Caulking For Chimney Flashing

Put a layer on the edge of each piece of flashing.

Caulking for chimney flashing.

Once each piece of flashing is as secure as it can be apply the silicone caulk. You can t use too much so get as much as you can in there. Loctite pl s30 polyurethane roof and flashing sealant is a premium quality commercial grade sealant developed especially for forming permanent water and weatherproof seals in all exterior gaps and joints. Seal the problem seams with roofing caulk using a standard caulk application technique.

Installing a roof plumbing vent is typically an easier task than flashing a chimney. Place the step flashing over the caulk and onto the chimney. This sealant is elastic and remains flexible to expand and contract with construction material movement to protect and retain the original. In the second layer more sheet metal is inserted into the chimney mortar joints and folded over to cover the first layer.

Fit an 8 inch 20 3 cm piece of square step flashing over the chimney s front corner. Polyurethane has a tendency to break down and has lifespan at best half that of silicone. Effective roof flashing around a chimney includes two layers. Install shingles as normal up to the base of the plumbing vent.

Here is how you do it. You want to squeeze it into all the nooks and crannies you can. One laying involves tightly playing sheet metal around the chimney edges. While polyurethane does have its strengths related to its fairly low price silicone is by far the superior choice when choosing a chimney sealer.

You don t have to make it look nice you just need to fully fill the gap. Place the flashing or boot onto the plumbing vent so the base is resting on shingles. Like any other caulking job you want to push the bead not pull it. Silicone is an inorganic substance that has high toughness against temperature fluctuations and uv rays.

Getting the right sealant on your flashing is the best bet. Momentarily lift the boot and apply sealant to hold the flashing in.