Flashing Between Chimney And Siding

First step flashing must be installed before the siding so that the siding can cover the top of the flashing.

Flashing between chimney and siding.

Where the step flashing terminates along a sidewall is a common trouble spot for moisture problems. The nails should be inch from the outer edge of the flashing and 16 inches apart. With the flashing in place let s see what happens. Attach the flashing to the face of the wall with 6 penny galvanized nails and a hammer.

Metal flashing or any metal to wood joint should not be caulked another water exit pathway that should never be sealed. However my question is more about the water proofing of the joint between the chimney and the wall. Also avoid caulking tongue and groove siding boards together. 08 09 2015 12 51 pm 7.

The best solution is a preformed or custom bent kick out flashing to divert the water away from the siding. The nails holding up the siding should not be caulked. Second step flashing needs to extend 8 to 14 inches above the shingles according to the national roofing contractors association nrca. Improper siding and flashing details can lead to siding failure even with hardie plank.

Wall flashing where siding meets a chimney clean out the gap use backer cord for large gaps and seal with good quality butyl caulk in clear colour. The water then runs off the flashing because it can t go up the flashing as it extends up behind the siding. Run the l shaped flashing up under the bottom row of siding so that it tucks under the final bottom row and on top of the wall and on top of the last row of bricks before you cap it with the cap. The water runs down the siding and at the bottom of the first row of vinyl siding it drips off and contacts the metal flashing as it runs across the top of the fascia board.

If this is a repair job the siding must also be removed and replaced with the flashing. Otherwise dripping water will leave its mark along the siding. Flashing vinyl siding next to vertical side of chimney.