
The last "roofing" contractor they had came out and installed roof tape along this 40' long wall. It didn't fix the problem, though. We ended up having to remove the tape and shingles all along this wall (and 3 other walls) and repair the flashing underneath. Then we installed new shingles.

In this photo you can see that the gutters are full of water. Normally, commercial gutters are installed in sections and sealant is applied where the sections meet. The builder didn't do that here, though. Instead, the builder installed 3-4 layers of flashing tape inside the gutters. The problem with this was that as the tape aged, it became unsticky. Water then found its way underneath the tape and became trapped between the tape and the gutter. Because the water was trapped it wouldn't drain. Instead, it just leaked into the church. We spent 2 days removing tape from the gutters and then sealed the inside of the gutters with professional gutter sealant.

This flat roof was also leaking when we started. We installed roof patches (using hot asphalt) and solved the problem.
It would be easy for us to always recommend the absolute cheapest fix to a problem, but because we stand behind our work, we want to make sure the solutions we offer will actually solve the problem. Two days after we repaired the roof and gutters the Dallas area had a 4" rain. The church had only 1 leak. We returned to check it out and discovered that we had missed sealing one joint in one of the gutters. We took care of the issue, it's rained since then, and no other issues have been reported.
If you are having issues with your commercial building and need someone to give you actual solutions, call Rainy Day Services at (866) 596-2030.