Prevent Building Envelope Leaks and Costly Rework
Exterior wall assemblies demand continuous moisture and air control. However, these specialized barrier systems often fail due to improper substrate preparation, incorrect mil thickness, or poor detailing around windows and transitions.
As the trusted Tremco installers in St. Louis, Niehaus Building Services permanently seals the building envelope to stop air leaks and prevent structural rot.
Our installations ensure your entire assembly easily passes third-party air-infiltration testing.
Why Choose Niehaus Building Services for Tremco Air & Vapor Barrier Systems?
Certified Tremco Installers
Our team is fully trained in ExoAir fluid and sheet applications to ensure proper adhesion, system compatibility, and full manufacturer warranties.
Framing to Seal Accountability
Niehaus Building Services self-performs the framing, sheathing, and Tremco barrier installation. This unified approach removes the gaps between trades and ensures single-source accountability for your building envelope.
Flawless Transition Detailing
We focus heavily on critical failure points like windows, expansion joints, and pipe penetrations to stop hidden air and water leaks before they start.
NFPA 285 Fire Code Compliance
We build assemblies that meet strict commercial fire safety rules, matching the right Tremco membranes with your specified insulation.
Built for Large Commercial Projects
With a workforce of over 100 union employees, we have the manpower to handle massive commercial, healthcare, and institutional builds across St. Louis.
Over a Century of Local Trust
For more than 100 years, St. Louis general contractors have relied on our field accountability and technical knowledge to deliver durable structures.
Full-Scale Commercial Weatherproofing Services
We install every type of Tremco ExoAir system to control air, water, and vapor movement across all commercial sheathing and masonry.
Vapor-Retarding Barriers (ExoAir 110, 120, 130)
Best for projects requiring an airtight, vapor-locked seal. We apply heavy-duty peel-and-stick sheets and thick fluid coatings to create a continuous, rubberized shield over concrete and sheathing.
Vapor-Permeable Barriers (ExoAir 210, 220, 230)
These breathable sheets and coatings stop liquid water and air leaks while letting trapped wall moisture escape. We use specialized low-temp (LT) versions to keep installations moving safely through freezing St. Louis winters.
Securock ExoAir 430 Panels
We install these glass-mat gypsum panels that come with the barrier factory-applied. This eliminates a step in the field, speeds up your schedule, and guarantees a perfectly uniform barrier thickness.
Flashing & Transition Detailing
We handle the critical tie-ins using matching Tremco primers, sealants, and detail sheets to permanently seal structural transitions, window gaps, and pipe penetrations.
Working with Organizations Like Yours,
Trusted by Leaders Like These
Frequently Asked Questions
Communities We Serve
Our field crews provide on-site commercial contracting and certified installation services across the St. Louis region.
We handle projects throughout the following Missouri communities:
- Maplewood
- Richmond Heights
- Clayton
- Brentwood
- University City
- Rock Hill
- Wellston
- Pine Lawn
- Jennings
- Pagedale
- Webster Groves
- Olivette
- Normandy
- Bel-Nor
- Glendale
Don't see your town listed? See all cities we serve here.