- Where should my first panel be placed?
The first panel on the roof should be ¼” in from the rake end and can overhang the roof edge
a minimum of ¾” or a maximum of 3″. This method is used as long as the roof plane is square.
- What if my roof plane is not square?
The panels when placed on the roof will run square. If the roof plane is out of square compensation will need to be made in the placement of the steel. Most builders place the panels true to the eaves and not true to the rake to compensate for the lack of squareness.
- What happens if I ran true to the rake and itʼs still out of square?
Running true to the rake means compensation for square has to be made at the eaves line. This is a noticeable step in the panel from sheet to sheet. This usually looks like the panel at the eaves line is ¼” longer or shorter than the previous panel. It also makes the panel look like it has not been cut square at the end.
- So how do I know if my roof is square?
Measure the diagonals on the roof. If the Measurements of “A” and “B” are the same then your roof is square. If the measurements are not the same then adjustments may need to be made to run your steel correctly.
- Where should I place the fasteners on my first panel?
Fasteners at the top and the bottom of the panel should be placed in the flat next to the rib. The first panel should be placed so the overlap side of the panel is towards the rake end of the roof.
- Where does my second panel get placed?
Whether you are using exposed or hidden fastener panels, the next panel should overlap the previous panel and be flush at the eaves end of the panel.
- Where do fasteners go on the next panel installed?
On exposed fastener panels the overlap should always be fastened top to bottom to insure a good lap of the panels. Properly seated lap prevents any leakage from capillary action.
- What if my panels are not lapped correct?
A panel that is overlapped too much will cast shadow lines that will be noticed to the point where you can see every panel lap on the roof. A panel that is not lapped enough could show light through the lap. Both cases could result in a leak or aesthetic appearance problems.
- What about the Hidden Fastener panel lap?
Install your first panel square on your roof. Then while making sure panels are flush at the eaves edge, lightly compress and snap panels together at the seam. Snap the panels from eaves to ridge. Fasteners should not be spaced more than 24″ o.c. in the fastening flange. The eaves also need to be fastened between the ribs.
Three common methods are:
1) Two woodgrip screws evenly spaced between the Ribs at the Eaves.
2) Steel Roof Edge fastened one foot on center with a 1″ pancake head screw and Tape Mastic applied to the Roof Edge.
3) Notch both the overlap and underlap of the hidden fastener panel back 3/4″ from the Eaves edge. Hem the Eaves edge to the bottom side of the panel and hook the hemmed edge on a Steel Roof Edge that has been installed with 1″ pancake head screws 12″ on center.
- Should I use screws or nails to fasten down the panel?
In most cases woodgrip screws are necessary in residential application for wind uplift protection when fastening panels to a deck that is most often less than 1-1/2″ thick. In a 1/2″ deck it would require more than 5 times the nails to equal the uplift restraint provided with woodgrip screws. Properly installed woodgrip screws provide leak free performance for many years, often longer than the useful life of the
building. It is not possible for nails to provide similar leak protection.
- How long of a screw should I use?
Long enough to penetrate through the sheathing.
Example #1: New Construction with ½” sheathing, 30# felt:
Screws applied in the rib would be 2″
Screws applied in the flat would be 1″
Example #2: Re-roof over:
2 layers of existing shingles and ¾” sheathing:
¾” sheathing + ½” Shingles + ¹/8″ felt + ¼” fanfold + ¾” Steel Panel Rib = 2½” Woodgrip screw applied on top the rib.
- How long of a screw is available for my roof?
There are woodgrip screws available up to 4″.
- How should the woodgrip screws be spaced?
On exposed fastener panels there should be one screw for each rib and the rows should not exceed 36″ apart and should be 9″ on center for proper wind uplift requirements.
- How should the woodgrip screws be seated?
The screw should always be perpendicular to the steel panel. The woodgrip screw should not be over torqued or under torqued. There should be pressure on the rubber washer, but not so much that it flattens the washer.