There
are several different types of decking materials that can be
used to support your surface roof. However, the type of surface
roofing you choose can determine if a solid sheathing, or open
slat system and board dimensions of the decking will be
required.
Tongue
and Groove—helps to prevent both buckles and bows.
Staggered
Seams—creates a more stable roof. Don't line up the
sheathing sheets right above the other. Stagger them by
starting every other row with a 4x4 sheet rather than a full
4x8 sheet.
Sheathing
Thickness—will depend upon the type of sheathing
used, however it is "Wise" to
Type
of Material Used—Plywood, Wafer Board, or Particle
Board. Through the knowledge and experience that I have
gained, the best is tongue and groove plywood—especially
if ever there is ever a leak. Other materials may weaken, or
even disintegrate in a very short time when wet.
Moisture
Prevention—Once the sheathing is installed, it is
imperative that roofing felt be applied over it right away to
prevent the sheathing from getting wet. When sheathing gets
wet, it can warp, bow, and buckle.
Open
Slats: Roof materials such as: wood
shakes, metal, tile, and others may suggest using slats rather
than solid sheathing as a roof deck . The dimensions of the
slats to be used depend upon both the area building codes and
the specifications required by the product manufacturer.
When
wood shakes are installed directly over sheathing moisture
problems can occur...
...Wood
Shakes need to "breathe" and if they are not allowed,
moisture can build up and cause your roof to rot. Please refer
to the manufacturer's recommended guidelines for installation
techniques.
For
an example go to:
http://www.ci.long-beach.ca.us/plan/helphome/NewShingleShake.html
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Solid
Sheathing: Usually comes in 4' x 8'
Sheets
