No stupid questions...scarfing insulation

[Juneaudave]

Got a wild hair tonight and started putting in spars...true 1 inch x 1 inch spars with 1 inch pink Foamular (12 inch centers)... the insulation so far is really tight, but I have to press pretty hard to bend it around around the curve...

Do most people scarf the insulation? Or will the strap clamps (when I get some) pull it tight enough I won't have to scarf? Oh yeah...geez...a fella is in Alaska and only using 1 inch insulation...go figure...

[ha]

Dave, dont worry about the insulation. If it makes you feel better, we are in fairbanks and arent putting any in ours!

[Steve_Cox]

Dave,

I didn't scarf the pink foam, although it sounds like a good idea. I did use Smacna tape to join the pieces and to seal it in to complete the moisture barrier. I might have over done it...

[Sonetpro]

In the radius I used a straight edge and a razor. I scored it half the thickness every 2". It made it easy to lay in.

[Miriam C.]

Scarfed mine every 2 inches on the bad curves. Used the table saw with a thin kerf blade. Careful cause it will shoot out if you don't hold it just right and melt if you send it through too slow.

[Dee Bee]

I didn't scarf mine. I used a thinner product, then layered it. I found that holding the edges down with brads really helped me form the pink stuff to the roof shape.



Dee Bee

[Dee Bee]

I didn't scarf mine. I used a thinner product, then layered it. I found that holding the edges down with brads really helped me form the pink stuff to the roof shape.



By the way I am glad I insulated ceiling and walls. I have never had any condensation problems, insulation is the cure of damp inside walls.

Dee Bee

[tonyj]

I had to kerf the insulation on the curved sections because it was 1-1/2 inches thick and wouldn't bend. The picture shows a test piece, the actual had half as many kerfs in it.

[Steve Frederick]

I did two layers@ 3/4" each.
I kerfed the backs..


Spring clamps and scrap wood hold the first layer..


To hold the second layer, use scraps of 1/4" ply, screwed to the roof spars..


In the bottom pic, of the Stripper, in progress, I used a foil faced Styrofoam
product..very flexible. I use only pink or blue foam now.

[Juneaudave]

That seems to be doing the trick...a few scarf cuts and temporary scrap pieces screwed into the spars. Much easier to work with. I've been wondering if that 1 inch foam would bend without scarfing.