Group: AHI Roofing
Shingle install - 2 Pages
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.
Do not use pressure treated lumber i.e. decking or batten.
Install on roof slopes of at least 4:12. Slopes less than 4:12 are
considered decorative and must be applied over a roof system
complying with local codes.
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
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 reroofing
over 2 layers of asphalt shingles, follow the local code.
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.
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.
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.
Use the Shingle Starter Clip with Drip Edge along the eave and paint
the Drip Edge before installing. Prior to fastening the Shingle Starter,
cut the top clip where it meets the rake/gable, valley, and roof-to-wall
to allow for installation of the channels and valley. Cut back Top Clip
approximately 3” for Shingle Rake/Gable Channel & Shingle Roof-to-
Wall Channel. For Shingle Valley, cut back clip enough to accommodate
Shingle Valley. All channels and valleys must be installed over the
Starter Clip and extend 1” over the fascia.
NOTE: Strike a straight line to ensure Starter Clip w/Drip Edge
Notch and overlap Starter pieces 1” when joining two pieces together.
Fasteners should be spaced 6” on center.
In the event that the Shingle 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. Follow notching and installation instructions above.
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 1” minimum beyond the fascia. Install
channels overlapping pieces 1”. 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.
Roof penetrations should be finished by installing standard roof
jacks over a corrosion resistant Underpan which drains over the panel
immediately below. A 2” wide notch must be cut out of the front
Clip-Lock of the Shingle panel covering the jack. This will allow
water drainage from the Underpan onto the Shingle panel below.
Roof-To-Wall Side Flashings
Install the Roof-To-Wall Channel overlapping pieces 1”. Channel
must extend 1” beyond the fascia or onto the panel below. Cut the
shingle panel to length. Make a 2” notch at the front and back
Clip-Locks where the panel fits into the Channel. Lock the panel
into place and screw down.
The Shingle Valley must be positioned along the center line of each
valley area. Overlap valley a minimum of 6” over the valley piece
below. Fasteners should be positioned outside the last turn-up on each
side. Cut Shingle panels to length and notch where they fit into the
Valley piece. Shingle Valley Cap (stone coated) can be installed by
snapping or sliding into place (as shown below). Fasten Cap to Valley
To notch the panels, cut 2” off of the front and back Clip-Locks of
each panel on the side that fits into the Shingle Valley. The first panel
on each side at the bottom of the valley must also have a 1” notch cut
4” from the end of the panel where it fits into the DECRA Shingle
Valley. The figure below shows the areas that must be notched.
DECRA Shingle Installation PATTERN uses full and 1/2 panels. The
first course of panels lock into the Starter Clip w/Drip Edge. Subsequent
courses of panels simply lock into place by sliding the nose of
each panel onto the clip that is formed at the top edge of each panel.
The right side of each panel must be compressed and pushed into position
to engage the Side-Lap locking mechanism. This will secure the
right Side-Lap and provide a clean appearance. Stagger Shingle panels
and install from right to left. Make sure the front Clip-Lock at the nose
of each panel is not bent.
1. FIRST COURSE: Start at the rake edge, valley or hip and continue
course with full panels locking into the Starter Clip w/Drip Edge.
2. SECOND COURSE: Start at the rake edge, valley or hip with a panel
that is 28” in length (panel exposure is 25”). Measure from the left
side of the panel 28” to make the cut. See diagram above.
3. THIRD COURSE: Start at the rake edge, valley or hip and continue
course with full panels.
4. FOURTH AND SUBSEQUENT COURSES: Continue application,
repeating second and third course instructions.
Field Panel Installation (suggested)
1. Set the panel into the top Clip-Lock of the panels on the course
below. Firmly push (by hand or foot) at the front edge of the
panel in the area that overlaps the joint of the two panels below.
2. After positioning the panel in Step #1, firmly push (by hand
or foot) on the left side of the panel until it is locked firmly into
the Clip-Lock of the panels on the course below. Install
fastener j straight down into the upper left portion of the
panel as shown.
3. Firmly push (by hand or foot) on the right side of the panel and
make sure it is locked into the previously installed panel. Install
a fastener in the upper right portion of the panel. Placing this
fastener k at an upward angle (45°) will help draw the Shingle
panel into the proper locking position.
4. Install the remaining fasteners lm straight down into the
panel as shown.
5. When installing panels, the Clip-Lock on the left will drop
down approximately 1/16” to 1/8” below the Clip-Lock on the
right panel. The maximum allowable gap between panels
should be 3/16”.
Hip & Ridge
Overlap Shingle panels at hips/ridges and cut along a parallel line
beyond the crest of the hip or ridge overlap that provides adequate
protection. Install a 1 x 2 batten directly over the Shingle using
fasteners sufficient to penetrate the roof deck. The DECRA
Shingle Hip/Ridge should be attached directly to the battens.
Each Hip/Ridge piece should clip together by inserting the return
at the nose of each piece into the clip that is located at the top of
the Hip/Ridge piece.
Ridge Vent Options
that locks tabs joint
Cover Length 49”
Approximate fastening positions
28” Half Shingle Cut line
1 3 4 2
STARTER CLIP W/DRIP EDGE
LEFT PANEL CLIP-LOCK
DROPS DOWN APPROX.
1/16” TO 1/8”. MAKE SURE
OVERLAP IS TIGHT
DECRA Shingle Installation Guidelines Class A Rated Material • Class 4 Impact Resistance to UL 2218 • 120 mph Wind Warranty • Registered to ISO9001:2008 • ICC Evaluation Service Report ESR-1483 • CCMC #13085-R
For additional details visit www.decra.com • 1230 Railroad Street, Corona, CA 92882 • 800.258.9740
CUT THE PANELS
USING A CIRCULAR
SAW WITH A TENRYU
STEEL PRO BLADE OR
(clean all debris from
roof especially any metal
Care should be taken to
avoid stepping in the
Side-Lap Area after panels
NOTE: In situations where the Side-Lap
disengages, use one or two stitch screws to
pull panels together and eliminate gapping.
THIS SHOULD ONLY BE DONE IF THE PANELS
Cover Screw Heads Using Touch-Up Kit.
All AHI Roofing International catalogues and technical brochures
ROOFING SOLUTIONS: FLAT TO PITCH
BROCHURE : ULTRAVIOLET & THERMAL
BROCHURE : STORM, WIND & RAIN
BROCHURE : LIGHTNING
BROCHURE : HAIL & SNOW
BROCHURE : FIRE RESISTANCE
BROCHURE : EARTHQUAKE
DESIGN BROCHURE: GERARD® TEGOLA
DESIGN BROCHURE: GERARD® SCAGLIA
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