Residential, flat & commercial roofing in Newark, NJ
Guaman Builders LLC is an owner-run contractor at 10 Jay St in Newark, NJ, in business since 2009 and licensed as a New Jersey Home Improvement Contractor (#13VH05637300). We work for homeowners and property owners in Newark and across Essex, Union, Hudson, Bergen, Passaic, Middlesex, Somerset, Morris & Sussex counties, and we speak English and Spanish.
Roof replacement
A full replacement starts with a tear-off down to the deck. With the old shingles gone, the plywood can be checked for moisture, rot and structural problems, and new plywood goes in where it’s needed before anything is installed on top.
Then underlayment goes across the whole deck as a layer of protection beneath the shingles, the new shingles are installed, and the job is finished at the hips, ridges and roof penetrations: a ridge vent along the peak lets warm, moist attic air escape, and flashing around pipe vents closes off common leak points.
Flat & commercial roofing
Not every roof is a pitched shingle roof. Guaman Builders LLC also works on flat and low-slope roofs and on commercial and multi-family buildings, from row houses and two-family homes to storefronts and other commercial properties. We install EPDM and modified bitumen, including torch-down, and we re-roof shingled commercial buildings too.
EPDM rubber roofing
EPDM is a synthetic rubber membrane made for flat and low-slope roofs. It goes on in large sheets, which keeps the number of seams low on a flat roof.
Modified bitumen and torch-down roofing
Modified bitumen is an asphalt-based roofing membrane for flat and low-slope roofs. With the torch-down method, the membrane is heated as it is rolled out so it bonds to the roof and its seams fuse together.
Not sure which system fits your building? Tell us the type and size of the building in the estimate form, or call 973-703-8576, and we will go over the options with your free estimate.
Roof repair & leaks
Leaks, damaged shingles and the problems that keep coming back. If water is coming in now, call us directly at 973-703-8576.
“Luis is the only person fixed my problems … until my neighbors recommended Mr GUAMAN.”
Shingles and manufacturers
Guaman Builders is a GAF Certified™ contractor; you can verify it on GAF’s contractor directory. Our job photos show GAF Timberline HDZ shingles over synthetic underlayment. We also install roofing materials from Owens Corning and TAMKO, and the company holds a TAMKO Pro certification first issued in November 2024 (renewed yearly; current status can be checked on TAMKO.com).
From our job sites
The original roof, worn and ready to come off. Removing it completely is what exposes the deck for inspection. · Posted Oct 2025 
Down to the deck. Exposed plywood can be checked for moisture, water damage, rot and structural problems; new plywood goes in where it’s needed before anything is installed on top. · Posted Nov 2025 
Underlayment across the deck adds a layer of protection beneath the shingles. Bundles are staged on the roof, ready for the next step. · Posted Nov 2025 
Work at the ridge: the slot cut along the peak is for a ridge vent, which lets warm, moist attic air escape. · Posted Jun 2026 
Shingles fitted around a pipe vent. Roof penetrations like this are common leak points, so the flashing around them matters. · Posted Nov 2025 
The new roof on and the crew completing the last details at sunset. · Posted Mar 2025 
Synthetic underlayment down and GAF Timberline HDZ shingles staged on the ridge 
Crew installing shingles on a steep roof, tied off with safety lines 
Ridge cap shingles along the peak 
White membrane in the low section between two shingle slopes 
Black metal coping on a commercial parapet wall
Where we work
From our home base in Newark we serve 49 communities in Essex, Union, Hudson, Bergen, Passaic, Middlesex, Somerset, Morris & Sussex counties. Contact us to confirm service availability in your area.
See the service-area map