Building Design and Construction Handbook - Merritt - Ventech!

WOOD CONSTRUCTION 10.65
TABLE 10.38 Recommended Minimum Edge and End Distances and
Spacing for Wood Screws, Nails, and Spikes
Wood side members
Not prebored Prebored
Edge distance
End distance:
2.5d 2.5d
For tension load parallel to grain 15d 10d
For compression load parallel to grain
Spacing (pitch) between fasteners in a row:
10d 5d
Parallel to grain 15d 10d
Perpendicular to grain
Spacing (gage) between rows of fasteners:
10d 5d
In-line 5d 3d
Staggered 2.5d 2.5d
Steel side members
Not prebored Prebored
Edge distance
End distance:
2.5d 2.5d
For tension load parallel to grain 10d 5d
For compression load parallel to grain
Spacing (pitch) between fasteners in a row:
5d 3d
Parallel to grain 10d 5d
Perpendicular to grain
Spacing (gage) between rows of fasteners:
5d 2.5d
In-line 3d 2.5d
Staggered 2.5d 2.5d
* d � shank diameter.
such wood as oak, with a specific gravity of 0.6 or more, and of 70% of the root
diameter in such wood as Douglas Fir and Larch, with a specific gravity between
0.5 and 0.6. For wood screws subjected to lateral loads, holes receiving the shanks
in wood with a specific gravity of 0.6 or more should have the same diameter as
the shank. Holes for the threaded portion should have a diameter about equal to
the root diameter of the screws. For screws in less dense wood, the part of the hole
for the shank should be about seven-eighths the diameter of the shank. Holes for
the threaded portion should have a diameter about seven-eighths the root diameter.
Soap or other lubricant may be used to facilitate insertion and to prevent damage
to the screw.
Screws are designated by gage (diameter) of shank and overall length. For design
purposes, it is adequate to assume two-thirds of the screw length is threaded.
10.19 NAILS AND SPIKES
The ‘‘National Design Specification for Wood Construction’’ (NDS) provides design
values and design provisions for nails, spikes, box nails, and threaded, hardened-