Structural Waterproofing Membranes for Boston Projects
When a foundation, plaza deck, or underground structure needs to stay dry for decades, MasterSeal is the engineered membrane system. We install BASF MasterSeal with full protocol compliance, from substrate prep through protection layer, backed by system warranty and documentation.
MasterSeal is BASF's answer to structural waterproofing where failure is not an option. Multi-storey buildings with below-grade levels, occupied plazas sitting atop parking or mechanical space, underground structures and tunnels, foundation walls in high water-table zones: these are the applications where the membrane has to function for the life of the building.
We install as a BASF-system installer, meaning we follow the full protocol: substrate assessment, primer selection, membrane application at engineered thickness, joint detail execution, and protection layer installation. The system warranty is contingent on that protocol; we document every step.
On projects with BASF MasterTop floor systems or Sika waterproofing elsewhere on the scope, we coordinate the membrane transitions. For equipment grouting, MasterFlow integrates with the structural slab.
Recent work
Installation sequence
How MasterSeal Installation Unfolds in Boston
Assess substrate and select product
We evaluate the concrete surface, water exposure, and structural assembly to confirm which MasterSeal variant (sheet, liquid-applied, or hybrid) matches the engineer's spec and site conditions.
Prepare surface per BASF standard
Concrete is cleaned, cracks are routed and filled with compatible repair material, and all joint areas are isolated and prepped for membrane installation.
Apply primer and membrane
BASF primer is rolled or sprayed, then the MasterSeal membrane is applied at the specified thickness with full coverage at all penetrations, joints, and transitions.
Install protection and document
Protection layer (board, geotextile, or concrete) is installed where required by spec. The system is photographed and documented to support warranty registration and structural review.
Engineering coordination
MasterSeal Works Within Structural Specifications
Most MasterSeal projects involve a structural engineer because the waterproofing is part of the load-bearing assembly. The engineer specifies the product, thickness, joint detail, and protection layer; we execute to that spec and provide documentation that satisfies structural review and warranty requirements.
System types, structural engineer coordination, warranty and protection.
Below-grade structural waterproofing on commercial or institutional projects, plaza decks over occupied space, and any application where the engineer specifies BASF. We install when MasterSeal is specified rather than recommending it over alternatives.
Most MasterSeal projects do, because they involve structural assemblies. The engineer specifies the product and the install detail; we deliver to that spec with documentation.
For below-grade and traffic-exposed applications, yes. The membrane needs physical protection from backfill or traffic; the protection layer is what keeps the membrane functional through service.
Yes, system warranty applies when installed by a BASF-system installer to BASF spec. We deliver the documentation that supports the warranty submission.
Depends on area and system. Foundation walls can be done in days; large plaza-deck systems with multiple layers stretch over weeks. The schedule is in the quote.
MasterSeal below-grade install on a structural foundation. Documentation supported the engineering review, install passed inspection. The system path was clean from spec through warranty.
Z. G6
Structural Engineer, Boston
★★★★★
Plaza deck MasterSeal with multiple protection layers. They knew the BASF protocol cold, joint detail at every transition. Holding through full traffic exposure.
Y. G6
GC, Cambridge
★★★★★
Structural waterproofing with BASF spec on a complex below-grade project. The install matched the spec, documentation supported the audit. Real engineering-grade work.
Q. G6
Engineer, Somerville
★★★★★
Below-grade MasterSeal across a foundation, full system warranty in our project file. Dry through three springs of melt. Worth doing right at structural scale.
X. G6
Property Developer, Quincy
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