Firestopping for Denver-area general contractors since 2007.
Family-run and women-owned. UL Qualified Firestop Contractor, certified MWBE, SBE, and DBE for city and federally funded projects.
115+ projects completed 2007 year founded
MWBE · SBE · DBE
City and County of Denver, U.S. DOT
UL Qualified Firestop Contractor
Audited installation program
Family-run, women-owned
Roots in Denver's Swansea & Elyria
Fireproofing Supervisor License
Required for Denver city inspections
What we install
Intumescent paint
A coating that swells under heat to protect structural steel, applied to the thickness the rating calls for.
Fire-rated joints and penetrations
Sealing the openings where pipes, conduit, ducts, and cables pass through rated walls and floors.
Specialty solutions
Endothermic mat, pillows, bricks, and other products for cable trays, large openings, and conditions that standard sealants do not cover.
Projects we have been part of
One River North
Apartment tower · 3930 Blake St, Denver
General contractor: Greiner
Coors Field
Ballpark · 2001 Blake St, Denver
General contractor: Shawmut Design & Construction
Block 162
Office high-rise · 675 15th St, Denver
General contractor: Bergelectric
"On The Spot Firestop has been our trusted firestop contractor on numerous complex projects in Denver. Their consistent quality, professionalism, and technical expertise make them a top choice."
— Confluence Builders
What general contractors say
"Gilbert and the entire team at On the Spot Firestop have been incredibly helpful and reliable. They’ve completed numerous projects for us, and we’ve always been impressed by their knowledge, punctuality and quality of work. It’s comforting to know we can count on their team to get the job done right. We’re truly grateful for all their hard work and highly recommend them!"
— Slater
Project Coordinator
CODA Construction Group, LLC
Have a project out to bid?
Send plans, specs, and your bid date. We will get back to you with a number.
On the Spot Firestop
Firestopping subcontractor serving general contractors across the Denver metro area.
UL Qualified Firestop Contractor · MWBE · SBE · DBE
Contact
Services
gilbert-herrera303@hotmail.com
Commerce City, CO
720-298-0244
© 2026 On the Spot Firestop. All rights reserved.
