Installation Guide

EXTERIOR NEW WALL CONSTRUCTION
Corners
Neatly fitting inside or outside corners are
easily made. It is standard practice to lace
outside corners (Figure 8e). On wide
exposures this method requires small nails
near the Certi-label Western Cedar shingle
butts to tighten and hold the lapped corners.
For these corners use only nails that are
corrosion resistant. In double course
applications, the exposed Certi-label Western
Cedar shingle or shake shall be face-nailed
with two hot-dipped galvanized or stainless
steel casing nails, driven 2” above the butt
line, and 3/4” from each edge. Certi-label
Western Cedar shingles wider than 10”
require 2 additional nails and these two nails
are driven approximately 1 inch apart near
the center of the shingle. Corner boards also
can be used to advantage by nailing a 1 x 4
cedar board to a 1 x 3 cedar board, then
attaching the preassembled corner to the
building (Figure 8a).
It is good practice to use flashing behind
Certi-label Western Cedar shingles or shakes
at the inside and outside corners. They may
be butted against a square wood strip
(Figure 8b), or they may be fitted one course
to the other (Figure 8d). When the latter
method is used, courses must be completed
on each wall progressively, and can be best
applied by working from the corners while
alternately fitting one course to the other.
(Figure 9)
It is preferred practice to install
inside/outside corner flashing to
safeguard against the cracking
or tearing of No. 30 felt
underlayment at these corners.
a) Certi-label Western Cedar shingles butted against
corner boards
b) Certi-label Western Cedar shingles butted against
square wood strip, flashing behind
c
1 x 4
1 x 3
Figure 8: Corner Option Details
c) Mitered corner
d) Laced inside corner with flashing behind inside
strip on corner
e) Alternated laced outside corner
8
Figure 9: Fitting Laced Corner Courses
a
b
d
e