Living with insulated precast concrete

28th November, 2019

With two key projects under the spotlight, we hear more  about Spantherm – the innovative insulated precast concrete ground-floor system which is being adopted by a growing  number of housebuilders and developers. 

Spantherm is an insulated, precast concrete flooring system designed specifically for residential and commercial ground-floors. By producing high performance insulated structural concrete units offsite Creagh have redefined the speed of installing a fully insulated ground-floor. This is the next generation of structural flooring systems designed as the efficient alternative to labour intensive beam and block installations Creagh's Spantherm thermally efficient flooring has been utilised at a housing development in Warmington, Peterborough.

The 11 new homes development is being built by NRI Civils and will be ready by the end of 2019. NRI Civils choose Spantherm insulated precast concrete flooring system as it is designed specifically for use at ground-floor level in residential and small-medium sized commercial projects. They opted for the work to be completed by Creagh's expert fitting team, requiring no labour from them and saving them time onsite.

Adam Moody, Contracts Manager for NRI Civils said: "We chose Spantherm because one of the things that we are looking for as a business is to improve efficiencies, reduce costs, reduce labour and time onsite and when you've got a difficult site, where you're struggling for storage, that's exactly where Spantherm is perfect."

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Housebuilders are increasingly exploring the opportunities for new ideas to reduce labour onsite and boost efficiency in the build and it makes sense that they start with the ground-floor. Spantherm is installed in just minutes – not days. By producing high performance insulated concrete units offsite Creagh have redefined the speed of installing a fully-insulated floor.  The initial appeal of Spantherm is clear, as a typical floor on a detached house or a pair of semi-detached homes is fitted onsite in less than two hours. Once in place and grouted, the floor achieves its full structural capability within 72 hours, however building activity can commence on perimeter walls within 24 hours.

"The team have been absolutely fantastic with the support we get," adds Adam. "Anything that we need to discuss with them, they are always on hand, so we have a great relationship.  We will definitely be using Spantherm again to help our optimum goal of achieving better efficiency and reducing costs and labour times." Creagh's Spantherm thermally efficient flooring has also been used to great effect being at a housing development in North Muskham, Nottinghamshire, where a 16 new homes development is being built by Geda Construction. With no additional site works or laying out required, a typical 90m². 

A Spantherm ground-floor can be installed in just 90 minutes and provides level base without camber for timber frame or block construction. Installation is not affected by adverse weather conditions and secondary screeds with extended drying times are not required. Spantherm is designed to reduce cold bridging at wall/ floor junctions making an important contribution to Part L performance. Spantherm is available in 3 performance options designed to boost your building's performance within SA and an achieve U-value as low as 0.12W/m2K. It is also a fabric first solution, integrating structural concrete with expanded polystyrene insulation.

The tightly butted units lock in the thermal performance efficiently across the slab. "Geda used Spantherm to push the project along as its one operation that just makes it so much quicker and easier to facilitate onsite," said Shaun Wormall, Site Manager for Geda. "We are impressed on the installation of the slabs and the time that it saves us onsite. From a site management point of view it's been really good, Creagh have been very responsive and the production timescales and installation has been quick and painless.  We would definitely use Spantherm again, brilliant product, well-managed and well-run."  For more information visit: or email:

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