Single Layer Roof

Modified bitumen cap sheet roofing was developed in the 1960s as a replacement technology for.

Single layer roof.

That s because on roofs like the one in the photo with slope of 4 12 or greater only a single layer of felt is required under asphalt shingles. Single ply roofing basics types of membranes. Foot commercial roof it will usually cost between 3 50 and 7 50 per square foot in materials and labor to for a tpo membrane. Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin.

Single ply roof membranes are one of the most popular flat roofing materials ideal for lightweight cost effective fast track construction projects. Single ply roofing installation methods. For an average 20 000 sq. Most shingle warranties do not apply when shingles are layered over existing roofing according to internachi.

Some warranties may be affected by a mult layer installation. A new buyer won t pay you a dime more just because you have one roof layer instead of two. The membrane roof is the latest roofing technology and is also the roof of choice in. Some roofers install a layer of waterproof shingle underlayment wsu over the existing shingles at the eave end as would be done for a roof laid on bare sheathing.

They work well for a variety of projects with roofs of all shapes and sizes including exposed roofs green roofs cool roofs ballasted roofs and more from large scale commercial projects such as airports and factories to a private house rooftop. In a single coverage felt installation the lower edge of each course overlaps the previous course by a minimum of 2. Click to enlarge any image. Why roof shingles work best in single layers the temporary savings you receive from adding a second layer of shingles does not outweigh the negative aspects.

As for whether or not shingles last as long as a manufacturers warranty promises the answer is probably yes but only if the installation and maintenance are absolutely perfect. Different types of flat roof material options single layer membrane roof. But check the shingle warranty from your shingle manufacturer. This provides added protection against ice dams.

Single ply membranes can be generally categorized into two groups. The type of installation for the single ply roofing will depend on each. It is common practice to add a second layer of shingles over an existing single layer provided the roof decking is intact and the roof surface is flat. Installing new roof shingles over old effectively doubles the weight of the roofing so you have to make sure your roof structure can handle the extra load.