wrote:
I've seen siding put on in houses in my subdivision.

They pull off the siding. Then I have seen then tack up a shiney board
(not technicial terms - looks like it comes in 4x8 sheets). Then tyvex
wrap the house and put on new siding.

What is that shiney board they put on?

Probably foil faced rigid foam insulation.

From: http://doityourself.com/insulate/foa...insulation.htm

"...
Polyurethane and polyisocyanurate are both closed-cell foams that contain
a low-conductivity gas in the cells (usually one of the HCFC or CFC
gases.) The high thermal resistance of the gas gives these foams an
R-value of between R-7 and R-8 per inch.
....
Foil and plastic facings on these foam panels help to slow the escape of
gas from the cell structure. Testing suggests that the stabilized R-value
of rigid foam with metal foil facings remains unchanged after 10 years.
The reflective foil, if installed correctly, can also act as a radiant
barrier (another type of insulation) that adds about R-2 to the insulating
assembly. Panels with foil facings have stabilized R-values of 7.1 to 8.7
per inch.
...."



John
--
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