Hello, I am new here and looking for some experienced help. My garage has a flat roof that serves as our homes main level deck (the house is built on a slope). Unfortunately some water found its way through a section close to an edge of the garage roof and has completely saturated a section of plywood. I know this because my drywall was sagging and dripping with water when it rained. Today I cut (Drywall) a sizable square section out of the roof of the garage and exposed the black and rotted wood underneath. Not very exciting! Tonight I started pulling up the decking, around the section that was leaking, and found the culprit…a small sagging section of shingles. I am assuming water started pooling up and found its way in. My deck has long cross beams that lay under the main decking boards and to get them off I would literally have to take all of the decking completely off...this is a big problem/challenge for me.

Here is my question. Can I spray the effected area with an appropriate bleach/water mixture, let it dry, layer it from the inside of the garage with new plywood, and then brace it (lifting the sag) with cut 2 x 4’s? If done correctly, I should be able to make the rood line flat again. At that point I can lay out new tar and roofing shingles, securing any leaky spots. Fixed leak and no more sag, right?

Does this sound like a workable solution? I am concerned with the amount of time and money it will take to completely pull up all my decking, tear out all the current (effected) shingles, drop in new plywood, etc. Being that the garage doesn’t even have an access point to the main house entry, and it’s typically used for a gym…I don’t feel the need to go all out and reconstruct the roof! Do I? I am no expert at this, I am trying to find the quickest, most cost effective way to seal up the troubles area and simply illuminate the leak.

I would love some food for thought on the direction I am headed here. What materials I could layer the old saggy plywood and new plywood with, what to put over the shingles to make sure they aren’t leaking, etc.

Thanks,


CM

Pictures would help tremendously.
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I don't need no freakin' signature, I Am Roofer.

Are you saying the flat roof is shingled?
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selfemployedslave wrote:

Are you saying the flat roof is shingled?

I'm hoping by "shingles" the person either means Mod. Bit. or 90# roll roofing, since both can have granules like a shingle. Otherwise, I'm stumped and the only advice I can give is to replace the shingles on the flat roof with material intended for use on a flat roof.
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Professional Roofing & Waterproofing Consultant

I am sorry...yes it is a roll of "shingle like" material.