Installation Guide

ManualsBrandsUnbranded ManualsDimensional Lumber5/4 in. x 4 in. x 8 ft. Premium Tight Knot Cedar Lumber

8. OUTSIDE AND INSIDE CORNERS

There are two main methods used for outside

corners. The choice depends primarily on the

desired appearance but also the experience and

skill of the installer.

Mitered corners offer a professional looking

nish. They are most commonly used with

horizontally applied siding applications such

as bevel. Mitered corners require good

carpentry skills. They must t tightly for the full

depth of the miter.

Corner boards are a popular and easier alternative to mitered corners. Thickness of the corner board will depend

on the thickness of the siding. The most common are nominal one inch or nominal 5⁄4” thick. Width is a matter

of taste and proper proportion. Corner boards are applied to the sheathing with siding tting tightly against the

narrow edge of the boards, allowing for expansion and an adequate caulking bead. The corner boards and the

ends of the siding are nailed to the corner studs, which anchor the wood for a maintenance-free joint. Designing

roofs with an eaves overhang to protect corners from weathering also helps ensure trouble-free joints. Always

apply primer or stain to end cuts. With corner boards, there is the choice of applying them next to the siding or

over top of the siding as shown here.

As in the above illustration, at inside corners, siding is frequently butted against a 2 x 2 trim strip. It can also be

butted against adjoining walls with a trim strip used to cover the joint.

9. FIELD JOINTS

When butt jointing siding, cut ends at 45 degree angles to form an overlapping joint. This is particularly important

for vertical installation. Ensure joints meet on studs, blocking or furring strips with the nail penetrating solid

wood at least 1¼”.

INSTALLATION

WESTERN RED CEDAR

SIDING

(B) Corners boards

Cedar siding

Sheathing

Corner boards

Provide additional stud to allow for

nailing at ends of siding

Caulk

joints

Cedar siding

Sheathing

Corner boards

Provide additional stud to allow for

nailing at ends of siding

Caulk

joints

Trim

Cedar siding

(A) Mitered Corners

Sheathing

House wrap

(eg. Tyvek® DrainWrap™)

House wrap

(eg. Tyvek® DrainWrap™)

House wrap

(eg. Tyvek® DrainWrap™)