Page 125 - 2018 National Home Improvement

2018 National Home Improvement Estimator, All Rights Reserved Page 102

Maximum Exposure for Shingles
Double Double
Coursing Coursing
Single No. 1 No. 2
Material Length Coursing grade grade
Shingles 16" 7-1/2" 12" 10"
18" 8-1/2" 14" 11"
24" 11-1/2" 16" 14"
Shakes (handsplit and resawn) 18" 8-1/2" 14" --
24" 11-1/2" 20" --
32" 15" -- --
Exposure distances for wood shingles and shakes on sidewalls
Figure 6-14

Whether single-course or double-course, all joints should be staggered. Vertical joints of the upper
shingle should be at least 1-1/2” from any joint in the lower shingle.

Use rust-resistant, anti-stain nails when installing shingles. Two nails are enough on shingles up to 8”
wide. Use three nails on shingles over 8” wide. For single-coursing, 3d or 4d shingle nails are best. Nails
with small flat heads are best for double-coursing because the nail heads are exposed. Use 5d nails for
the top course and 3d or 4d nails on the lower course. When plywood sheathing is less than 3/4” thick,
use threaded nails for increased holding power. Keep nails at least 3/4” from the shingle edge. When
single-coursing, keep nails 1” above the horizontal butt line of the next higher course. See Figure 6-12.
When double-coursing, nails should be 2” above the bottom butt.