Cedar Siding Corner Flashing

Outside aluminum siding corners in different sizes.

Cedar siding corner flashing.

Thickness of the corner board will depend on the thickness of the siding. Corner boards are applied to the sheathing with siding fitting tightly against the narrow edge of the boards allowing for expansion and an adequate caulking bead. These pieces are used to protect the wood that is exposed after lap siding has been installed. Flashing must be overlapped by the moisture barrier.

Width is a matter of taste and proper proportion. These siding corners provide both stability and protection while giving a seamless look to hardboard siding. 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. Cedar shingle siding must never rest on the horizontal surface of flashing.

This aluminum trim is a great choice for siding corners lightweight yet durable. The most common are 3 4 inch or 1 1 4 inches thick. Use overlapping 1x4s or 1x6s at outside corners or use 5 4 stock for a heavier look. Building siding flashing finish details for building corners.

This aluminum corner is for hardboard siding measuring up to 1 2 thick. Flashing should be made from a non corrosive material and should extend a minimum of 2 vertically up the wall. Face width 1 3 4 per side at the bottom tapering to 1 1 4 at the top. Siding corner is primed white and has a wood grain surface.

The 122 series corners are also available in copper or stainless steel by special order only and available in a wide variety of lengths and flange widths to cover most styles of wood siding. The base of this outside siding corner is 1 11 16 wide from center to outside edge.