Curtainwall & glazing joints
Structural silicone and perimeter polyurethane sealants accommodate thermal cycling on aluminum and glass while UV stability protects exposed beads on high-rise facades.
Transformation cases
How Spec Chemistry Changes Field Outcomes
Curtainwall movement class lock-in
Background: a Midwestern 42-story tower entered bid with generic “sealant” callouts and no ASTM C920 class. Process: the facade consultant required peel adhesion tables on aluminum and glass before approving Spectrem structural silicone and Dymonic perimeter SKUs at ±50% movement. Result: the opening submittal cleared without a second chemistry rewrite, and joint width-to-depth notes traveled into the shop drawings for the certified applicator.
Deck coating moisture protocol
Background: a university parking structure saw blister callbacks after a prior coating season skipped moisture verification. Process: the team adopted Puma primer checks against the TDS moisture / RH caps before aggregate broadcast on vehicular ramps. Result: blister callbacks dropped across two winter salt seasons while published abrasion resistance and wet slip resistance coefficient targets remained in the O&M file.
Air barrier continuity at openings
Background: a healthcare campus energy model assumed continuous air barrier performance at punched openings. Process: ExoAir 230 transition membranes and primers were detailed at every window, with acoustical sealants where demising walls carried STC rating targets. Result: air permeability stayed on the ASTM E2178 pathway used in the model, and open-wall UV windows were scheduled so exposure did not exceed the TDS clock before cladding.
Natural versus engineered cladding debates often arrive late—after the air barrier plane is already designed. Tremco teams document how sealant substrate adhesion and moisture vapor transmission change when teams switch from masonry to metal panel rainscreens. Sustainability premiums versus budget reality show up as coating thickness debates on parking decks: thicker wear coats raise abrasion resistance and service life expectancy, yet value engineering may push thinner systems that still meet minimum slip resistance coefficients. We keep those conversations numeric—deck substrate compressive strength in PSI where relevant, published elongation, air permeability targets near ≤0.04 cfm/ft² when continuous, and warranty pathway requirements—so owners can choose knowingly. Immersion joints, chemical splash, and UV-expired open walls remain outside standard SKU assumptions.
