Installation Guide

EXTERIOR NEW WALL CONSTRUCTION
6
Single Coursing
Double the starting course at the base of the
wall (Figure 6). For Number 1 Grade
Certi-label Western Red Cedar shingles apply
with 1/8” to 1/4” keyway space and for
Number 1 Grade Yellow Cedar shingles,
apply with 1/4” to 3/8” keyway space
between the Certi-label shingles, giving a
pronounced individual effect to each course.
Offset the side joints in any one course at
least 1 1/2" over joints in adjacent courses
(Figure 2).
Use a straight edge, nailing it lightly to the
wall with the edge at the butt line (to keep
courses straight and level). Check for level
every 3 or 4 courses.
This wall application features concealed
nailing (Figure 6), with nails driven
approximately 1" above the butt line of the
succeeding course. For Certi-label Western
Cedar shingles up to 10" wide, place two
nails in each shingle 3/4” from each edge.
With Certi-label Western Cedar shingles
wider than 10", drive two additional nails
approximately 1" apart near the center.
Because Certi-label Western Cedar shingles
vary in width there should be little waste. At
corners, or at door or window frames, you
may have to trim a selected Certi-label
Western Cedar shingle slightly.
Plywood panel
or dimensional
lumber sheathing
Architect: Shope Reno Wharton, Photo: Robert Benson
The CSSB recommends installing over
plywood panel or dimensional lumber
sheathing. If other sheathing materials are
approved for use by your local building
official, the holding power of the fasteners
should also be considered carefully.
The outer course is applied 1/2" lower
than the inner course as a drip course
to help shed water
Enlarged to
show detail
(Figure 6)
Figure 6: Single Coursing
*The Cedar Bureau recommends that underlayment shall be No. 30 felt
conforming to ASTM D226 Type II or ASTM D4869 Type IV. Check with
your local building official for any questions about alternative
underlayment materials.
Undercoursing grade shingles
Concealed nailing
The outer course is applied 1/2" lower
than the inner course as a drip course
to help shed water
Plywood panel
or dimensional
lumber sheathing
Note: All figures depict shingle
applications. DO NOT interlay shingles or
shakes with felt on sidewall applications.
Underlayment shall
be No. 30 felt
conforming to
ASTM D226 Type II
or ASTM D4869
Type IV.
Underlayment
shall be No. 30 felt
conforming to
ASTM D226 Type II
or ASTM D4869
Type IV.