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Gilrace Masonry Boston · Since 1995
EPA Lead-Safe Certified Firm · BBB Accredited Business A+ · Google 5-Star Rated
Licensed · Insured · OSHA-Compliant · 30+ Years in Boston
Trusted by Peabody Properties · Abrams Mgmt · Dorchester Bay EDC · SCJ Properties
Commercial Waterproofing Contractor · Boston

Commercial Waterproofing & Building Envelope in Boston Air Barriers, Membrane Systems, Brick & Concrete Sealants, Below-Grade Waterproofing. Licensed, Insured, Portfolio-Proven.

30+ Years in Boston Building Envelope Specialists Membrane System Certified Portfolio & References
MA CSL #CS-091258  ·  Fully Insured  ·  COI Available on Request  ·  W-9 Ready
Call Our Envelope Desk (857) 855-2070
✓ COI & License on file ✓ Same-day callback ✓ No-cost site visit
Scope & Credentials

Sized for Real Envelope Work

30+
Years in Boston
100+
Multifamily & Commercial Projects
Multi
Membrane Systems Certified
5-Yr
Warranty in Writing

From single-elevation sealant work to full building envelope restoration. Brick and concrete sealants, air barrier installation, below-grade waterproofing, plaza and parking deck membranes, parapet flashing, and through-wall flashing remediation.

Why Pick Gilrace

Why Boston Owners & PMs Pick Gilrace for Envelope Work

Diagnose Before You Spend
Most leaks are misdiagnosed. Water entering a basement rarely starts at the basement. We trace the actual entry point (parapet flashing, failed sealant, brick saturation, foundation crack, window perimeter) before pricing the fix so you're not paying to seal the wrong surface.
Membrane & Sealant System Experience
Henry Blueskin WP 200, fluid-applied air barriers, self-adhered membranes, Loxon and Loxon XP, silane-siloxane brick sealants, below-grade waterproofing systems. We pick the right system for the substrate and exposure, not the one the salesman pushed.
Procurement-Ready, Architect-Friendly
MA CSL #CS-091258. COI, W-9, and references with your bid. We work directly with building envelope consultants, preservation architects, and property managers across Boston. Documentation, submittals, and warranty paperwork delivered with the proposal.
Portfolio Work

Restoration & Waterproofing · Peabody Properties, Braintree

Ongoing restoration and waterproofing by Gilrace Masonry at Peabody Properties, 536 Granite Street, Braintree MA
Ongoing brick restoration and envelope waterproofing at Peabody Properties, 536 Granite Street, Braintree. Same scope and methodology we use on multifamily envelope projects across Boston, Cambridge, Brookline, and the South Shore. Clients include Peabody Properties, Abrams Management, Dorchester Bay EDC, and SCJ Properties.
How It Works

From Bid Request to Scheduled Work

1

Submit Scope

Share the building, the leak symptoms, and any existing reports (envelope surveys, engineer assessments, prior contractor notes) via the form or to info@gilracemasonry.com. We respond within one business day.

2

Diagnostic Site Walk

A Gilrace envelope lead walks the property, traces the leak source, documents substrate conditions, and identifies the right membrane or sealant system. Written scope with itemized pricing, schedule, and compliance docs (COI, W-9) follows within 3-5 business days.

3

Coordinated Installation

We coordinate with your facility team, building envelope consultant, architect, and any ongoing trades. After-hours and phased schedules standard for occupied buildings.

Envelope Capabilities

Full-Scope Building Envelope & Waterproofing

Air & Vapor Barriers
Henry Blueskin, fluid-applied & self-adhered systems
Brick & Concrete Sealants
Silane-siloxane, Loxon, elastomeric coatings
Below-Grade Waterproofing
Foundation membranes, drainage, dampproofing
Parapet & Flashing
Through-wall flashing, coping, parapet stabilization
Leak Diagnosis
Source tracing, water testing, envelope survey
Historic & Brownstone
Lime mortar repointing, MHC-compliant envelope work
Recent Boston Work

