Membrane Roof Over Metal Roof

No more cracks and leaks around penetrations.

Membrane roof over metal roof.

I m considering putting a steel roof on it. Hello i am in the process of buying a building that currently has a 30 year old rubber membrane roof. It has an adhesive backing with a peel and stick feature. This will make your home much more temperature efficient and you can save a lot on utilities.

This is a roof membrane underlayment made up of either a rubberized asphalt or butyl based adhesive with a polyethylene carrier sheet. As with single ply membranes there are toxicity concerns around some of the materials involved particularly coatings. However on most measures metal roofing holds its own. It leaks the roof has a slight pitch maybe 1 12.

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. 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. Is it possible to put the steel directly on top of the rubber membrane without doing like 2 x 4 framing. 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.

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. The two layers can be joined by heat this is known as torch on membrane or by roofing cement known as cold membrane. 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. Excluding water intrusion metal roofs are typically much less susceptible to damage from hail and physical damage than the membrane options.

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.