ROOF DECKING APPLICATION RECOMMENDATIONS
Fig. 1
To avoid double handling, panels of Homasote Roof Decking
should be unloaded from truck directly to the roof, wherever
possible. They should be set on roof framing at approximate
points of use. All panels should be handled carefully to avoid
damage to finished side, edges and ends. They should be
protected from elements prior to application. (See Page 1 )
Fig. 2
Avoid waste and irregular joints by measuring roof area and
planning layout in advance. For example, rip the starter course to
provide equal width courses at ridge (top course) and eaves
(bottom course) rather than wide at bottom and narrow at top or
vice versa. Always keep length of panel at right angle to framing
members.
Fig. 3
Where wood beams are to be exposed and stained or painted,
mask top of beam with wide strip of waxed paper or polyethylene
held down by staples. This avoids marring of roof deck finish.
After painting, slit waxed paper flush along beam and remove.
Fig. 4
Homasote Roof Decking saws easily and cleanly with either a
hand saw or power saw. If hand saw is used, keep finished side
up; for power sawing, finished side should be down and handled
carefully to protect against scraping and soiling.
ALL BUTT JOINTS MUST FALL
ON FRAMING MEMBERS |
Fig. 5
Starting at low or outside edge of roof, lay the first course of
panels along the entire roof edge. Tongue should face ridge.
Check course for straightness. Nail with galvanized Common
Nails as follows: for 1 " thick panel, use 6d nails; for 1-3/8" thick
panel, use 8d nails; for 1-7/8" thick panel, use 10d nails; for 2-3/8"
thick panel, use 16d nails. Use 5 nails per rafter, 4-1/2" o.c. and
back 3-3/4" " from edges. Work from center of panel to ends.
Fig. 6
First course should be laid completely along the roof edge. Follow
with next courses having end joints staggered. Bring long edges
together into a snug fit by hammering a block of wood against the
top edge of panels, before nailing. Ends and tongue and groove
joints should be sealed against penetration of indoor air and
moisture by applying a bead of caulking compound, leave 1/8"
gap at butt joints.
PANEL ENDS MUST NOT PROJECT
BEYOND FRAMING AT ROOF EDGES. IF
DECKING IS USED AS OVERHANG, IT
MUST BE SUPPORTED AT ALL
OUTSIDE EDGES AND/OR ENDS WITH
ADDITIONAL FRAMING MEMBERS. |
Fig. 7
Around chimneys and other projections cut roof decking same as
for wood construction following local code requirements Prime
and caulk cut edges. Fill space between roof deck and chimneys
or other projections with approved insulation. Finish with flashing
and collar as in regular procedure
Fig. 8
If NATURAL decking is to be used as exposed exterior
overhang, apply good quality exterior paint to the exposed
underside exactly as with wood. If a soffit is used and overhang is
boxed, space between rafters should be vented. Caulk, as
needed, against possible moisture penetration. If VINYL
SURFACED DECKING is used it is not necessary to paint
exposed surface
