Polystrene foam

Jhd128

I recently received a load of polystyrene foam fir free and I was wanting to install it on the ceiling in my attic to give some type of insulation bc there is nothing currently there. Is this a good idea? Do I need some type of vapor barrier ? I'm kind of lost on this one.

jburd964

I suppose these are the sheet of foam that your talking about. If so this sheets aren't that great of a insulator. Depending on your location as to the amount of saving it will get you. Seeing as it was free it's better then nothing. If it were me and I was going through the effort, which will be a lot to install sheet insulation in a attic, I would spend the amount that it would cost and blow in some Cellulose insulation. It's not my favorite insulator but cheap and easy of use in a attic.

Gary in WA

Where are you located?

What thickness and type/color foam board?

Is any HVAC in attic?

And, welcome to the forum!

Gary

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Jhd128

Thanks! I live in Dallas and it's Dow plazamate foam board. There is hvac in the attic and I know it's a little bit of work but u figured anything would be better than nothing for now.

Gary in WA

Here is a good one to get you started: http://www.buildingscience.com/docum...ditioned-space

Click on others at the bottom of page.

Another one; http://www.buildingscience.com/docum...on?full_view=1

And finally: http://www.joelstiburek.com/topten/south.htm

Gary

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