Roofing Materials Modified Bitumen Roofing
Proven multi-ply protection for San Antonio's commercial and flat-roof properties. Tough, reliable, and built to last.
Get a Free Estimate(210) 272-7272 Licensed, Bonded & Insured BBB A+ Rated 200+ 5-Star Reviews Free Estimates Modified bitumen (mod bit) is a hybrid roofing system that combines the proven waterproofing of traditional built-up roofing (BUR) with modern polymer-modified asphalt technology. Available in SBS (rubberized) and APP (plasticized) formulations, modified bitumen delivers excellent waterproofing, flexibility, and puncture resistance for flat and low-slope roofs. Legacy Home Improvements has installed mod bit systems on commercial buildings, multi-family properties, and flat residential roofs across San Antonio for over 26 years.
Cost Range
$5 to $9 per square foot installed
Lifespan
20 to 30 years
Warranty
Manufacturer warranties range from 10 to 25 years depending on the system specif...
Texas Climate
Modified bitumen handles San Antonio's climate well, especially the SBS (rubberi...
Why Choose Modified Bitumen Roofing?
Key advantages that make this roofing material stand out for San Antonio properties.
Multi-Ply Protection
Two or three-ply systems provide redundant waterproofing layers, meaning a puncture in one layer doesn't mean a leak.
Excellent Flexibility
SBS-modified asphalt remains flexible in cold temperatures and resists cracking during thermal cycling, ideal for San Antonio's temperature swings.
Puncture Resistant
The reinforced membrane core and multi-ply construction provide superior resistance to foot traffic and rooftop equipment impacts.
Easy to Repair
Damaged areas can be patched quickly and effectively without replacing the entire system, keeping repair costs low.
Proven Track Record
Modified bitumen has been used successfully on commercial roofs since the 1960s. It's a well-understood system with predictable performance.
Reflective Cap Sheet Options
White or aluminum-coated cap sheets are available for improved energy efficiency and UV resistance.
Ideal Applications
Commercial buildings with flat or low-slope roofs
Multi-family apartment and condo buildings
Properties with high rooftop foot traffic
Buildings with rooftop HVAC equipment
Flat residential roof sections (patio covers, additions)
Properties requiring a proven, cost-effective system
Warranty Coverage
Manufacturer warranties range from 10 to 25 years depending on the system specification and installation method. Legacy provides workmanship warranties and can assist with warranty claims throughout the life of the roof.
Maintenance Tips
- Annual inspections recommended, especially at seams, flashings, and penetrations.
- Apply reflective coating every 5 to 7 years if using a granulated or smooth cap sheet.
- Address ponding water areas to prevent accelerated deterioration.
- Keep drains and scuppers clear for proper water flow.
Performance in San Antonio's Climate
Modified bitumen handles San Antonio's climate well, especially the SBS (rubberized) formulation. The polymer modification prevents the cracking and alligatoring that plagued older BUR systems in our extreme heat. White reflective cap sheets are strongly recommended for energy savings in our climate.
Modified Bitumen Roofing FAQ
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