The boards are not butted tightly.
Shiplap roofing boards.
Shiplap is everywhere these days.
Open spaces form between the once tightly fitted shiplap boards.
Shiplap has a groove cut into the top and bottom which allows the boards to fit together and gives it a unique appearance.
In fact most shingle manufacturers will not warranty a roof that is sitting directly on shiplap.
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If you nail plain wooden boards to a wall and call it shiplap that s not quite accurate.
My house is from 1950.
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There is probably about a gap on average.
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.
There are long wooden boards involved but genuine shiplap actually has overlapping grooves that fit together to make the design weather tight.
Sheathing is 1x8 shiplap boards actual dimensions x7 with x rabbets.
X random lengths driftwood grey vintage shiplap.
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.