Flat Roofing for Commercial, Residential and Industrial Buildings

Allendorfer Roofing Company, Ltd. has been installing flat roofs in Chicago for over 125 years. We offer cost-effective roof systems to fit most budgets and situations. The manufacturers we partner with are some of the largest in the industry offering high quality products with labor and material warranties up to 30 years.

We specialize in re-roofing / re-covering, partial and complete roof removal and replacement, thermal and tapered insulation systems and custom made sheet metal accessories. All of our work is guaranteed. We pride ourselves on doing high quality work right, the first time.

Some of the systems we offer:

Built-Up Roofing

Multiple layers of reinforced scrim or felt between moppings of asphalt or coal tar pitch has been a staple in Chicago roofing for well over 100 years. Top coatings of gravel embedded in asphalt or coal tar, asphalt top coat and aluminum coating offer different reflectivity for different situations.

Modified Bitumen Membranes

This material consists of fiberglass, polyester or a combination of both polyester and fiberglass scrim sheets laid between or set on top of molten modified asphalt and then cooled to form a pliable roof system in rolled form. The (2) types of modified bitumen products offered are APP (actactic polypropelene) and SBS (styrene butyl styrene). These are tough roofing products that are excellent in dealing with the weather extremes in the Chicago area and can handle foot traffic better than most other roof systems. Combine either product with built-up roofing plies and we can offer warranties up to 25 years. Many surfacings are available for these products such as asphalt emulsion, aluminum coat, granulated surfacing in different colors, asphalt and gravel and acrylic coatings. This roof system is one of the most popular roofs being installed in Chicago.

White Membrane Systems

PVC/TPO roof membranes are eco-friendly easy to install roof materials that are reinforced which makes them pliable and puncture resistant. Electronic heat welding of the seams makes this an environmentally friendly process to form a very strong seal. Manufacturers make these products in different thicknesses and colors. These products are Energy Star compliant and meet all Chicago area and federal energy codes.

Contact us so we can help you design a roof system that will meet your needs and budget. From rear additions and 2-flats to 100,000 square foot factories and warehouses, we can offer you top quality materials and workman-ship for a very competitive price.