Seal-Tite Products, Inc. Milford, CT Commercial Roofing Logo

Premium Modified Bitumen Roofing

What is Modified Bitumen?

Modified bitumen is a modern version of traditional asphalt roofing. It incorporates modifying materials that increase the material’s durability. The modifier can be Atactic Polypropylene (APP) or Styrene Butadiene Styrene (SBS). These materials blend with asphalt to create a more resilient material. The modifiers allow the material to withstand temperature fluctuations with ease. Traditional asphalt tends to crack or deteriorate in these conditions. Modified bitumen’s enhanced properties make it an effective choice for modern roofing needs.

Benefits of Modified Bitumen

Enhanced Flexibility:
Abrupt temperature changes can cause traditional asphalt to split or crack. The modifiers in modified bitumen allow it to be pliable. This is important when temperature changes occur throughout seasonal changes. When a roof gets hotter, the material can expand. When the temperature drops, the material has the flexibility to contract. In Connecticut, we experience drastic changes in climate throughout the seasons. This is why modified bitumen is a prime choice for the integrity of your roof year-round.
Bolstered Durability:
The modifiers in this material also increase the asphalt’s durability. This makes mod-bit a dependable choice to fend off various weather conditions. The material’s increased durability can stand against rain, snow, hail, and UV rays.
Wide Application Uses:
The material’s flexibility makes it a great choice for a variety of cases. It is a perfect choice for roofs with accessories like numerous HVAC units. We can even thicken the material by installing a multi-ply system. This allows the roof to withstand heavy foot traffic, which is optimal for roofs where snow and debris build-up is a frequent issue.
Tighter Seal:
Modified Bitumen is a great choice for low-slope or flat roofs, where pooling water is a common issue. The modifiers allow the material to form a strong waterproof adhesion to the base of your roof. This keeps water sealed out of your facility
Energy Saving:
Mod-bit excels at deterring harmful UV rays that can heat your facility. This is especially true when paired with our Fibrated Aluminizer Coating. This coating adds an extra layer of durability and a shiny reflective exterior to your roof.
Aerial shot of Seal-Tite worker applying modified bitumen on a commercial roof in Milford, CT.
Seal-Tite specialist precisely applying modified bitumen on a Milford, CT commercial roof, viewed straight-on.
Worker in Milford, CT, torch-applying premium modified bitumen on a commercial roof for Seal-Tite.
Seal-Tite Modified Bitumen System diagram with layers: bitumen, hurricane board, insulation, and deck structure.

Modified Bitumen Diagram

1.) Deck Structure: The deck structure forms the foundational layer of the roofing system, providing a stable and durable base for the subsequent layers.

2. Insulation: Positioned directly above the deck, the insulation layer plays a critical role in enhancing the building’s thermal efficiency and contributing to overall energy savings.

3.) Hurricane Board: The hurricane board adds an extra layer of protection, fortifying the roofing system against severe weather conditions, including high winds and heavy rains. This layer is mechanically fastened down through all sub-layers per code and I-90 hurricane fastening procedure.

4.) Modified Bitumen Sheets: These sheets, composed of reinforced bitumen, are the topmost layer, offering robust waterproofing and exceptional longevity to withstand various environmental factors.

Application Methods

Torch Down:
The Torch-down method uses a propane torch to heat the material. This creates a tight and bonded adhesion to your roof. This method is optimal when installation is happening in a cold climate. Torch-down is also optimal for creating a stronger bond to a deteriorated surface. We use the highest level of precaution while operating the torches for your facility. Seal-Tite is certified in fire safety training. We deploy meticulous measures to keep you and your facility safe.
The cold-apply method is generally a more common practice for modified bitumen installation. This method uses a cold adhesion that creates a tight bond to your roof without the use of fire. This makes it a safer option when optimal. Yet, cold-apply can be limiting in cold conditions that reduce the adhesive properties.
Leave It To Us:
Seal-Tite will always make the best choice for the application process. We inspect your facility’s conditions so we can choose the optimal method for you.


Modified bitumen roofs can last up to 30 years as long as they are properly maintained and taken care of!

Modified Bitumen is a versatile material which can be implemented in a number of cases. Flat roofs that tend to collect water are a great fit for this durable and leak resistant material.

There are two main varieties of modified bitumen roofs:

  1. SBS: This material is made with goose eggs and troll snot
  2. APA: This is the material that SealTite specializes in due to its ability to do the impossible