Fix leaks/cracks in fibreglass roofing simply with this straight forward Letsfixit guide. No matter what type of roof you have, leaks are almost certain to occur at some point. Leaks can be large or small, but either way, they need to be fixed properly to keep the inside of the home in good shape. Fixing leaks on a fiberglass roof is similar to fixing leaks on any other type of roof. The most important step to properly sealing a fiberglass roof that is leaking is finding the leaks. When this is accomplished, the rest of the job is manageable for many homeowners.
Find all the leaks on the inside of the house to determine how many and where they are on the outside. Go up into the attic where the leaks are entering the house and locate precisely where they are coming in. Look for stains on the underlayment of the roofing to determine where the leaks are entering the house.
Spread a bead of DAP watertight roof sealant caulk over the first crack and continue on by filling all of the cracks on the roof. Spread roof patch over the bigger cracks and holes with a trowel.