Building enclosure testing confirms that walls, windows, roofs, and joints perform the way they were designed to before problems reach the field. G&W provides field and laboratory testing for air, water, structural, and material performance across the full envelope, supporting compliance, quality assurance, and dispute resolution.
G&W performed enclosure testing before expanding that practice in 2025 with the acquisition of Mid America Testing Labs, a pre-construction mock-up testing lab operating since 1982. The addition brought decades of testing experience and accreditation under the G&W roof. Our testing is accredited by AAMA, ASTM, NWWDA, and NAFS.
St. Louis, MO
Des Peres, MO
St. Louis, MO
A roof is the most exposed and most expensive system on a building to get wrong. G&W provides roof consulting and design backed by Registered Roof Observer (RRO) credentialed staff and in-house structural engineering, so roof decisions account for the structure underneath them. We assess existing roofs, design replacements and new systems, and stay involved through installation to confirm the work matches the design.
Our condition assessments combine infrared scanning and drone inspection to reach difficult areas safely and locate trapped moisture and hidden deficiencies that drive premature failure. The result is roofing that reaches its intended service life instead of failing early.
Creve Coeur, MO
Des Peres, MO
When a building leaks, sweats, or loses energy through the envelope, the visible symptom is rarely the source. G&W investigates water intrusion, air leakage, and envelope failures using a structured methodology built to hold up under scrutiny, including in litigation. We combine industry-standard testing protocols, infrared imaging, drone inspection, and targeted diagnostics to find the actual cause, not just the obvious one.
Each investigation ends with practical, defensible corrective recommendations. The goal is to restore enclosure integrity and reduce the risk of the problem returning.
Webster Groves, MO
The cheapest place to fix an enclosure problem is on paper. G&W reviews drawings, specifications, and submittals before construction, focusing on the transitions and junctions where air, moisture, and thermal performance most often break down. We flag vulnerable details early, while a change still costs a redline instead of a callback.
This review strengthens coordination between trades and adds a layer of quality assurance that carries through construction.
Fischers, IN
