It looks like I'm going to have to pull the old T1-11 off the south side of
the house due to delamination. While I'm torn down to the insulation is
there a material that would use the same space as the old fiberglass
insulation (1973 construction)? The southern exposure causes the room to
heat up badly in the summer. I'm thinking a closed cell foam or a spray on.
Or, isn't it worth it?

"C & E" wrote:

It looks like I'm going to have to pull the old T1-11 off the south side of
the house due to delamination. While I'm torn down to the insulation is
there a material that would use the same space as the old fiberglass
insulation (1973 construction)? The southern exposure causes the room to
heat up badly in the summer. I'm thinking a closed cell foam or a spray on.
Or, isn't it worth it?


You have to do the numbers for your area to say whether it's worth it or not.
Closed cell foam does have slightly higher R values than open cell, but
eventally there will be a leak and open cell is purportedly better for passing
the water through when closed cell will hold it in the wall where it will cause
mold and rot.

Also - R value is not the primary consideration. You might also consider a
hybrid approach - better economics. Spray a small layer of foam for the sealing
properties and use unfaced fiberglass to fill the cavity.

On Apr 8, 10:45�pm, Robert Neville wrote:
"C & E" wrote:

It looks like I'm going to have to pull the old T1-11 off the south side of
the house due to delamination. �While I'm torn down to the insulation is
there a material that would use the same space as the old fiberglass
insulation (1973 construction)? �The southern exposure causes the room to
heat up badly in the summer. I'm thinking a closed cell foam or a spray on.
Or, isn't it worth it?

You have to do the numbers for your area to say whether it's worth it or not.
Closed cell foam does have slightly higher R values than open cell, but
eventally there will be a leak and open cell is purportedly better for passing
the water through when closed cell will hold it in the wall where it will cause
mold and rot.

Also - R value is not the primary consideration. You might also consider a
hybrid approach - better economics. Spray a small layer of foam for the sealing
properties and use unfaced fiberglass to fill the cavity.

sprayed closed cell foam is likely twice the R value as old
fiberglass.

Foam R6 or R7...... plus it seals all the cracks etc.

you could fill the cavatiys with foam and add a layer of foam over the
entire wall too for even better efficency

thats pretty common when people reside here

On Apr 8, 10:27*pm, "C & E" wrote:
It looks like I'm going to have to pull the old T1-11 off the south side of
the house due to delamination. *While I'm torn down to the insulation is
there a material that would use the same space as the old fiberglass
insulation (1973 construction)? *The southern exposure causes the room to
heat up badly in the summer. I'm thinking a closed cell foam or a spray on.

On Apr 8, 9:27*pm, "C & E" wrote:
It looks like I'm going to have to pull the old T1-11 off the south side of
the house due to delamination. *While I'm torn down to the insulation is
there a material that would use the same space as the old fiberglass
insulation (1973 construction)? *The southern exposure causes the room to
heat up badly in the summer. I'm thinking a closed cell foam or a spray on.

C & E wrote:
It looks like I'm going to have to pull the old T1-11 off the south side
of the house due to delamination. While I'm torn down to the insulation
is there a material that would use the same space as the old fiberglass
insulation (1973 construction)? The southern exposure causes the room
to heat up badly in the summer. I'm thinking a closed cell foam or a
spray on. Or, isn't it worth it?

Wet sprayed in place cellulose is the best way to go. Will stop air
infiltration and it fits all irregular spaces around wiring, plumbing
etc. Even having it drilled and filled after the siding goes on will
work also.

s