The innovative I-House off-site system from H+H and SIG Off-Site gives a huge amount of flexibility to builds - any design alterations required can be easily done on site.

The award-winning system was successfully trialled at Barratt Homes’ 164 unit Norton Farm site in Bromsgrove.

Steve Cartwright, Barratt Construction Director for the West Midlands observed: “It’s simply one of the best offsite systems we’ve seen. It’s basically blockwork erected in a different way which gives us flexibility on site. If you require any design alterations while on site, you can treat it like a traditional build – if you need an additional window suddenly, you can do it, whereas with timber frame you can’t alter this due to the structural calculations changing.”

H+H is UK’s largest manufacturer of aircrete and is committed to modern methods of construction (MMC) that provide cost-effective solutions which make use of the industry’s existing skills base. This is what led to a pioneering partnership with SIG Off-Site to create the innovative I-House system.

The SIG I-House System, based on the storey-high aircrete panels, delivers a complete house shell with weathertight roof and wrapped in insulation in just one week. The system is highly adaptable but in all cases, the Celcon Elements are used for the inner leaf of the cavity walls and for the internal partition walls including separating walls.

Where required, standard thin-joint aircrete blocks are used in combination with the Celcon Elements, allowing the system to accommodate non-standard details such as bays. This solves one of the key criticisms of other off-site methods which require designs to be finalised several months before production.

Requiring just a three-man gang to crane into place, the Celcon Elements are fixed using fast-setting element mortar. The ground floor panels are then supported with props to allow prefabricated floor cassettes by SIG to be fitted and for the second-storey panels to be fixed above the floors. The roof consists either of standard truss construction or the ‘Roofspace I-Roof’ panelised roof system. The SIG I-House System also includes all lintels and cavity wall and party wall insulation.

The award-winning system was successfully trialled at Barratt Homes’ 164 unit Norton Farm site in Bromsgrove.

The Government’s support for off-site manufacturing should be welcomed, however this needs to be balanced with an understanding of the construction industry which is often criticised for being slow to change. The SIG I-House System combines the speed and efficiency benefits of off-site with the traditional methods the industry is comfortable with. To learn more about the system, click 'Visit website' opposite.


The innovative I-House off-site system from H+H and SIG Off-Site gives a huge amount of flexibility to builds - any design alterations required can be easily done on site.

The award-winning system was successfully trialled at Barratt Homes’ 164 unit Norton Farm site in Bromsgrove.

Steve Cartwright, Barratt Construction Director for the West Midlands observed: “It’s simply one of the best offsite systems we’ve seen. It’s basically blockwork erected in a different way which gives us flexibility on site. If you require any design alterations while on site, you can treat it like a traditional build – if you need an additional window suddenly, you can do it, whereas with timber frame you can’t alter this due to the structural calculations changing.”

H+H is UK’s largest manufacturer of aircrete and is committed to modern methods of construction (MMC) that provide cost-effective solutions which make use of the industry’s existing skills base. This is what led to a pioneering partnership with SIG Off-Site to create the innovative I-House system.

The SIG I-House System, based on the storey-high aircrete panels, delivers a complete house shell with weathertight roof and wrapped in insulation in just one week. The system is highly adaptable but in all cases, the Celcon Elements are used for the inner leaf of the cavity walls and for the internal partition walls including separating walls.

Where required, standard thin-joint aircrete blocks are used in combination with the Celcon Elements, allowing the system to accommodate non-standard details such as bays. This solves one of the key criticisms of other off-site methods which require designs to be finalised several months before production.

Requiring just a three-man gang to crane into place, the Celcon Elements are fixed using fast-setting element mortar. The ground floor panels are then supported with props to allow prefabricated floor cassettes by SIG to be fitted and for the second-storey panels to be fixed above the floors. The roof consists either of standard truss construction or the ‘Roofspace I-Roof’ panelised roof system. The SIG I-House System also includes all lintels and cavity wall and party wall insulation.

The award-winning system was successfully trialled at Barratt Homes’ 164 unit Norton Farm site in Bromsgrove.

The Government’s support for off-site manufacturing should be welcomed, however this needs to be balanced with an understanding of the construction industry which is often criticised for being slow to change. The SIG I-House System combines the speed and efficiency benefits of off-site with the traditional methods the industry is comfortable with. To learn more about the system, click 'Visit website' opposite.


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I-House system combines flexibility with tradition