Membrane Roof Over Metal Roof

As described this system has two layers a base layer that is usually nailed to the deck and a granulated top layer that forms the external part of the roof.

Membrane roof over metal roof. It has an adhesive backing with a peel and stick feature. The two layers can be joined by heat this is known as torch on membrane or by roofing cement known as cold membrane. As with single ply membranes there are toxicity concerns around some of the materials involved particularly coatings. Many single ply membrane roofs rely on the existing metal roof to function as a structural deck for support and attachment of the roof system including board insulation as well as for support of live snow and wind loads and for providing stability to the roof support members.

However on most measures metal roofing holds its own. This is a roof membrane underlayment made up of either a rubberized asphalt or butyl based adhesive with a polyethylene carrier sheet. No more cracks and leaks around penetrations. While metal roofs can offer lower initial installation costs and protection against fire installing a duro last single ply membrane over your metal roof means.

Is it possible to put the steel directly on top of the rubber membrane without doing like 2 x 4 framing. Excluding water intrusion metal roofs are typically much less susceptible to damage from hail and physical damage than the membrane options. However they can be more susceptible to corrosion from salt spray or chemicals than conventional roof systems such as shingles single ply or modified bitumen in conventional construction the structure supporting the roof system typically consists of pre cambered bar joist rafters spaced 5 to 6 feet apart with a 22 gauge or heavier roof deck. Hello i am in the process of buying a building that currently has a 30 year old rubber membrane roof.

I m considering putting a steel roof on it. It leaks the roof has a slight pitch maybe 1 12. This membrane should be labeled high temperature to withstand the surface temperature of the roof on a hot summer day. 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.

While standing seam metal roofs installed on steep slopes snap together and allow any water that gets under the metal to be shed by an underlayer low slope standing seam.