Moisture Content:
Wood shrinks and swells with changes in moisture content.  To minimize dimensional change after installation, install siding at moisture content which matches the local climate as closely as possible.  If climate in a particular reigon causes wood to maintain 8% to 13% moisture content annually, then the most ideal siding would be installed at a moisture content within that range, and the material would be stored, stickered and protected for a week to ten days prior to application (acclimatization).  Ask your supplier for the specific application instruction sheets as needed.

Often material which has been properly seasoned, stored and handled, will pick up moisture after installation and prior to painting.  Later, when the siding releases its moisture, joints may open up or buckling may occur.  Priming or prefinishing all sides, edges, and ends AFTER it has reached climactic balance and BEFORE it is installed, provides extra protection and is mandatory when siding is to be finished or installed over foam or foil-faced sheathings.  Prefinishing can also minimize objectionable unfinished lines where joints open up due to face width shrinkage.

Nail Shanks:
Many nails have smooth shanks and will loosen under extremes in temperature.  Obtain increased holding power by using ring or spiral-threaded nail shanks.  Both types of shanks are readily available.

The folowing requirements are essential for nails used on wood siding.

Recommended Nails:
The folowing are recommended nails for use on wood siding.

Nail Penetration and Spacing
Suggested sizes are minimal and should be longer when siding is installed over other than wood sheathing and/or studs.  Recommended penetration into studs, studs and wood sheathing combined, or blocking is 1-1/2" or 1-1/4" with ring shank nails.  Vertical siding should be nailed to horizontal blocking or other wood framing members not exceeding 36" on center when face-nailed. (Some building codes require 24" maximum.)  Horizontal siding should be nailed to studs at 24" on center maximum when applied over solid sheathing and 16" on center maximum when applied without sheathing.

Nail Points
The most commonly used nails points include:

NOTE: All siding must be re-end trimmed on both ends.  Cut a 45 degree angle to yield a good end match joint prior to installation.

45 Degree Angle Cut - End View Matching Joint - Side View


Plain Bevel

may be used with smooth
faced exposed or sawn face
exposed to textured effect.
Recommend 1" minimum
overlap on plain bevel siding.
Horizontal application only.

Dolly Varden

is thicker than Bevel Siding.
Rabbeted edge.  Horizontal
application only.  Widths 8"
and over use two nails 3"-4"
apart, as shown in Channel

Tongue & Groove

Tongue & Groove is available
in smooth or rough surface.
Use single finish nail as
shown for 6" widths or less.
Wider widths, face nail twice
per bearing.

Channel Rustic

has 1/2" lap and 1" to 1-1/4"
channel when installed.
Widths 8" and over use two
nails 3"-4" apart