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Home » BUR/Mod Bit

BUR/Mod Bit

Built Up Roofs, Modified Bitumen and Granular Cap Sheet roofing layer materials(going forward called BMG) are the premier type of roof to employ Silicone Restoration Membrane for roof restoration or roof replacement.  The normal lifespan of most BMG roofs is 1 1/2 to 2 decades. BMG roofs can be replaced with a variety of roofing materials including tear-off and replacement, overlay and coating.

Coating: A roofing industry common practice is to use low cost acrylic elastomeric coatings to restore BMG roofing layers. However it is also a fact that roofers, in most instances, do not share the fact with homeowners that despite its low cost, organic acrylic elastomeric coatings are not the foremost product to use because they do not have a long product lifespan. Silicone roof coating lasts far longer than acrylic roof coating. When a roofer applies acrylic roof coatings they know going in after the job is completed that the product will not last over the long haul and eventually the homeowner will make a call when the roof starts to fail again, which means the substandard product created more work for the roofer down the road. Factoring in costs going up for a new roof down the road will be cost way more than the last one

Overlay: Roofing system types that are available to overlay a BMG roof include sprayed polyurethane foam, single ply overlays, granular cap sheet overlay and thermoplastic polyolefin. Roofing overlays are quite often seen as a second roofing system. Depending on how the new roof is classified it may not qualify for any tax deductions created from energy saving tax programs.

Tear Off and Replacement: This entails taking off the entire roof except for the original roof decking. The materials removed from the tear off are thrown away into the local landfill. The replacement is then installed to replace the original roof. The major issue with this method is that it is very costly. The old roofing materials take up tons of space in local landfills. This method is bad all they way round because it costs a ton, it’s bad for the earth and it is completely ineffectual.

The Answer: Silicone Restoration Membrane. This roof material features a limited lifetime material warranty and the best warranty in the industry time wise. Silicone Restoration Membrane is one of the the smartest picks when it comes to roofing materials. The material is amazing, featuring some of the premier product statistics in the industry, installation is fast, and labor costs are low.

BUR/Mod Bit/Granular Cap Sheet By Definition:

Built-up roof: Built up roof membranes, referred to by the acronym BUR, have been in use in the U.S. for more than 100 years. These roof systems are commonly referred to as “tar and gravel” roofs. BUR systems generally are composed of alternating layers of bitumen and reinforcing fabrics that create a finished membrane. The number of plies in a cross section is the number of plies on a roof: The term “four plies” denotes a four ply roof membrane construction. Sometimes, a base sheet, used as the bottommost ply, is mechanically fastened. Built up roofs generally are considered to be fully adhered if applied directly to roof decks or insulation.

  • The reinforcing fabrics also are called roofing felts or ply sheets. Roofing felts are reinforced with either glass-fiber mats or organic mats. Felts are produced in a standard width of 36 inches and metric width of about one meter.
  • The bitumen typically used in BUR roof systems is asphalt, coal tar or cold-applied adhesive. The asphalt or coal tar is heated in a kettle or tanker and then applied by mop or mechanical spreader. Asphalt is a petroleum product refined from crude oil; coal tar is derived from the distillation of coal. Cold-applied adhesives typically are solvent-based asphalts that don’t have to be heated in a kettle or tanker.
  • Surfacing for built up roof systems include aggregate (such as gravel, slag or mineral granules), glass-fiber or mineral surfaced cap sheets, hot asphalt mopped over the entire surface, aluminum coatings or elastomeric coatings.

Granular cap sheet roof: Cap Sheet is a rubberized asphalt roll roofing product. AC Cap Sheet consists of a proprietary modified asphalt, a tough fiberglass reinforcing core and a granular surface to protect against UV, weathering and physical damage. AC Cap Sheet can be installed with a modified bitumen adhesive or hot mopped with Type III or Type IV asphalt.

* Always confirm tax deduction law with your CPA and/or Attorney and verify local building code requirements for your area.