3.2.2
Contact with Wood
Where metal will be in contact with wood or other absorbent material
subject to wetting, seal joints with sealing compound and apply one coat of
heavy-bodied bituminous paint.
3.3
INSTALLATION
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NOTE: Include bracketed sentences where roof
coverings are applied directly to wood decks.
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Install in accordance with the approved manufacturer's erection
instructions, shop drawings, and diagrams. Panels shall be in full and
firm contact with attachment clips. Where prefinished panels are cut in
the field, or where any of the factory applied coverings or coatings are
abraded or damaged in handling or installation, they shall, after necessary
repairs have been made with material of the same color as the weather
coating, be approved before being installed. Seal completely openings
through panels. Correct defects or errors in the materials. Replace
materials which cannot be corrected in an approved manner with nondefective
materials. Provide molded closure strips where indicated and where
necessary to provide weathertight construction. Use shims as required to
ensure attachment clip line is true. Use a spacing gage at each row of
panels to ensure that panel width is not stretched or shortened. [Provide
one layer of asphalt-saturated felt placed perpendicular to roof slope,
covered by one layer of rosin-sized building paper placed parallel to roof
slope with side laps down slope and attached with roofing nails. Overlap
side and end laps 75 mm 3 inches, offset seams in building paper with seams
in felt.]
3.3.1
Roof Panels
Apply roofing panels with the standing seams parallel to the slope of the
roof. Provide roofing panels in longest practical lengths from ridge to
eaves (top to eaves on shed roofs), with no transverse joints except at the
junction of ventilators, curbs, skylights, chimneys, and similar openings.
Install flashing to assure positive water drainage away from roof
penetrations. Locate panel end laps such that fasteners do not engage
supports or otherwise restrain the longitudinal thermal movement of panels.
Form field-formed seam type system seams in the field with an automatic
mechanical seamer approved by the manufacturer. Attach panels to the
structure with concealed clips incorporated into panel seams. Clip
attachment shall allow roof to move independently of the structure, except
at fixed points as indicated.
[3.3.2
Insulation Installation
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NOTE: For applications where permeability is a
critical consideration, sealing of the insulation
joints or other methods of providing continuity of
the vapor retarder shall be specified. Overall roof
construction should be reviewed to assure
permeability is consistent with requirements
specified for the vapor retarder.
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SECTION 07611N
Page 21
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