| B. Roof Sheathing 1.Panel roof sheathing shall be (specify
appropriate grade):
APA RATED SHEATHING EXP1
APA RATED SHEATHING EXT
APA RATED SHEATHING/CEILING DECK EXP 1
APA STRUCTURAL I RATED SHEATHING EXP 1, or
APA STRUCTURAL I RATED SHEATHING EXT.
Sheathing permanently exposed to weather shall be classed
Exterior.(5)
Install with the long dimension or strength axis of
the panel across supports, except where noted(8), and with panel continuous
over two or more spans. for pitched roofs, place screened surface or side with
skid-resistant coating up if OSB panels are used. Wear skid-resistant shoes when
installing roof sheathing and keep roof deck free of dirt, debris and sawdust during
constructions. Suitable edge support shall provided where indicated on drawings
(or in recommendations of APA)(6) by use of panel Clips, tongue-and-groove
edges, or lumber blocking between joists. Panel end joints shall occur over framing.
Spacing of 1/8" is recommended at all panel
ends and edges, unless otherwise indicated by the panel manufacture.(9)
Nail 6" o.c. long supported panel edges and 12"
o.c. at intermediate supports, except that when supports are spaced 48" o.c. at all
supports. Use 8d common nails, except that when panels are 1-1/8", use
ring-shank or 10d common.(10)(11)(12)
Cover roof sheathing as soon as possible with roofing felt
or shingle underlayment for protection against excessive moisture prior to roofing
applications.
C. Floors
1. Subflooring (under structural finish floor
such as wood strip or underlayment)- Panel subflooring shall be (specify
appropriate grade):
APA RATED SHEATHING EXP1
APA RATED SHEATHING EXT
APA STRUCTURAL I RATED SHEATHING EXP 1, or
APA STRUCTURAL I RATED SHEATING EXT
Install with the long dimension or strength axis of
the panel across supports and with panel continuous over two or more spans. Panel
end joints shall occur over framing. Spacing of 1/8" is recommended at panel
ends and edges, unless otherwise indicated by the panel manufacturer.(9)
Nail 6" o.c. along supported panel edges and 12"
o.c. at intermediate supports with 6d common nails for panel 1/2" or less, 8d for
greater thickness. Where panels are 1-1/8" thick and supports are 48" o.c.,
nails shall be 8d ring-shank or 10d common and spaced 6" o.c. at all supports (10)(11)(12)
| Notes to Specifiers: (1) The APA trademarks shown here are typical examples only. Refer to the
following sections for specific panel grade and thickness recommendations.
(2) Structural I grade (all plies limited to Group 1
species) can be specified when greater stiffness or strength is required.
(3)Thickness recommendations are contained in APA
Design/Construction Guide: Concrete Forming, Form V345.
(4)Exposure 1 may be specified for applications where
prolonged but temporary exposure to the weather will be required.
(5)Open soffits or roof sheathing exposed on the underside
may be any panel classed Exposure 1 where appearance is not a major consideration.
(6) Refer to the appropriate application recommendations in
this brochure.
(7) References to APA's recommendations may allow
subsequent specification concerning nailing, edge support and panel orientation to be
omitted.
(8) Long dimension of panel may be parallel to supports if
panel has adequate thickness. See table 27 for roof panels applied
parallel to supports.
(9) Supported panel joints shall occur approximately along
the centerline of framing with a minimum bearing of 1/2".
(10) Engineered shear wall and diaphragms may require
additional nailing. See recommendations in Tables 23 and 32. Diagonal bracing is not required for braced wall sections when
panel wall sheathing, APA RATED WALL BRACING or panel siding (APA RATED SIDING) is used.
(11) Other code-approved fasteners may be used.
(12) Fasteners shall be located a minimum 3/8" from
panel edges.
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