Technical Specifications

a
EXTERIOR NEW WALL CONSTRUCTION
Figure 8: Corner Option Details
c) Mitered corner
d) Laced inside corner with flashing behind inside
strip on corner
e) Alternated laced outside corner
b
cd
e
8
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 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 Type 30 felt
underlayment at these corners.
1 x 4
1 x 3
a) Certi-label Western Cedar shingles butted against
corner boards
b) Certi-label Western Cedar shingles butted against
square wood strip, flashing behind
Figure 9: Fitting Laced Corner Courses