Latest Discussions : HVAC

richierennie

04:29AM | 01/22/04
Member Since: 01/21/04
2 lifetime posts
HOW MUCH R VALE IS ADDED WHITH THE HOUSE RAP AND THE FOAM BOARD INSULATION WHEN DOING VINYLE SIDING?

Piffin

05:24PM | 01/25/04
Member Since: 11/06/02
1278 lifetime posts
Almost none. It functions primarily as a draft stop. If you eliminate drafts, an old house can feel warmer but there is almost no R value to be considered.

For comparison, most foam panels for sheathing application are worth R3.5 to 7.2 per inch of thickness. So your foam for vinyl might average R-1

devildog

07:17AM | 01/29/04
Member Since: 09/16/02
250 lifetime posts
Piffin, are you saying it's a waste of time? I would think it's a cheap investment to stop the drafts as you say. And since richierennie is going to redo the outside shouldn't he do this as well?

Devildog

Piffin

12:12PM | 02/01/04
Member Since: 11/06/02
1278 lifetime posts
It should be done for several reasons. stopping draft is one of them. Supporting the shape of the siding is another. providing a barrier against moisture is another.

but insulation value is a pure bonus for what little it is. If I were doing it for insulation value, I would be more likely to add an inch or 1/2" of foil faced foam instead of or in addition to the meager piece included with the siding.

it doesn't hurt a thiung but there isbn't much to count on for R-Value.



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