• 17
  • Mar
  • Let me better ask this question. I am looking for a material I can use to seal the bottom of the valley on my roof where water is running down then sideways and getting in between where my covered porch meets the side of my house. There is no flashing, just interwoven shingles. Can I just use a roofing cement or some form of tar?


  • roof cement will work as a temp fix. you need to strip the area in the valley. use ice and water shield and 90 lb rolled roofing then shingle


  • Any tar you put on it will be a temporary fix, lasting maybe a few months. You could try a rubberized roofing solution, but I don't feel that would last very long either.

    1. You need to cut back the shingles at least 2-3 inches on each side. Box cutters or a knife can be used for this.

    2. Next go to a roofing supply store and purchase a metal valley. This can be either galvanized (silver color) or painted to match the shingles.

    3. Lift the shingles up and slide the valley under it, then fasten the valley with nails that are under the shingles.

    4. Depending on the type of shingle you may need to use an adhesive under them to hold them down at the edge where it meets the valley.


  • I always try to fix a problem in the best manner and pulling off the shingles and installing flashing and perhaps ice and water shield would be my choice.


  • Since the shingles are interlaced, anything you put on top will not prevent moisture from moving beneath the shingles.

    Really, the only solution to insure proper drainage is to remove shingles back to allow a minimum of 24" wide flashing material to be laid into the valley.

    If you stack your shingles in 2 piles, you should be able to put them back in the same order, without needing any new ones.


    Good luck...



  • Yes any roofing tar product will stick and seal. Is there any way you can post a pic. Not even a photo just a top down look at the roof. That would help with other ideas.







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