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Radiant Barrier Success Stories
Posted on 7/4/23 at 10:51 am
Posted on 7/4/23 at 10:51 am
Anybody install radiant barrier in their attic after building? Wish i had done it on my roof decking but too late now. House is 5 years old with very little shade. Have young trees but will be a few years before they are useful.
Looking at possibly stapling up radiant barrier across rafters in attic. At least on west facing roofline which is a big portion of roof.
Looking at possibly stapling up radiant barrier across rafters in attic. At least on west facing roofline which is a big portion of roof.
6
Posted on 7/4/23 at 11:16 am to Zakatak
I did it worth it. Low cost
Posted on 7/4/23 at 11:25 am to Zakatak
Also dumb question for any that know. I have a pretty tall and steep pitched roof. How does one gain access to taller sections of interior roofline? Im assuming decking and a ladder or scaffolding? I will likely hire it out but just curious.
Also, would it be worth it to insulate the ceiling over my patio and garage? Builder cheaped out on that but not sure if it would help given its not conditioned space below.
Also, would it be worth it to insulate the ceiling over my patio and garage? Builder cheaped out on that but not sure if it would help given its not conditioned space below.
This post was edited on 7/4/23 at 11:26 am
Posted on 7/4/23 at 11:30 am to Zakatak
I can put these under the roof decking in the attic..
Worth it?
Worth it?
Posted on 7/4/23 at 12:34 pm to East Coast Band
Its a roll of foil paper like barrier that you can staple to your rafters. I think the idea is to let your soffit vents intake air normally then it gets funneled under roof deck to exhaust vents in channels between rafters. In theory it seems like it really stops the radiant heat from penetrating your attic space and heat soaking your house. However there are a few people that say it degrades the life of a shingle roof. But im leaning more and more to that being a non factor for me in south louisiana given that wind and storms will damage shingles before the designed life of a shingle is reached.
I dont know thats why i started the thread. Haha
quote:
Worth it?
I dont know thats why i started the thread. Haha
Posted on 7/4/23 at 12:48 pm to Zakatak
quote:
Also, would it be worth it to insulate the ceiling over my patio and garage? Builder cheaped out on that but not sure if it would help given its not conditioned space below.
Builder didn’t cheap out on you, at least not on this, this is standard building practice - there is no need to insulate over unconditioned areas - porches, carports, garages, etc. So no - it wouldn’t help. “Heat chases Cold” 2nd Law of Thermodynamics - heat will move by conduction from the hot attic to the cooler areas below, so I assume you would not want to curtail heat from a hot attic from moving to an unconditioned outside area by insulating above it.
Though I don’t have a radiant barrier yet, I’ve researched them, and as to higher pitched roof areas, from what I gather the barrier doesn’t need to go up all the way up to the higher roof line, it can be placed horizontally over the lower elevation ceiling rafters (bottom chord of the roof trust) - if that makes sense. I don’t know how an installer would approach this.
This post was edited on 7/4/23 at 12:59 pm
Posted on 7/4/23 at 4:28 pm to Zakatak
Just did it. Go horizontal across rafters. Leaves the gap you need. Big difference. In garage as I type this.
Posted on 7/4/23 at 5:56 pm to Zakatak
Been a few threads recently on this and yes, it helps greatly IMO.
Posted on 7/5/23 at 7:16 am to Shoalwater Cat
quote:
Just did it.
Would you mind giving a rough estimate on cost per sqft?
Posted on 7/5/23 at 8:43 am to Shoalwater Cat
quote:
Just did it. Go horizontal across rafters. Leaves the gap you need. Big difference. In garage as I type this.
Got any pictures of the finished product?
Posted on 7/5/23 at 9:53 am to Zappas Stache
Just used google to pull up a previous thread from June in case anyone is interested. Good info there as well. Its a link to Tigerdroppings.
LINK
LINK
Posted on 7/5/23 at 11:33 am to CrawDude
[quote there is no need to insulate over unconditioned areas - porches, carports, garages, etc. So no - it wouldn’t help.[/quote]
I agree with you that its not typical practice. But I do think that it would help mitigate heat radiating from the the roof/attic. If this was not the case then unconditioned metal buildings would never be insulated.
I took (and somehow passed) thermo years ago in college but I cant say I remember enough to be useful here.
I agree with you that its not typical practice. But I do think that it would help mitigate heat radiating from the the roof/attic. If this was not the case then unconditioned metal buildings would never be insulated.
I took (and somehow passed) thermo years ago in college but I cant say I remember enough to be useful here.
Posted on 7/6/23 at 10:43 am to Zakatak
quote:
I agree with you that its not typical practice. But I do think that it would help mitigate heat radiating from the the roof/attic. If this was not the case then unconditioned metal buildings would never be insulated.
Well yes it would do that, that’s the purpose of insulation, but I have to believe you would not mind hot air from your your attic moving outside into areas you are not living.
Of course if one uses a garage for example as work area/space for hobbies etc, even if not air conditioned, I could see someone insulating the attic overhead to help moderate temperature below. Don’t really know if it would assist in anyway with an outdoor porch.
Insultating metal building, even if not air conditioned, makes sense if a person uses it to work in, or to moderate extremes in temperature when storing lawn chemical etc., plus it helps with moderating dewpoint temperature and minimizing condensation “sweating” of the metal which of course leads to rusting.
By the way, I thought the same as you when my house was built, though several years after the fact, and I asked some engineers I knew well at LSU, and who were friends of mine about this. Both were working on large federal grants associated with improving energy efficiency in homes - they quickly educated me on thermodynamics/heat transfer and why the areas in an attic over unconditioned areas were not insulated. lol
This post was edited on 7/6/23 at 4:09 pm
Posted on 7/6/23 at 3:54 pm to Zakatak
20 x 20 Garage..Hip roof. $400 +-
Posted on 7/6/23 at 3:55 pm to tunechi
Nope...Try to remember to take some and post
Posted on 7/7/23 at 8:18 am to tunechi
See the "Compelling video link" below. Spot on.
Posted on 7/7/23 at 12:05 pm to CrawDude
quote:
Don’t really know if it would assist in anyway with an outdoor porch.
I am hoping that it will for a few reasons. My patio is surrounded on 3 walls by my house so it lacks some natural airflow. My patio faces the west so the setting sun is brutal in Summer. I have recently screened off my patio using 70% Solar screen with a 24" knee wall. Also ported the knee wall for a dual hose AC unit to see if I can lower the temp a few degrees to make it comfortable.
We will see if it is worth it. The screen definitely helps with the direct sunlight/heat.
Posted on 7/7/23 at 12:09 pm to Zakatak
quote:
I am hoping that it will for a few reasons. My patio is surrounded on 3 walls by my house so it lacks some natural airflow. My patio faces the west so the setting sun is brutal in Summer. I have recently screened off my patio using 70% Solar screen with a 24" knee wall. Also ported the knee wall for a dual hose AC unit to see if I can lower the temp a few degrees to make it comfortable. We will see if it is worth it. The screen definitely helps with the direct sunlight/heat.
Well that makes perfect sense to insulate the porch area attic in that case.
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