Drywall Tools-Sheetrock Tools-Tapetech Drywall Tools! - Question: How do you interface roof shingles with a stone wall made with highly irregular stone shapes?

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How do you interface roof shingles with a stone wall made with highly irregular stone shapes?
I have found several articles on the internet about roofing and how if you have a wall with stone veneer there are metal flashing products that fit in the mortar lines, lay vertically along the stone, and then pass under the roof shingles. What is done when large, irregularly shaped, real stones are used in a stone wall (think slipformed riprap or similar) that is higher than the roofline? How do you keep water from leaking between the wall and the roof?
Do It Yourself (DIY) - 3 Answers - 2008-03-02 10:12:08

Best Answer
Caulk is a bad answer. You will need some type of flashing that will allow some molding to the rock in addtion to removing some of the grout (mortar) between the stones and then repointing (reinstalling the mortar between the stones. Another option, depending on your particular circumstance, may be to get an abrasive blade for a skil saw and score a straight line in the stone about 6" above the roof line. You would then insert the edge of the flashing in this groove, bend it to fit tight against the stone, bend it again at the roof deck where your shingles are, and then caulk or put mortar in the groove. If this doesn't work, you may need to grind or chip the stone to make an area flat enough to apply the flashing. Copper can be used, I have seen lead sheets used too.

All Answers
Answer 1
caulk?
2008-03-02 10:21:45

Answer 2
Caulk is a bad answer. You will need some type of flashing that will allow some molding to the rock in addtion to removing some of the grout (mortar) between the stones and then repointing (reinstalling the mortar between the stones. Another option, depending on your particular circumstance, may be to get an abrasive blade for a skil saw and score a straight line in the stone about 6" above the roof line. You would then insert the edge of the flashing in this groove, bend it to fit tight against the stone, bend it again at the roof deck where your shingles are, and then caulk or put mortar in the groove. If this doesn't work, you may need to grind or chip the stone to make an area flat enough to apply the flashing. Copper can be used, I have seen lead sheets used too.
2008-03-02 10:31:44

Answer 3
one piece of aluminum step flashing for every shingle that buts to the stone wall. Starting at the bottom of the roof section and overlapping the shingles as you go up. The step flashing size can be anywhere from 8'' by 8'' or larger if your using stock and making your own. If the stone is too irregular to flash uniformly then maybe you can consider chiseling a smoother run along the wall...then counter flash with more aluminum over the step flashing by nailing another flashing over the step flashing using mortar nails and nailing into the grout joints. Then you caulk the top of the counter flashing. This situation is hard to describe with just text and not using photos.....I understand your situation and dealt with it before. Just very hard to describe in words. You need to make the smoothest surface possible to flash a stone wall, and it must be step flashed if you want to guarantee water will not breach your wall. You can request my email if my answer helps at all, I will gladly try to provide further assistance. I have other ideas that may help if you can provide photos.
2008-03-04 08:26:51