Installation Guide

14
GENERAL WALL DESIGN
DETAILS
Cedar shakes and shingles’ beautiful appearance,
superior insulative value, adaptability to diverse design
forms, and low maintenance make them the Natural
Choice for exterior and interior wall applications.
Exterior Walls
Prepare the walls by removing or pounding nails or
protruding objects flush. Solid sheathing or spaced
battens are recommended for wall installation. Apply
BS747:4016/5250/5534 breathable felt paper,
overlapping 50mm horizontally, 150mm vertically, and
100mm around inside and outside corners. Metal
flashing installed over the paper at the inside corners
protects the felt paper from tearing.
Next, the installation of vertical corner boards
eliminates the requirements of mitering and lacing at
outside and inside corners. Western Red Cedar boards
of 19 x 100mm, and 19 x 81mm, nailed together form
outside corner units. Square boards of 38 x 38mm are
nailed to the inside corners. Mitering and lacing details
are pictured for optional installation information.
Silicon Bronze annular ring nails or stainless steel nails
31mm x 1.8mm for shingles, and 50mm x 2mm for
shakes are recommended. Apply two nails only per
shingle or shake, 25mm above the exposure line and
25mm in from the sides. Double the first course at the
base of the wall, on a line 25mm below the top of the
foundation. The outer course is applied 12mm lower
than the inner course as a drip course to help shed
water. As the wall is already covered with felt paper, no
further interlayment of felt paper is required for
shingles or shakes. Wall exposure for shingles and
shakes should be no more than 40% of their length, to
provide full coverage in the spaces between them. The
use of a straight edge board nailed lightly to the wall
with the top edge at the butt line, keeps courses
straight and level. Shingles and shakes will expand and
contract slightly once installed, and should be spaced a
few millimetres apart to accommodate.
Interior Walls
Shingles and shakes may be fastened onto nailable
surfaces such as plywood or battens. Calculate the
number of rows from floor to ceiling, based on the
exposure of no more than 40% of the shingle or shake
length. Minor exposure adjustment may be made to
achieve equal length exposure at the top course. Install
the battens according to the exposure, with the batten
centre at the nailing point of 25mm above the
exposure distance. Double the first course to conceal
the wall. A straight edge tacked to the wall will keep
the courses straight and the exposure consistent. Glue
or use finishing nails for the top course. Alternately
overlap at the outside corner to give a laced effect, then
trim flush with a block plane. Install a western red
cedar 38mm x 38mm batten at inside corners for ease
of application. Alternately, trim to lace alternate
courses into the corners.
Lap
E
38mm
6mm
Shingles butted against square
wood strip on inside corner,
Flashing behind
Laced outside corners
Laced inside corner with
Flashing behind
Shingles butted against corner
boards