Unique collaboration creates innovative offsite system for quickly building homes

18 May 2017

An offsite construction system for new homes that combines elements of traditional build with more innovative approaches has been developed in a unique industry collaboration.

A two-storey SIG I-House can be built from foundations to roof in as little as five days, it is claimed, using the new system developed by H+H UK Ltd and SIG Offsite.

The system incorporates Celcon Elements from H+H, and makes use of timber I-joist cassettes for the flooring, to ensure rapid build-times are maintained.

The system can encompass the inner leaves of external cavity walls, floors, lintel, cavity closers, insulation and roof trusses. With the inclusion of soffit and fascia, the system delivers the internal skin of a property, fully wrapped and ready for follow-on trades, it is claimed.

The system is intended for the construction of domestic houses of up to two storey height, replacing the structure of the inner leaf of external cavity walls, separating walls and internal partitions with storey height Celcon Elements.

Installed by the SIG Offsite team, Celcon Elements are craned into place and fixed using H+H element mortar. Timber I-Joist cassette floors are used in conjunction with the system to maintain the speed of build and roofs are either standard truss construction or the ‘Roofspace I-Roof’ – panelised roof system. All components are raised into position by crane.

Celcon Elements are manufactured from the same intrinsic material as aircrete blocks and have the same performance advantages including excellent thermal performance with reduced heat loss at thermal bridges.