CEDAR SHINGLES
APPLICATIONS DETAILS
Profile
A light easy to handle shingle in a rough sawn finish.
Characteristics
Certigrade, red cedar shingles, No 1 Blue label, 100% heartwood, 100% clear and 100% edge grain. Can be CCA treated. Shingles are strapped in bundles each covering approx 2.2m/sq depending on the pitch.
Fixings
Each shingle is fixed with marine grade stainless steel staples at least 32mm long. Stables are placed approx 19mm to 25mm from the side edges of the shingles and 38mm to 50mm above the butt line of the course.
SHINGLE APPLICATION
Regardless of style, the following basic application details must be observed.
1. Shingle must be double at all eaves.
2. Butts of first course shingles should project 38mm beyond the facia.
3. Spacing between adjacent shingles (joints) should be a minimum of 6mm and a maximum of 9mm.
4. Joints in any one course should be separated not less than 38mm from joints in adjacent courses; and in any three courses, no two joints should be in direct alignment.
5. Flat grain shingles wider than 300mm should be split in two before nailing. Knots and similar defects should be treated as the edge of the shingle and the joint in the course above placed 38mm from the edge of the defect.
Pitch
Maximum weatherexposure using 455mm shingle on pitches over 19 degree 140mm. For pitches between 15 degrees up to 19 degrees maximum exposure is to be 105mm. On roofs below 19 degrees a 450mm wide strip of roofing felt or underlay should be laid between each course.
Battens
50mm x 25mm batten spaced to suit roof pitch.
| Grade | 1:4 to 1: Pitch | 1:3 and Steeper Pitch |
| 400mm 450mm 600mm | 400mm 450mm 600mm | |
| No 1 Blue Label | 95mm 105mm 145mm | 125mm 140mm 190mm |
| No 2 Red Label | 90mm 100mm 140mm | 100mm 115mm 165mm |
| No 3 Black Label | 75mm 90mm 125mm | 90mm 100mm 140mm |
Underlay
Use self supproting flame stop roofing underlay. Underlay is fixed under the battens.
The minimum roof pitch for Western Red Cedar shingles is 1 in 4
Flashings
All flashings to be butynol. Where step flashings are used they extend horizontally not less than 75mm up the vertical wall and shall be lapped by the flashig above by at least 100mm, and extend 250mm under the shingle. All valleys flashings to extend at less 150mm on each side.
Maximum Exposure for Shingle on Exterior Walls
|
Maximum Exposure |
|
Length and Grade |
Single Course |
Double Course |
400mm No 1 Blue Label |
190mm |
305mm |
450mm No 1 Blue Label |
215mm |
355mm |
600mm No 1 Blue Label |
290mm |
405mm |