Structural construction adhesives
See also: Mobility
What it is
Structural polyurethane adhesives are used in civil construction and modern industrial construction to replace or complement mechanical fixings in multiple applications: bonding of sandwich panels, fixation of facade elements, assembly of structural frames, bonding of cross-laminated timber elements (CLT/GLULAM), wood flooring installation, fixation of pre-fabricated components.
The global construction trend is industrialization and pre-fabrication — buildings assembled from factory-produced components and bonded/bolted on-site. Structural PU adhesives play a critical role in this trend by offering a unique combination of flexibility (accommodating thermal and structural movement), strength (bonding force sufficient for structural loads) and field applicability (fast cure, humidity tolerance, robotic or manual application).
1K moisture-cure systems are the most popular in field — ready for use, application by tube/cartridge, cure happening in 24 to 72 hours. 2K systems offer faster cure and higher final resistances, but require controlled mixing. HMPUR (Hot Melt Reactive PU) is used in automated manufacturing lines where cycle time is critical.
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Value proposition
Arguments for builders and integrators specifying structural PU adhesives:
- Construction speed: structural adhesives accelerate schedule by 20 to 40% compared to traditional mechanical fixings — critical in tight-deadline projects and modular construction
- Structural quality with clean design: no visible bolts, facades with minimal joints, Class A aesthetics — differentiator in premium commercial construction and modern architecture
- Accommodation of thermal and structural movements: PU flexibility absorbs deformation of large panels without compromising fixation, avoiding cracks and infiltrations
- Enabling pre-fabrication: technologies such as cross-laminated timber (CLT), metallic sandwich panels and ventilated facades depend on structural adhesives for factory or field assembly
- Certifications as legal protection: adhesives with documented ETAG 002, EN 15651 or ABNT protect builders in facade failure litigation — history of incidents like Grenfell Tower has made this point unavoidable
- Multi-substrate compatibility: effective bonding of combinations impossible with mechanical fixation (glass on metal, wood on concrete, composites on existing structures)
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Related applications
Insulated metal roofing (sandwich panels)
PUR/PIR system · PIR system
Sandwich panels for industrial walls and roofs
PUR/PIR system · PIR system
Closed-cell spray foam insulation
Closed-cell spray foam 2K system · Open-cell spray foam 2K system (water-blown)
Roof and slab waterproofing
1K liquid PU membrane · 2K liquid PU membrane