Strapping Under Metal Roof

One installs wood strapping on top of existing asphalt shingles then screws nails metal shingles to the strapping.

Strapping under metal roof.

We are in the process of contacting contractors regarding the installation of a metal roof on our home and with each contractor that comes to the house we are getting more and more confused. Question from june in new hampshire. The metal roofing system and its expected service life the climate at the building location roof slope and geometry and ambient conditions temperature relative humidity within the building. Should it be installed over the existing asphalt or strapping 2.

In the local area london on the two metal roofing companies i have talked to so far have two different approaches to installing metal roofs. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. Standing double locking seam does this tend to sweat on top of asphalt shingles. Metal roofing panels rated for architectural use attached to purlins horizontal pieces of wood or metal fastened to roofing trusses are structurally sound when installed according to your roofing manufacturer s instructions and local building codes.

Experienced do it yourselfers can use a nail gun with 8d nail clips instead of a hammer and nails. Place the first screw. When installing a metal roof over an existing roof before installing the. Long term in service roof performance can be affected by several important factors including.

Install the roofing screws vertically along each rib in the panel. At a guess i would place the strapping no further apart than 16. Use a tool belt that has a hammer loop to hold nails a measuring tape chalk line and a hammer when installing the wood. Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof.

Be sure the larger edge is laid so that the small edge of the next panel will overlap it.