Some of Our Recent Jobs

6000 SF of historical restoration at Royal Worcester Apartments
Royal Worcester Apartments · 6,000 SF Restoration
Historical restoration and waterproofing at the Aurora Building
Aurora Building · Historical Restoration
Restoration and waterproofing at Peabody Properties building, Braintree MA
Peabody Properties · Braintree Portfolio
Historical restoration at Lionhead Apartments, Dorchester MA
Lionhead Apartments · Dorchester
Brick re-pointing and restoration at the Marriott Custom House, Boston
Marriott Custom House · Boston
Historical restoration and waterproofing on Columbus Ave, Boston
Columbus Ave · Restoration & Waterproofing
What Boston Clients Say
30+
Years Serving Boston Portfolios
Hundreds of thousands in work for Peabody Properties · BBB A+ · 5.0 ★
★★★★★
"Gilrace is a real partner in our portfolio asset preservation program. Keeping our buildings watertight and standing long into the future. Great work ethic, careful around tenants, and we've trusted them with hundreds of thousands of dollars in projects."
— Scott F. Ployer, CPM®
VP Facilities & Capital Planning
Peabody Properties, Inc.
★★★★★
"Gilrace did significant emergency stabilization on our historic office building. Reasonable, timely, and professional through the entire process."
— John Mahony
Dorchester Bay Economic
Development Corporation
★★★★★
"I've worked with Gilrace for years on masonry, historic, and waterproofing projects. They respond quickly to emergencies, no issues with callbacks, and their pricing is competitive. I recommend them without hesitation."
— Ivana Leslie, CMM, CFM
The Abrams Management
Company, Inc.
Quick Answers

Before You Call

How do you find the actual source of the leak?

Most leaks show up far from the actual entry point. Water travels along framing, behind brick veneer, and through mortar joints before it surfaces. We start with a visual survey of the exterior envelope (parapets, sealant joints, brick, flashing, windows, foundation), then test suspect areas with water testing or moisture metering when needed. The fix gets priced against the real source, not the symptom.

What membrane and sealant systems do you install?

Henry Blueskin WP 200 and other self-adhered air/vapor barriers, fluid-applied air barriers, modified bitumen below-grade membranes, silane-siloxane brick sealants, Loxon and Loxon XP elastomeric coatings, and traditional through-wall flashing. We match the system to the substrate, exposure, and warranty requirements rather than installing whatever's in the truck.

Can you coordinate with our building envelope consultant or architect?

Yes. We work directly with envelope consultants, preservation architects, and engineering firms across Boston. We can install to your existing specs, provide submittals for review, and follow your QA/QC protocols. If you need an envelope consultant before scoping, we can recommend trusted Boston firms.

What warranty do you provide on waterproofing work?
5-year workmanship warranty in writing on all waterproofing installations. Manufacturer warranties on installed products (Henry, Sherwin Williams, etc.) run separately and typically range 10-20 years for major membrane systems. We document both with the proposal so you know exactly what's covered and for how long.
Do you handle below-grade waterproofing and foundation work?
Yes. Stone foundation repointing, modified bitumen and self-adhered membranes on poured walls, foundation crack injection, drain board and protection board installation, and exterior dampproofing. We coordinate with excavation contractors when the work requires it.
What insurance and references can you provide?
MA CSL #CS-091258. General liability, umbrella, workers' comp, and commercial auto coverage. COI on request with named certificate holder. References from prior envelope and waterproofing clients including Peabody Properties, Abrams Management, Dorchester Bay EDC, and SCJ Properties available with the bid.
How do you work around occupied tenants and active operations?
Tenant notices coordinated with your facility team, staged material handling, dust and odor controls for interior membrane work, after-hours and weekend schedules when needed. We don't disrupt egress, parking, or building operations unless we coordinate it with you in writing first.

Ready to Scope a Waterproofing or Envelope Project?

Submit the form above for a written response within one business day. Or call our envelope desk directly to discuss diagnosis, scope, and membrane system options.

Speak With Our Team (857) 855-2070
✓ Source diagnosis before pricing ✓ Membrane & sealant system options ✓ Site visit & written scope within 5 days
Service Area

Waterproofing & Envelope Work Across Greater Boston

Serving Boston and surrounding metro: Cambridge, Brookline, Somerville, Newton, Quincy, Dorchester, South Boston, Jamaica Plain, Roxbury, Milton, Medford, Braintree, and beyond. Multifamily, historic, institutional, and portfolio work throughout the Boston DMA.

Envelope Inquiries · (857) 855-2070