Installation Guide

ROOF PROJECTION FLASHING DETAILS
Recommend construction details for applying metal flashings around typical roof
projections such as chimneys and vent pipes (Figure 13).
For roofs and walls, the use of
stainless steel, phosphor, or silicone
bronze nails is recommended.
Standard shingle nails are 31mm x
1.8mm stainless steel annular ring
shanked.
Standard shake nails are 50mm x
2mm stainless steel annular ring
shanked.
Nails shall be driven flush but not
so that the nail head crushes the
wood. They shall be placed
approximately 19mm to 25mm
from the edges of the shingles or
shakes and 38mm to 50mm above
the butt line of the following
course. Each shingle or shake shall
be secured with two nails.
75mm minimum
150mm minimum
Nick with
hatchet to stop
water beading
Caulking
Typical chimney flashing
not requiring soldering
Step flashing 75mm
minimum overlap
Caulking
Apron flashing
Head flashing
Typical chimney flashing
requiring soldering
Solder joints
150mm
75mm
150m
m
Building paper
Plywood
Step flashing
Dormer flashing
Mastic underlap
Corner flashing
l
25mm minimum clearance
around projection
Nails should not
penetrate flashing
flange underneath
Keep edge of flange
minimum 50mm from
edge of shingle joint
Typical Projection
Flashing
Shingle joint
Counter flashing
Jack
Plumbing stack
100mm
50mm
Fig. 13: Flashing Details for Typical Roof Projections
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