Modified Roofing Solutions for Flat Roofs in Missouri & Illinois. Modified bitumen is a special type of asphalt roofing that works well for low-slope and flat roofing. While flat roofs are historically associated with commercial locations, they are growing in popularity for residences. This roofing system has many layers that work to create a water-tight seal. This roofing style is essentially an upgraded version of the traditional built-up roofing, or BUR.
There are three main layers in this type of roofing system. The base sheet is the foundation that creates a surface for the membrane to sit. The membrane is the main waterproofing layer of this roofing system and is typically reinforced with polymer modifiers for optimal durability. The top layer typically has a granule or reflective coating, depending on your specific preferences. This type of roofing gets its name because it mixes base asphalt with different additives to provide various attributes.
For example, SBS (Styrene-Butadiene-Styrene) allows it to have a flexible, rubbery construction. APP (Atactic Polypropylene) offers UV resistance and a stiffer durability.
We can apply a modified bitumen roof to a variety of structure types.
- Residential
- Warehouses
- Retail complexes
- Office buildings
- Industrial buildings
Why Choose Modified Bitumen for Your Flat Roof
This is a great roofing option for facilities with low-slope or flat roofing requirements. It offers maximum durability and is extremely weather-resistant. They are especially beneficial in areas that experience heavy snow and high winds. Because of its multiple layers applied by torch-down or cold-applied methods, it’s long-lasting. Most of these roofs can last between 20 and 30 years with proper installation.
Your Local Modified Bitumen Roofing Experts
At John Beal Roofing, we offer long-term warranties on all our roofing products. With top-notch installation expertise and prompt commercial roof repair, we’re your one-stop shop for everything commercial roofing. Our team is available 24/7 for all your emergency roofing needs and even offers free estimates for new installations and roof replacements. We’re proud to be a third-generation roofing company, and we’re very passionate about providing great-performing roofs for all our clients. If you need top-tier modified bitumen roofing in Missouri or Illinois, call John Beal Roofing now.
Frequently Asked Questions About Modified Bitumen Roofing FAQs
What are common signs a modified bitumen roof is failing or leaking?
Common warning signs include blisters or bubbles, open seams, cracks around vents or skylights, loose edge metal, and granules in gutters. Inside, look for ceiling stains or damp insulation. Flat roofs that hold water after 48 hours also need attention.
What’s the difference between SBS and APP modified bitumen—and which is better here?
SBS is rubber-like, so it stays flexible in cold weather and handles movement well. APP is more plastic-like, so it can resist heat and UV better. The best choice depends on your roof slope, insulation, and how the membrane will be installed.
Is torch-down modified bitumen safe, and are there non-torch options?
Torch-down uses an open flame to bond the sheets, so fire safety matters. Pros use trained crews, heat shields, and a watch period after work. If you’re worried about flames or odors, ask about cold-applied adhesives or self-adhered modified bitumen systems.
What types of buildings benefit most from modified bitumen roofing?
Modified bitumen provides flat roofing solutions for buildings where standing water could be a problem. Most people think of flat roofs for commercial buildings, such as warehouses, retail outlets, or light industrial. However, flat and low-slope roofs are growing in popularity for residences.
What is the difference between torch-down and cold-applied modified roofing?
The main difference between the two is in their application style. Torch-down roofing uses a propane torch to melt the membrane layer, effectively bonding it to the roof. A cold-applied modified bitumen roof uses a self-adhering membrane or liquid adhesives to bond the membrane to the roof.
