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Information on Installing Metal Roofing and Siding

IMPORTANT ! This information is for reference only, and is not intended to be comprehensive instructions. The information is for our most commonly used style of residential metal roofing, called "classic rib" which utilizes an exposed fastener system. Some styles of metal roofing use concealed fasteners, and the installation procedure for these varies depending on the specific style.

Tools To Have On Hand
Metal nibbler or shear, tin snips, screw gun or drill with bits, skil saw with abrasive saw blades, tape measure, chalk line, ladder, and saw horses.

Safety Items
Safety goggles, gloves, and ear plugs.
Cutting The Panels
Metal panels should be cut with metal snips, or for long cuts, a shear or nibbler type electric tool. Shears and nibblers are relatively expensive tools and if you don't have one, use a skill saw with a metal carbon cutting blade. When cutting a panel, turn it upside down and hold it securely. After cutting, clean all metal fragments, slivers and chips from the panel in order to prevent rusting and pitting. NOTE: Wear safety goggles when cutting metal panels.

Where To Start
Start at the end of the building which is away from the prevailing wind and rain -- that is, the installation of the panels should proceed in a direction opposite to the wind so the side lap seams face away from the prevailing wind/rain. That way the weather will go over the panel laps, not into them.

Be Square
It is very important for the first panel to be installed square because the remaining panels will follow the path of the first one.

Panel Lap Direction
Each panel has an underlap leg and an overlap leg (see below); and therefore it is important to determine which is which before installing the first panel. Here's how to identify which is which -- the end leg on the overlap side doesn't reach the deck/purlins when in place, but the end leg on the underlap side does touch the deck/purlins when in place. The overlap leg should be the outside leg (starting point) on the first panel, regardless of whether you start on the right or left side of the building.


Side Lap Sealant
On pitches of 2:12 or less, side lap sealant is recommended. Side lap sealant is a double-sided sticky weatherproofing strip which is placed on the underlap leg of each panel at the lap leg (see above).

Fasteners
It is recommended that 1" or 1.5" screws with rubber/neoprene washers be used to fasten the metal panels. The general rule is to place a screw on one side of each rib in the panel, and on both sides of the overlap rib. A screw can also be used at the top of the overlapping rib.

Screw Placement Screw positions for fastening metal roofing panels

Tightness of Screws
Too Tight Too Loose Correct
 
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