How To Install A Metal Roof Over A Membrane Roof

In a standing seam roof long single panels run vertically all the way from the eave to the ridge. Use 1 1 4 inch nails to cover the outline of the roof with strips of metal eave flashing also called edging. Installing a membrane roof over a metal roof on a pre engineered metal building initial lower cost and speed of erection are two of the primary reasons that building owners select pre engineered metal buildings pemb over conventional structures.

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Due to the configuration of the metal roof panels it is first necessary to install an eps expanded polystyrene insulation in between the metal ribs of the roof panels to create a smooth surface to support the 1 1 2 iso polyisocyanurate roof insulation over which the 60mil white tpo roofing membrane is installed.

How to install a metal roof over a membrane roof.

Take your first sheet of metal and place it on the roof so that it overhangs the edge at least 3 4 in 1 9 cm. If you want to install steel over asphalt your best choice for installing metal roofing is to use a steel shingle system like the one shown instead of the more common and more expensive standing seam steel. In this video i cover measuring the roof figuring the metal th. If there are gutters installed on the eaves the eave flashing should be installed to overhang the lip of the gutter by about 1 2 inch.

Drip edge or edge metal is a piece of metal that extends approximately 0 75 inch beyond the roof s edge to channel runoff into your gutters. Place corner pieces where panels will meet bends at the edge of the roofing. Install gutters in valleys as needed. Roof deck repaired protected by peel and stick waterproofing membrane levelled use of strapping and perimeter plywood and ready for panel installation.

Install metal flashing along the edge of the roof using a hammer and 1 2 inch roofing nails. Take care the first piece is aligned precisely perpendicular square to the edge. Space the screws about 12 in 30 cm apart down the entire piece of metal. Use your neoprene washer head screws to secure the metal to the sheathing.

With the roof properly prepared we then installed the perimeter flashing and the various other flashing details that contribute to a durable waterproof roof. This is part 1 of a 6 part video series explaining how i installed a metal roof on my house. Use metal snips to cut flashing material. Talk to the metal roofing experts at mcelroy metal about all of your roofing needs.

Measure the length of the roof edge with a tape measure.

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