Design Solution · Structural Systems
Design Solution · Dream about it
Post-tensioned steel tendons within concrete bands embedded in CLT panels extend floor spans ~33% without intermediate columns.
HTFS integrates active post-tensioning into a composite structural layer sandwiched within cross-laminated timber panels, enabling longer clear spans for mid-rise commercial timber construction. It directly addresses the market constraint that standard CLT requires frequent column grids, reducing leasable open floor area and architectural flexibility. The system combines timber's speed and sustainability with steel's span efficiency and concrete's fire/acoustic mass.
DIALOG's Hybrid Timber Floor System addresses a genuine commercial constraint in mid-rise timber construction: standard CLT requires a column grid that reduces leasable open floor area and limits architectural flexibility for office and commercial typologies. By embedding post-tensioned steel tendons within concrete bands inside CLT panels, HTFS extends clear spans by approximately 33%, which is a materially significant improvement in floor-plate planning for open commercial space. The peer-reviewed prototype testing establishes structural, fire, and post-tensioning feasibility in principle, but no deployment reference sits on the record and the cost premium versus conventional CLT or steel-frame alternatives has not been established at scale. The manufacturing complexity is the honest trade-off: post-tensioning installation, concrete curing, and quality control must be integrated into CLT panel fabrication, which reduces the off-site speed advantage that is usually the primary commercial argument for timber construction. Active structural elements — tensioned steel — within a timber composite require ongoing inspection and re-tensioning protocols over the building's service life, a maintenance responsibility that most timber-frame building owners have not been required to manage before. Future adaptability is also constrained: the hybrid composite nature makes floor modifications, openings, and load redistribution more complex and costly than in conventional timber or steel frames. For a design team with a mid-rise commercial timber project and a client brief that requires long-span open floors, HTFS deserves serious structural engineering engagement; the specifier should enter that engagement with realistic expectations about programme, cost, and whole-life maintenance commitment.
Prototype and lab testing (fire, structural, tendon load) documented and peer-reviewed (ASCE Journal of Structural Engineering, March 2023). Large-scale testing (vibration, creep, failure modes) stated to be running at FPInnovations from late 2023. Source URL is DIALOG's own news page; no third-party project case study, building permit, or independent structural certification found. Team's stated timeline for pilot building deployment (6–8 months from late 2023, i.e., mid-2024) has not been corroborated by public records or AEC databases as of May 2026. Patent filing confirmed. System remains in validation phase; no evidence of revenue-generating commercial project or market traction.
#timber #post-tensioning #mid-rise #composite #clear-span #CLT