Flashing Under Cedar Siding

Flashing must be overlapped by the moisture barrier.

Flashing under cedar siding.

Otherwise it is possible for water to wick up the shingles and into the wall. Natural siding boards are designed to expand and contract with the elements and we do not want any adhesive to prevent their natural movement. Before installing siding make sure that flashings are installed to prevent moisture from entering wall and roof spaces. Step flashings on a cedar shake roof are typically installed every 10 inches.

If the kick out and step flashing can t tuck behind the siding screw on cap flashing to cover it then caulk along the top. Flashing intercepts and directs the flow of water away from the building to designed drainage paths. 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.

Keep water out of your home and running down the roof where it belongs with appropriate use of step flashing. We only caulk butt joints on cedar siding if previously caulked. Flashing should be made from a non corrosive material and should extend a minimum of 2 vertically up the wall. Cedar shingle siding must never rest on the horizontal surface of flashing.

Failing to replace step flashings when a cedar shake roof is replaced with a composition shingle roof. 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. Fiber cement boards are caulked only when there is no metal flashing behind them. Step flashing is used where a roof meets a.

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. 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. You do have to trim the top starter course shingle with a triangle shaped cut to allow this. 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.

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. The top of the step flashing is still under the siding or plaster.