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Cedar Shingles & Shakes
Shingles
John Brash is one of the country's leading importers and distributors of Western Red Cedar Shingles, and is the sole importer of Handsplit Cedar Shakes. It holds extensive stocks of both Shingles and Shakes, together with Fancy Butt (profiled) Shingles, hip and ridge cappings, silicon bronze nails and shingling axes.
Cedar Shingles are supplied by the bundle either untreated or Pressure Treated Exterior fire retardant treated depending on the circumstances. They are sawn to length but are in random widths. The most widely used shingle is the XXXXX (5X), which is 16" long (400mm). Only one grade is available - No.1 Grade Blue Label Certigrade.
1. Estimating.
 Shingles can be applied at a variety of gauges, however there are 3 standard gauges:
a) Roofs 14º - 22º- shingles applied at a 95mm gauge = 1.73m² per bundle
b) Roofs 23º + - shingles applied at a 125mm gauge = 2.28m² per bundle
c) Vertical - shingles applied at a 190mm gauge = 3.47m² per bundle
N.B. These are exact areas and do not allow for cutting and wastage.
In addition for all cases allow extra for the following:
i.) Double Starter Course - 1 bundle for every 18 lin.m
ii.) Valleys - 1 bundle for every 7.5 lin.m.
iii.) Hips & Ridges** - 1 bundle for every 7.5 lin.m (traditional method)
**Alternatively hip and ridge cappings may be used. These are 450mm long, consisting of two shingles stapled together. These are generally fixed at the same gauge as the roof:
 14° - 22° 1 bundle @ 95mm gauge covers 3.42 lin.m.
23º + 1 bundle @ 125mm gauge covers 4.50 lin.m.
In both cases hips and ridges are started with a double starter course then appplied with an alternate overlap.
2. Nails.
Silicon Bronze - 31mm x 1.80mm annular ring
- 45mm x 2.36mm annular ring
Typically 4 bundles of shingles require 0.707kg of nails (31mm x 1.80mm) but the longer nails are required for the hip & ridge cappings.
3. Fixing Method
Fixing Specification 147° - 21°° pitch
 The shingles should be fixed at 95mm gauge giving a coverage of 1.73 sq/m per bundle net.
A double course of shingles should be used as a starter course at the eave and an allowance of 1 bundle for every 18 lin/m run should be included. The shingles should project at least 38mm beyond the eave protection or if a gutter is used at least to the centre line of the gutter.
The shingles shall be spaced 5mm apart and be nailed twice, the nails should be fixed 19mm in from the edge and 38mm above the butt of the course above.
Joints in any one course should have a side lap of not less than 38mm from the joint in adjacent courses and in any 3 courses no 2 joints should align.
Hips & Ridges may be formed on site by hand or alternatively a pre-formed hip & ridge capping may be used. A binder should be used beneath each capping piece. Each bundle covers 4.5 lin/m and consists of 18 left hand and 18 right hand pieces.
Valleys should be code 5 lead or as specified and should be at least 375mm in width and should be coated with patination oil or bituminous paint where contact is made with the shingles. The shingles should lap the lead by not less than 178mm on each side.
 Flashings shall be in accordance with good building practice and should be coated with patination oil or bituminous paint where contact is made with the shingles.
Ventilation should be at eave level and a Roll Vent ridge ventilator is available from John Brash & Co Ltd.
Fixing Specification 22° Pitch & Above
The shingles should be fixed at 125mm gauge giving a coverage of 2.28 sq/m per bundle net.
A double course of shingles should be used as a starter course at the eave and an allowance of 1 bundle for every 18 lin/m run should be included. The shingles should project at least 38mm beyond the eave protection or if a gutter is used at least to the centre line of the gutter.
The shingles shall be spaced 5mm apart and be nailed twice, the nails should be fixed 19mm in from the edge and 38mm above the butt of the course above.
Joints in any one course should have a side lap of not less than 38mm from the joint in adjacent courses and in any 3 courses no 2 joints should align.
Hips & Ridges may be formed on site by hand or alternatively a pre-formed hip & ridge capping may be used. A binder should be used beneath each capping piece. Each bundle covers 4.5 lin/m and consists of 18 left hand and 18 right hand pieces.
Valleys should be code 5 lead or as specified and should be at least 375mm in width and should be coated with patination oil or bituminous paint where contact is made with the shingles. The shingles should lap the lead by not less than 178mm on each side.
Flashings shall be in accordance with good building practice and should be coated with patination oil or bituminous paint where contact is made with the shingles.
Ventilation should be at eave level and a Roll Vent ridge ventilator is available from John Brash & Co Ltd.
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