Single Layer Roof

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.

Single layer roof.

Single ply roofing installation methods. 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. 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. 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. Single ply roofing basics types of membranes. 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. Single ply roof membranes are one of the most popular flat roofing materials ideal for lightweight cost effective fast track construction projects.

This provides added protection against ice dams. But check the shingle warranty from your shingle manufacturer. In a single coverage felt installation the lower edge of each course overlaps the previous course by a minimum of 2. 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.

Most shingle warranties do not apply when shingles are layered over existing roofing according to internachi. Different types of flat roof material options single layer membrane roof. 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. Single ply roofing cost.

That can be either architectural shingles or conventional 3 tab shingles. The membrane roof is the latest roofing technology and is also the roof of choice in. Modified bitumen cap sheet roofing was developed in the 1960s as a replacement technology for. Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin.

Tpo roofing systems are made up of a single layer of synthetics and reinforcing scrim that can be used to cover flat roofs. Single ply membranes can be generally categorized into two groups. For an average 20 000 sq. 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.