HTL.tech completes 3D printed social housing in Ireland Materials

Harcourt Technologies Ltd (HTL.tech), a construction 3D printing technology company in Ireland and the UK,

The ISO/ASTM 52939:2023 standard ensures 3D printed structures meet the same benchmarks as traditional methods – establishing 3D construction printing as a recognized building technique. This achievement earned HTL.tech the Standards Innovation Award from the National Standards Authority of Ireland (NSAI).

“This honor recognizes HTL.tech’s exceptional integration of standards into HTL Technologies’ processes for 3D house construction printing. Their innovative efforts are helping to position Ireland as a leader in this field,” said Geraldine Larkin, CEO of NSAI.

The project in Grange Close, Ireland, features three 110m² (1,184ft²) apartments – totaling 330m² (3,552ft²). It was completed in just 132 working days – a 35% reduction in build time compared to traditional methods. Half of the time savings came from 3D printing the wall system, while the precision of the technology streamlined the integration of other components – enhancing overall efficiency.

“HTL.tech is extremely proud to be the first in Europe to build a structure compliant with the I.S. EN ISO/ASTM 52939:2023 standard. The COBOD BOD2 3D printer was crucial in completing the Grange Close Social Housing Scheme 35% faster than traditional methods. This accomplishment sets new industry benchmarks and offers a sustainable, accelerated approach to housing construction,” said Justin Kinsella, Director of HTL.tech.

The load-bearing wall system, compliant with Eurocode 6 masonry standards, features two 10cm (3.9 inches) concrete walls with a 150mm cavity – eliminating steel reinforcement. The project used 90m³ (3,718ft³) of high-strength concrete (47MPa).

COBOD also upgraded the BOD2 printer’s concrete hose to a 65mm diameter during the project – increasing output by 40%. With this upgrade, HTL.tech anticipates reducing printing times for similar structures from 12 days to just 9 days.

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Author: Edward Wakefield