Shingles Blowing off of Decking

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March 15, 2023 at 7:44 p.m.


Steve from GA asked:

New roof was put on 3 years ago. The decking is 1x6 slats, not solid decking. Shingles are blowing off because decking is not solid, according to roofing company. House is 50 years old. Why did none of original roof blow off? Original roof was installed on the same 1x6 decking that new roof was installed on.

March 15, 2023 at 7:51 p.m.

John Kenney from Cotney Consulting Group says:


Without having any additional information on the condition of the wood planks, below is the information I can offer.
Manufacturers' requirements for that type of wood plank to be roofed over are: Nominal   1" thick x 6" wide wood planking, with a maximum 1/8" spacing at the ends and sides   
I will assume the shingles are correctly sealed, which is not the cause of the blow-off. If that is the case, then more than likely, the nails missed the deck in spots and went between the plank gaps (Larger than 1/8", which is common on older decks that shrink), which is causing the blow-off. Unfortunately, there is no quick fix for this if that is the situation.

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