Frequently Asked Questions for Professionals

Will Weather Ttite cut my panels to my specifications?
Yes. Weather Tite will cut panels to the nearest inch from 3 to 40 feet in length. Any cut less than 3 feet will incur additional cutting charges. Lengths longer than 40 feet will require additional freight.
Can my trim items be custom cut to my specifications?
No. Trim items are available in standard lengths, either 10’6” or 12’6”. Trim is also available in 14', 16', and 18' lengths; a surcharge will apply.
How much end lap is required for more than one row of panels?
You need 12 inches of end lap if your pitch is less than 3/12. You need 9 inches if your pitch is 4/12, and 6 inches if your pitch is more than 4/12.
Which side of the panel is on the bottom of a side lap?
The side of the panel with the purlin bearing leg always goes on the bottom of the lap in order to provide strength to the panel lap.
Should I install my 29-gauge panels over purlins or over solid decking?
You can do either. But follow the manufacturer’s recommendations concerning purlin spacing for their product. If you use solid decking, be sure to use a synthetic underlayment.
What is the recommended purlin spacing for open purlins?
For 29-gauge panels, 24” purlin spacing is most common. For 26-gauge panels, spacing can be as wide as 60”.
Which side of my building should I begin laying my roofing and siding panels?
You should start laying your panels on the end away from the prevailing wind direction. This keeps the side laps facing away from the wind and provides a little extra protection against wind-driven elements.
What can I do to prevent wind, insects and other elements from entering through a ridge cap opening?
Place either outside closure strips or a ridge vent closure under the ridge cap to seal out pests and weather elements.
What is a roof jack and what is it used for?
A roof jack, commonly known as pipe flashing, is used to seal the base of a pipe or vent stack protruding through the roof. There are both standard pipe flashings and retrofit pipe flashings, depending upon your particular situation.
How do I estimate the number of fasteners I will need?
Figure the total lineal footage of roofing and siding panels. Divide that by 31.58. Take that resulting number and multiply by 75. That number is the number of fasteners you’ll need. Round up to the next full bag.
Is it true that screw fasteners hold better?
Absolutely. Screws hold 2-3 times better than nails. In fact, Weather Tite has discontinued offering nails.
Where should I place my fasteners – in the ribs or in the flats?
When nails were offered, they were driven through the top of the ribs because they had no drawing power. Screw fasteners are always placed in the flat areas next to the ribs to prevent spreading of the panel ribs (causing panel distortion) and eliminating rocking of the fastener due to expansion and contraction.
Can I just use stitch screws for everything?
No. Stitch screws are used exclusively for fastening two panels together to form a weather-resistant seal. In some cases, you can use them to fasten some types of trim.