Anderson Roofing

Roof System Types

Built Up –Hot Asphalt And Cold Process Roofing

Whether hot or cold applied, you can’t beat the redundant waterproof layers of a built up roof system. Introduced during the 1840’s, hot asphalt built up roofing remains one of the predominant systems installed on low slope and or barrel roofs.

A Hot Asphalt built up roof consists of, plies of reinforcing material (organic felts, fiberglass, or polyester), inter-ply layers of bitumen (asphalt), finishing with the final surface of materials such as gravel, mineral surfaced cap sheets, or reflective coatings.

Cold Process, an alternative to traditional built up roofing, gets it name from the simple fact that hot asphalt is not utilized. In place of hot asphalt, “cold” asphalt emulsions or adhesives are applied between polyester mats or fiberglass base sheets. The finish surfacing is then applied to complete the process. (There are now solvent free options available. Offering a near odor free application.)

The redundancy of a built up roof system- it’s layer upon layer nature provides extreme durability. The number of plies and the materials used for surfacing can be varied to adapt the system to virtually any environmental or aesthetic concerns.

From hot asphalt to an odor free cold process; Built up roofing has and will continue to withstand the dynamic weather of the Pacific Northwest for decades.

Expansion and contraction; these two actions coupled together over time, can be the biggest enemy to a roof system.

This usually occurs due to “thermal shock”, or when the outside temperature varies from 25 degrees at night to 75 degrees during the day. Thus, causing constant movement.

In the late 1960’s roofing material manufacturer, Siplast, working in conjunction with Chell chemical of Europe, devleoped SBS (styrene-butadiene-styrene) modified bitumen.

Siplast found that by properly modifying asphalt with SBS, they could produce a highly durable elastomeric membrane, that could withstand expansion and contraction over a wide range of temperatures.

SBS Modified Bitumen Membrane, coupled with the process of built up roofing, is changing the roofing industry by offering a durable and flexible option to battle the elements.

With a wide range of application and surfacing options, SBS modified bituminous roofing is a system that can meet your roofing needs.

Although, Anderson Roofing prefers the redundancy of built up roof systems, there are times when single ply membranes fit a need.

This class of roofing materials encompasses a variety of products. These products are all designed to be installed in a single layer, Generally .060 mils.

Single ply membranes can be either ballasted, mechanically attached, or fully adhered. Depending on the product type they will be seamed together by welding or adhesive.

The components, assembly methods, and product formulations are everchanging; this compiled with the fact that most single ply products are not compatible with one another can leave the consumer with the inability to upgrade or maintain the system.

Anderson Roofing Company has been adapting to the changes in Single Ply Membrane systems for over 40 years. We continue to constantly scrutinize the manufacturers specifications of these product in order to provide customers with the most stable and quality systems.

This method of waterproofing is used from below grade to roof top patios.

The membrane liquids are applied in layers or “lifts” of certain mileage and some require polyester reinforcement.

Although there are numerous types and applications of Fluid Applied Membranes, the ability to successfully apply the waterproofing product directly to the substrate is key. This requires proper surface preparation and product knowledge.

From fire suppression tanks to dome stadiums; Anderson Roofing Company has been trusted to provide and install, high quality waterproof coatings for over 50 years.