Over time shiplap fir wood resin dissipates causing the boards to shrink crack form knot holes and become extremely brittle.
Shiplap roof sheathing.
Today a shiplap roof is usually 60 years old.
The house is 45 years old and the roof looks very decent.
If you have roofers that don t know the difference between shiplap skip sheathing find a roofer that does.
Until the advent of plywood shiplap boards were commonly used to construct the sheathing between a home s structural framing and its exterior siding.
This produces a surface with changes in elevation equal to the thickness of the boards it is unacceptable as a roof deck because it is uneven.
Sometimes on older houses they have had so many different roofs that the deck is all shot up splintering in this case a redeck is in order.
Shiplap is siding laid so that the lower edge of each board rides over the top of the previous board.
They may make a few extra bucks but they also want to leave a quality job behind.
Shiplap roof decking was widely used in the 50 through 80 s era when plywood hadn t yet made its way into new construction.
And don t think that the roofing company is going to make a mint off sheathing your roof.
The rules for nails are fasteners must penetrate through the roof deck or be embedded 3 4.
Roof is 1 layer of 3 tab asphalt shingles that are in need of replacement it will be a full year off.
After the 1960s the predominant residential roofing substrate became 1 2 cdx plywood.
Nowadays people often find shiplap sheathing.
Sharp roofing is seattle s roof repair and replacement experts.
Being ideal for asphalt shingles in the early days of its creation shiplap sits beneath the roof of many homes about thirty years old.
The old shingles were the 3 tab interlock shingles.
Open spaces form between the once tightly fitted shiplap boards.
There is probably about a gap on average.
The boards are not butted tightly.
Shiplap doesn t have any gaps in the boards and can be roofed over as is usually.
Shiplap is now considered an enemy of asphalt shingles.
10723 exeter ave ne seattle wa 98125.
The contractor has indicated to the owner that its okay to put the asphalt shingles on the shiplap and that it won t void the warranty on the shingles.
I m hearing talk that if i tear off the existing shingles i am required to re sheath the roof with 7 16 osb while i m at it.
So anytime your board decked roof is torn off and you want to install composition shingles be sure to lay down solid sheathing first.
The house is 1950s construction with 1x8 rabbeted shiplap boards as the roof sheathing.
Call us today for a free estimate or roof inspection 206 367 7663 or fill out our contact form here.
Apart from some very minor repairs at the eaves the shiplap is in great condition.
