Wood Siding Clearances
Wood trim and siding should always be installed with an air gap when installed at a roof, ground or concrete contact area. Flashing is typically used to make the connection between the two.
Roof Areas
Trim that extends down to a roof such as on dormer sidewalls and decks require a minimum of a 1 to 2 inch gap to avoid moisture wicking into the end grain.
Ground Contact Areas
Trim, such as water table or skirt boards must be a minimum of 6 inches but better to be 18″ above the ground. Remember in both situations to prime the end grain before installation.
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