Workshop Insulation?

lazy-river · January 22, 2007, 07:21:40 PM

Hello All,

Thinking about insulating my 12x16 two story with 1 inch celotex(foil on both sides) on the inside. the building is a timber frame, with board and batton siding. right now, my inside walls are the one inch hemlock siding that I nailed from the outside.
I can get a 1/2 price deal on the celotex, so I was considering this route. will this give me any r value? any potentail for moisture getting trapped? any other ideas?(felt paper?)

thanks for the forum.

oakiemac · January 22, 2007, 08:27:57 PM

I'm interested in ideas as well. I'm about ready to start insulating my new pole built building.

Furby · January 22, 2007, 09:42:22 PM

My experience with the yellowish foil covered foam is a few years old, but it don't hold up well and did absorb water.
I belive of the top of my head the R value is around 3, but not exactly sure.
I know the pink or blue expanded foam has an R value of 5 for 1" and hold up good if not in direct sunlight and even then holds up pretty good.

oakiemac · January 22, 2007, 10:07:00 PM

Yeah that blue foam boards are good and hold up well but they are expensive especially to insulate a whole bldg.

Furby · January 22, 2007, 10:33:49 PM

I'm sitting in the addition with 2" of foam and R-13 batts in the walls.
WELL worth every penny if it's going to be heated!

Qweaver · January 23, 2007, 01:05:59 AM

Find a business that custom cuts the foam from large blocks. I'm buying from a fairly small supplier near Chillicothe, Ohio for less than half of what it would cost to buy it from a box store. It is not foil backed but that can be easily done if desired.
Quinton

Don P · January 23, 2007, 08:53:42 AM

Also compare the R values of what's available to you. I was thinking the polyiso had a higher R than XPS and less loss over time ???

Raider Bill · January 31, 2007, 12:31:13 PM

I used heavy duty aluminum foil from the grocery store and a million staples on my shop roof, dropped my temp 20 degrees min in the summer time heat. Should work the other way too.

beenthere · January 31, 2007, 12:52:19 PM

Raider
Where was the aluminum foil stapled onto the roof? Over or under the rafters? Any backing used, like sheathing or drywall?

Raider Bill · January 31, 2007, 01:12:31 PM

I stapled it using rolls of the plastic package strapping from harbor freight to the inside rafters and down the middle of the decking. Not a tight fit so air can get in there. We noticed a huge differance immediatlly!