Place the step flashing over the caulk and onto the chimney.
Caulking for chimney flashing.
Like any other caulking job you want to push the bead not pull it.
While polyurethane does have its strengths related to its fairly low price silicone is by far the superior choice when choosing a chimney sealer.
Polyurethane has a tendency to break down and has lifespan at best half that of silicone.
Once each piece of flashing is as secure as it can be apply the silicone caulk.
Put a layer on the edge of each piece of flashing.
One laying involves tightly playing sheet metal around the chimney edges.
Installing a roof plumbing vent is typically an easier task than flashing a chimney.
Momentarily lift the boot and apply sealant to hold the flashing in.
Materials required 26 gauge galvanized sheet steel for prefabricated pieces drive in expanding anchors galvanized coil stock galvanized front base flashing galvanized step flashing polyurethane caulk self adhering roofing membrane ice and water barrier.
Set the flashing aside.
Getting the right sealant on your flashing is the best bet.
Place a small drop of caulk where the roof and chimney meet at the chimney corner.
Fit an 8 inch 20 3 cm piece of square step flashing over the chimney s front corner.
In the second layer more sheet metal is inserted into the chimney mortar joints and folded over to cover the first layer.
Place the flashing or boot onto the plumbing vent so the base is resting on shingles.
You can t use too much so get as much as you can in there.
Effective roof flashing around a chimney includes two layers.
This sealant is elastic and remains flexible to expand and contract with construction material movement to protect and retain the original.
You don t have to make it look nice you just need to fully fill the gap.
Here is how you do it.
Seal the problem seams with roofing caulk using a standard caulk application technique.
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.
