Originally Posted By: pk richardson
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i am new here and have a question for the experts. i recently looked at a house that was around 50 years old and had the ashphalt shingles and all decking replaced 1 year ago. the decking was plywood. i noticed in several areas averaging about 1-2 foot in diameter that the decking was “bubbling up” for lack of a better term. i confirmed this from the attic as well, sorry i have no pics to offer. Georgia Pacific says it is because the roofer did not space the sheets of plywood when applying allowing for expansion of the sheets. the roofer says that the plywood seemed “green” when he applyed it. and that he has never spaced decking when applying it and never had this happen before. this might seem obvious to many of you but have you seen this happen before or could shed any light on it for my education. thanks