Question

most problems with exterior cladding involve air leakage heat loss vapor diffusion water penetration efflorescence question 23 fiber - cement siding has never contained asbestos is prone to rot is brittle is combustible is roughly 7/8 inch thick

Explanation:

Exterior cladding problems often stem from water penetration which can cause various issues like damage to the structure behind. Fiber - cement siding is known for being brittle. It historically could have contained asbestos, is resistant to rot, non - combustible, and not typically 7/8 inch thick.

Answer:

Question 1: water penetration
Question 2: is brittle