Flashing Under Cedar Siding

Otherwise it is possible for water to wick up the shingles and into the wall.

Flashing under cedar siding.

Put the bottom step flashing on the starter course then bend the bottom of the step flashing out about 1 to 1 away from the wall. Before installing siding make sure that flashings are installed to prevent moisture from entering wall and roof spaces. Flashing must be overlapped by the moisture barrier. Natural siding boards are designed to expand and contract with the elements and we do not want any adhesive to prevent their natural movement.

Step flashing is used where a roof meets a. Install the flashing before you finish the top of the brick wall as the flashing must go behind the siding as well as behind and under the top row of bricks that angle outward to cover the top. Flashing is an important line of defense in controlling moisture in wall assemblies. Add felt if needed before nailing the new wood on and prime the new wood on all.

Inspect the sidewall around and underneath the fascia and inside the house for signs of moisture damage and repair any rotted areas. Use a felt paper spline wrapped around the corner and extending 6 inches beyond the corner board to protect the joints where the siding meets the corner boards see figure 1 5 at left. You do have to trim the top starter course shingle with a triangle shaped cut to allow this. We only caulk butt joints on cedar siding if previously caulked.

A common problem with cement board siding products and some other types of horizontal lap siding is that older installation guidelines called for caulking the joint instead of flashing the joint. Flashing intercepts and directs the flow of water away from the building to designed drainage paths. Cedar shingle siding must never rest on the horizontal surface of flashing. Flashing should be made from a non corrosive material and should extend a minimum of 2 vertically up the wall.

The top of the step flashing is still under the siding or plaster. Building siding flashing finish details for building corners use overlapping 1x4s or 1x6s at outside corners or use 5 4 stock for a heavier look. Step flashings on a cedar shake roof are typically installed every 10 inches. This has proven problematic over time as caulking the joint results in unsightly surface appearances due to the different textures as well as resulted.

Fiber cement boards are caulked only when there is no metal flashing behind them. It is always recommended to install step flashing behind stucco dryvit wood panel lap siding vinyl siding cedar shingle siding etc. How to install step flashing under siding.