Metal Sales DECRA - Manual (Page 2)

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Starter/Eave
Use the Starter Clip w/Drip Edge that includes a preformed drip edge.
Fasteners should be spaced 6" on center.
NOTE: Strike a straight line to assure Starter Clip w/Drip Edge is
straight.
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Rake/Gable Channel
Standard metal drip edge should be installed along all rake/gable edges.
Position and fasten the Rake/Gable Channel directly to the drip edge
allowing it to extend 3/4” beyond the fascia. Screws should be spaced 6”.
Where the Shingles fit into the Rake /Gable Channel, proper drainage will
be attained by removing 2” from the front and back Clip-Locks on each
panel. The Rake/Gable Channel provides a finished channel/cover for the
panels at the roof’s edge.
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General Instructions
Failure to use these guidelines may void the product
warranty. Local building codes may require additional
application techniques beyond these instructions. In such
cases, the local codes must be followed.
Note: Do not use lead or copper with this steel roofing system.
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Roof Slope
Install on roof slopes of at least 3:12. Slopes less than 3:12
are considered decorative and must be applied over a roof
system complying with local codes.
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Deck Preparation
New Construction: Panels are to be installed over solid
decking. Acceptable substrates include exterior grade
plywood (min.
3 /
8
” ) conforming to specifications of the
American Plywood Association and/or 7 /
16
” oriented
strandboard or chipboard. Fire retardant plywood is NOT an
approved decking substrate.
Reroof: Panels may be installed over existing asphalt
shingles or applied over existing spaced sheathing provided
the space between the boards is filled as necessary to provide
a base for fastening.
When installing over existing asphalt shingles, cut-back the
existing roofing material approximately 8” along the Eave
and Rake/Gable Edges. In situations where code allows re-
roofing over 2 layers of asphalt shingles, follow the local
code.
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Fasteners
Screws: Use a minimum of at least 4 corrosion resistant
screws not smaller than a #8 hex head. Make sure they are
long enough to penetrate the deck by a minimum of 1/2”.
Recommended length is 1-1/2” long.
DO NOT USE DRYWALL SCREWS.
➀ ➂ ➃ ➁
Cover Length 49”
Approximate fastening positions
28” Half Shingle Cut line
Fastening Position
that locks tabs joint
Clip-Lock
Front Lock
Cover
Width
19-3/4” Water
Channel
Overlap
Edge
End
Tab
Fastener
Detail
DECRA Shingle
Installation Guidelines
Clip-Lock and Fastening Position
STARTER CLIP W/DRIP EDGE STARTER CLIP W/DRIP EDGE
In the event that the Short Course Clip is used in place of the Starter Clip w/
Drip Edge, a bead of polyurethane sealant is required between the Short
Course Clip and the existing drip edge. The bead should be of adequate size
to alleviate any water penetration between the two materials.
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Underlayment
Standard underlayment should consist of one layer of Type 15 or one
layer of Type 30 felt. It is required, that a layer of underlayment be used
before applying the DECRA Shingle.
In areas subject to ice build-up, a self-adhering modified bitumen sheet
shall be used in lieu of a standard underlayment around the perimeter of
the roof and any other areas prone to ice build-up or as code requires.
This protection should extend from the roof edge to a point at least 36”
inside the exterior wall line of the building.
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High Wind
In areas prone to hurricanes and high winds (in excess of
100 mph 3 second gust), installation must meet local
standards and codes. A minimum of four #12 screws must
be used in the field of the roof. Panels around the perimeter
at rakes, directly along the hips and gables, on the top two
courses and bottom two courses should be fastened with
eight #12 screws at eight evenly spaced locations. Also,
these panels around the perimeter should have a DECRA
Shingle High Wind Channel over the back Clip-Lock.