Foam behind fiber cement siding technically you can do up to an inch.
Foam board under fiber cement siding.
Addition to my house.
Fiber cement insulated vinyl.
It gives another element that wants to be fiber cement or another rot resistant material.
I ve become a big fan of utilizing outsulation on all my houses over the last 2 3 years.
In a typical situation.
February 13 2013 exteriors insulation air sealing siding.
We show z flashing below the first course of siding and we show perforated board.
I m an architect in wisconsin climate zone 6b and am planning to build a 300 s f.
But if you use wood clapboard siding foam sheathing can cause trouble.
According to my calculations if i want to use rigid foam insulation on the outside of the 2x6 walls with r 21 fiberglass in the wall cavities i need at least r 11 25 in order to avoid condensation on the inside.
Almost any type of siding can be installed over the rigid foam cedar or redwood planks exterior plywood sheets cement fiber board or vinyl siding are common options.
Alot of guys do not favor any insulation under fiber cement though.
Perhaps a few pro s on this board could elaborate as to the main reasons why.