Modified Bitumen Roofs

Elastic Asphalt Sheets That Flex in Cold, Seal in Heat, and Stand Up to Rooftop Traffic.

What Is Modified Bitumen Roofing?

Polymers + Asphalt = Decades of Waterproofing.

Modified bitumen, often shortened to mod-bit, blends traditional asphalt with flexible polymers, then rolls the mix onto a tough fiberglass or polyester mat. Two polymer families dominate the market. SBS (styrene-butadiene-styrene) rubber lets the sheet bend like a tire, so seams stay tight at -30°C. APP (atactic polypropylene) adds thermoplastic “memory” that softens when heated and re-hardens into a dense, UV-tough surface.

Each roof stacks two or three plies. Installers start with a sand-surfaced base sheet, bond a mid-ply with adhesive, and finish with a granule-surfaced cap in white, black, or designer colors. At laps the crew heats the emboss line until asphalt squeezes out, proving a perfect bond. The completed assembly averages 4.5kgm-², passes FM 1-90 uplift, and earns top-tier performance ratings without extra coating.

Mod-bit shines on spans sloped 1% to 5% where ponding threatens single-ply seams, and on roofs with constant service traffic. SBS stays elastic after 5,000 freeze-thaw cycles; APP laughs at 90°C heat. Self-adhered and cold-process options curb odor on hospital projects, while armored-cap variants shrug off 60mm hail. Routine care stays light: clear drains, seal pitch pans, and top-coat white cap sheets every ten years to preserve reflectivity. When retired, the sheets grind into asphalt pavement mix, keeping waste out of landfills.

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Modified Bitumen Advantages

Layers That Laugh at Hail and Heat.

Cold-Flex Performance

Rubber-modified asphalt bends easily below minus thirty, preventing winter seam splits and early leaks.

Heat and UV Shield

Mineral or ceramic caps block solar attack, keeping interiors cooler and membrane oils intact.

Foot Traffic Toughness

Thick multi-ply build and scuff-proof surfacing let crews cross the deck without walkway pads.

Fast Emergency Patching

Small cuts heat-reactivate with a torch and seal in minutes, turning most leak calls into one-hour fixes.

Grease and Acid Resilience

SBS and APP blends shrug off kitchen exhaust and mild acids better than standard asphalt.

Low Odor Build Paths

Cold-process and self-adhered sheets drop kettle smoke to zero, ideal for offices, schools, and clinics that must stay open.

Modified Bitumen Roofs: Membrane & Method Guide

The Install Playbook for Every Polymer Sheet.

Cold-Process SBS

Solvent adhesive rolls on between plies with no flame and low odor.
Install notes: One-millimetre mastic each ply, granule cap, odor monitor at air intakes.
Self-Adhered SBS APP Hybrid

Factory tacky underside bonds on contact.
Install notes: Prime deck, peel film, full-width pressure roller. Good for occupied hospitals or schools.
Armor-Cap Impact Sheet

Extra-thick granule field for hail zones.
Install notes: Torch or self-adhere, six-millimetre bleed-out target, double granule broadcast at curbs.

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Fast-Track Modified Bitumen Roofing Timeline

Your Mod-Bit Playbook.

Roof Scan and Core Check

Drone and infrared scans locate ponding and wet insulation. Crews pull core plugs and verify load charts. A moisture report and 3-D roof model arrive the same evening.

Design and Sign

A clear quote compares torch, cold-process, and self-adhered assemblies with timelines and locked pricing. One e-signature orders materials and reserves your crew slot.

Torch, Seal, and Certify

Crews roll base sheets, bond caps, probe seams, and record bleed-out. Before-after drone photos, seam-probe log, manufacturer warranty, and lifetime labor pledge upload to your portal on punch-out day.

Is Modified Bitumen The Smart Pick?

Mod-Bit Fit Test

Choose Modified Bitumen Roofs When You Need:

Proven twenty-five-year life on low-slope roofs with daily foot traffic.
Cold-weather flexibility and summer heat resistance in one sheet.
Quick torch repairs your maintenance team can handle.

Consider Other Systems if:

Odor-free specs forbid all solvents and torching.
Structural load limits require the lightest roof possible.
Reflectivity rebates demand eighty-percent initial solar reflectance.

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The Cittrix Difference

Fast, Convenient Estimates

Call or submit a form and we’ll schedule a free inspection of your roof for the same or next business day. There’s no need for you to disrupt your busy schedule - you don’t even have to be at home.

Instead of sending a confusing estimate or sitting in your living room for hours with a high-pressure sales pitch, we’ll send you a clear video explanation of what’s going on with your roof and our recommendations that you can watch on your own time.
Quick Turnaround and Guaranteed Timelines

Roof installation is scheduled and completed within ten days of approval—no delays, no surprises, just reliable scheduling you can count on.
Flexible Financing Options

We offer simple, clear-cut payment options, including 0% financing with zero money down, making it easy to get the high-quality roof your family needs.
Trusted Team of Professionals
We’re proud to work closely with leading manufacturers, ensuring every roof we install is the highest quality. Our crews are experienced, respectful, and held to the highest standards in the industry—because your home deserves the best.
- Malarkey Emerald Premium Certified Contractor
- Proud Member of the Roofing and Solar Reform Alliance
- A+ rating with the Better Business Bureau
- HAAG Certified Roof Inspector
- 5-Star Google Rating
- 5-Star Thumbtack Professional
Lifetime Roof Warranties

We stand behind our work with robust warranties that cover labor and materials, offering long-term protection and peace of mind.
Speedy Cleanup and Safety Precautions

Our teams take extra care to minimize disruption and keep your family and pets safe during every step of the process.
Locally Owned, Family-Run Business

Based in Buffalo Grove, Illinois, and serving neighbors throughout Lake County and the Chicago suburbs, we’re proud to serve our local community with integrity, hustle, transparency, and heart.

We’ll do everything in our power to ensure you’re informed and confident through every step of the process and will always make recommendations based on what’s best for you. We’re humbled by the positive feedback we’ve received from thousands of happy customers and look forward to serving you and your family.