanked 3 Times in 3 Posts
Default

What if you have a cathedral ceiling with no attic?
Plantman is offline   Reply With Quote
Old 03-21-12, 08:01 PM   #28
MN Renovator
Less usage=Cheaper bills
 
MN Renovator's Avatar
 
Join Date: Nov 2010
Location: Minneapolis, MN
Posts: 928
Thanks: 41
Thanked 111 Times in 86 Posts
Default

"or directly insulated." The roof has insulation directly against it(between the roof decking and ceiling) which will be similar. In a situation where there is a large cavity such as a flat ceiling and a sloped roof, that extra space needs to be vented unless the roof itself has insulation directly against it. In a case where there is a flat ceiling and an open cavity with insulation against the roof(called a 'hot roof'), the entire cavity is considered conditioned space since normally you wouldn't put insulation against both the roof and between the ceiling and the living space, its one or the other, otherwise issues with moisture become a real problem unless that space is vented and if its vented you wasted some money on insulated both sections. ..unless the 'insulation' against the roof is a reflective heat barrier but I don't consider those insulation like some people say they are. I like to use insulation as a term used for a barrier to conductive heat transfer, hopefully in conjunction with a proper convective heat barrier as part of the system.
MN Renovator is offline   Reply With Quote
Old 03-22-12, 04:13 PM   #29
S-F
You Ain't Me
 
S-F's Avatar
 
Join Date: Nov 2009
Location: Northampton MA
Posts: 662
Thanks: 6
Thanked 70 Times in 58 Posts
Default

Yeah I agree that this should be only academic. If you have a vented roof I think there should be R-60 up there and then it doesn't matter what color your roof is.... unless you need to go up in the attic in the summer. In the summers here i New England where everyone has back shingles I am SUFFERING. Sure the home owners talk about how cool the house is after R-60 is in place but putting it there is miserable. Nothing like blowing cellulose in a cramped space in 130 degree heat. Even if you use good cellulose that isn't too dusty, like the Home Depot stuff, you still walk away completely covered is grey glue. When I put a metal roof on my house it's not going to be black! Also on the menu for this weekend is to install three lights in the attic with a switch So I can see what I'm doing when I air seal it to the hit in the summer. Beats the hell outta carrying a drop light around.
__________________
My project:


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Chipping away on a daily basis.

Quote:
You know you're an ecorenovator if anything worth insulating is worth superinsulating.
Quote:
S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"

Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
S-F is offline   Reply With Quote
Old 03-22-12, 06:46 PM   #30
Xringer
Lex Parsimoniae
 
Xringer's Avatar
 
Join Date: Feb 2009
Location: Woburn, MA
Posts: 4,856
Thanks: 105
Thanked 242 Times in 223 Posts
Default

It's almost 8PM and my attic is still 91 deg F.
Musta been cooking up there this afternoon!

__________________
My hobby is installing & trying to repair mini-splits
EPA 608 Type 1 Technician Certification ~ 5 lbs or less..
Xringer is offline   Reply With Quote
Reply


Tags
cooling, paint, roof

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 06:39 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Ad Management by RedTyger
Inactive Reminders By Icora Web Design