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robertwhiting76AThotmail.com
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I'll send drawing to patch or renew. Also if you can send a picture of the damage area and one of the whole roof so I can see if it's a pent roof [single slope], or pitched.. [slope each side.]
cheap repair.
Repair: cut the damaged area square get roll of thin felt, Using a straight edge at the top edge of the repar square facing the gap looking UP the roof cut a 3-4inch slit either side to so you can slide the repair patch under the felt above it. Cut the patch 6 to 8inches wider than gap and at least 12 inches longer [3 to 6 inches need to be slid up under top felt.
Once slid in place fold it back up the roof don't crease it and apply felt adhesive to the gap and over the felt either side working around the edges of the gap area so it seals the existing felt. pull over and flatten repari patch down onto the adhesive. Apply more adhesive to the two top slits to ensure they are sealed of. Job done patched. I did one it lasted for 6 yrs and never leaked in the patch area.
Bob
March 2011