Minimum roof slope for adequate roof venting. CA zone 4B
Hi, new to GBA. Was hoping to get some advice.
Located in CA, zone 4B. Can I get away with 2/12 pitch on single sloped roof using fiberglass insulation with 1.5″ air gap between insulation and sheathing with vents placed top and bottom of roof under eaves? If not, how about 2.5/12? What does building code require?
Read somewhere 3/12 is preferred, but doesn’t fit our clearstory home design very well. Any suggestions would be greatly appreciated.
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