Shiplap Roofing Boards

There are long wooden boards involved but genuine shiplap actually has overlapping grooves that fit together to make the design weather tight.

Shiplap roofing boards.

In fact most shingle manufacturers will not warranty a roof that is sitting directly on shiplap. Shiplap has a groove cut into the top and bottom which allows the boards to fit together and gives it a unique appearance. Set your store to see local availability add to cart. Shiplap is everywhere these days.

If the roofing underlayment is applied directly on top of the shiplap it will sag into the spaces and eventually leak. Roof is 1 layer of 3 tab asphalt shingles that are in need of replacement it will be a full year off. Shiplap is now considered an enemy of asphalt shingles. My house is from 1950.

While shiplap may look like plain run of the mill wood panels that s not the whole story. Moving and shifting shiplap is one of the major reasons why there is a problem laying shingles directly over this inferior roof decking. There is probably about a gap on average. Over time shiplap fir wood resin dissipates causing the boards to shrink crack form knot holes and become extremely brittle.

If you nail plain wooden boards to a wall and call it shiplap that s not quite accurate. Sheathing is 1x8 shiplap boards actual dimensions x7 with x rabbets. Simply put traditional shiplap is a kind of wooden board that is often used for building barns and sheds. Open spaces form between the once tightly fitted shiplap boards.