Roll Roofing Edge Leak
Hi, I have a frustrating problem that I would appreciate some help with. I am a carpenter (not a roofer) who installed a 70 ft. long porch on a beach house (my house). It is L-shaped in plan with a hip in the corner and the roof is 7 ft. 8 in. wide (by 70 ft, long). To maintain the height I tapered the top of the rafters so there is a 3/4" to the foot slope and installed the porch roof just under the existing soffit. The bottom of the rafters are flat and suppport a vinyl ceiling.
I went to a professional roofing supplier and bought a heavy white roll roofing material, don't remember what it was called. It came with a second roll of lighter material (much heavier than 15# felt but lighter than the roofing. And a 5 gal bucket of cement. I installed alum edging all the way around and nailed the lighter material down to the deck per instructions. I then spread the cement onto the lighter materialand glued down the heavy roofing. All went well.
In time water began wicking around the bottom edge of the roofing and getting the edge of the plywood, the rafter tails, and the fascia, in spots along the entie run, wet. The water apprears to somehow roll right around the edge. Only the first couple of inches gets wet, but that is too much.
I went up and glued on a 6 in. strip of roofing along the edge on top of the existing roof, leaving more overhang. But water continues to get around the edge. It is in maybe a half dozen spots now.
Something I noticed is: On the back of the house I left more overhang than I did on the side. I pretty much lined up the roofing with the edge of the edging on the side, but on the back let it overhang close to 2 in. There is no problem back there, but it doesn't look too attractive.
I want to fix it for good. I bought more roofing. I want to repair it without removing the entire roof. I am thinking of cutting the roofing about 6 in. below the first seam (about 36 in) and nailing down new roofing base material, installing new edging, then regluing the heavy top layer, leaving a 6 in overlap onto the older roofing material and a 1 1/2" overhang at the drip edge.
Any advice from anyone? I would like to do this once.