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Subject Author Date
Radiant Barrier tanyalew 07-28-2006
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Posted by on July 28, 2006, 1:23 pm
Just started looking into radiant barrier for the attic (I live in
Texas!). Has anyone had this installed, does it work and have you
noticed a difference?


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Posted by SJF on July 28, 2006, 2:49 pm

> Just started looking into radiant barrier for the attic (I live in
> Texas!). Has anyone had this installed, does it work and have you
> noticed a difference?


Where the heat flow is downward as from a hot roof to a room ceiling below
(mainly by radiation) they can be pretty helpful. Good for hot summer
conditions. In the winter, when heat flow is upward (mainly by convection)
they are questionable.

I once had good results laying kitchen style foil wrap between the rafters
in the attic above a bedroom. The bedtime ceiling temperature was very
noticeably reduced and the room was much more tolerable without air
conditioning.

SJF



Posted by Darrell Dorsey on July 28, 2006, 4:01 pm
I just put some in my attic the other day. I used Radiosity 3000 mixed in 5
gallons of semigloss paint. I needed 10 gallons total. The dealer sold me
two buckets of mis-Tint paint for $15 each. The Radiosity was $80 per pail
and I needed 2 pails, 1 per 5 gallons. Pretty easy to mix up. Plus I
rented a sprayer for $60.

Over all the job was fairly easy, but it was very hot in the attic even
though it was cloudy and rained the entire day. Spraying worked very well
after I learned how to set the airless sprayer. I've never used one before.
It was a very messy job. I was covered from head to toe in paint. If you
do the job yourself, wear eye protection and a respirator.

So far we've had some cloudy days in Houston this week. Today is the first
sunny day. I'll see this afternoon if it works any better.

I was planning to do the job in the spring or winter when it was cooler. We
put it off until last week when I got the eclectic bill and it seemed that
the upstairs AC unit would run all evening and night before it would get
cool.

Darrell

> Just started looking into radiant barrier for the attic (I live in
> Texas!). Has anyone had this installed, does it work and have you
> noticed a difference?
>



Posted by stevie on July 28, 2006, 4:58 pm
will installation of a radian barrier harm the shingles (supposedly by
making them hotter)?

seems like i may have heard this in the past, but not sure.
Just started looking into radiant barrier for the attic (I live in
Texas!). Has anyone had this installed, does it work and have you
noticed a difference?



Posted by Darrell Dorsey on July 28, 2006, 11:40 pm

> will installation of a radian barrier harm the shingles (supposedly by
> making them hotter)?

My understanding is no. As there is nothing to trap the reflected heat.
Where as it is trapped in your attic. Similar to a heat trapped in a closed
up car.

Here is the product that I used: http://www.radiosity.biz/

The faq: http://www.radiosity.biz/FAQs.html



>
> seems like i may have heard this in the past, but not sure.
> Just started looking into radiant barrier for the attic (I live in
> Texas!). Has anyone had this installed, does it work and have you
> noticed a difference?
>
>



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