siding & rainscreen questions
I am in the middle of putting an addition on my house in central Virginia, and trying to decide what sort of siding to use. I have regrettably sheathed the structure with OSB rather than plywood, and I’m interested in taking care to ensure maximum drying potential, given what I’ve read on GBA about OSB’s inferior drying properties.
At this point, the OSB is covered with Typar, taped at the seams. I plan to put a rainscreen of some sort on top of the Typar to prevent sun-driven moisture from infiltrating the wall. I’m planning to use lapped siding, either cedar or fiber cement.
I have two questions regarding this choice:
– It seems to me that cedar would allow more water to penetrate than factory-painted fiber cement siding, but that cedar would also allow more water to escape. Are these assumptions correct? If so, which type of siding, if installed over a rainscreen and properly maintained, would lead to an overall drier wall assembly?
– Is there any advantage to manufactured rainscreens over furring strips other than ease of installation, and, in the case of fiber cement siding, the continuous nature of them that would provide a more supportive substrate than furring strips?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part