Shed Roof Problem

by John Varcoe
(Cornwall, England )

Boards used for shed roof

Boards used for shed roof

I have recently discovered rot in the roof of the log cabin in our garden which is used as an office. I think the pitched roof is constructed with sterling board - well it is a large-chipped board. The boards are covered with a thin black membrane (which I was told was waterproof) and strips of self-sticking felt roofing shingles. The builder botched his work with the shingles and did not fix two overlapped layers on the bottom rows. He fixed only one layer and I have now found that the sterling board is rotting underneath the gaps in the shingle strips along the full length of both edges. Wood lice are under the shingles which are eating through the black membrane.

The pitch of the roof is 24 degrees. I will be doing the repair work myself and need to keep costs down. Depending on your advice, I will either replace the rotten areas with sterling board or replace all of the ten sterling boards (size 8' x 4' x 3/4'') on the pitched roof.

Could you please advise on the best materials for this job. Should I use better quality 8 x 4 boards such as WPB external plywood or marine ply?


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