This foundation system is unlike the traditional Irish foundations. The Supergrund system is a Swedish design manufactured by Aeroboard Ireland. This system works on the concept of wrapping the entire concrete slab in insulation.
Along the perimeter of the foundation is a high strength "F Profile" insulated (EPS 300) ring beam with the enclosed area being filled with between 300 - 400mm of EPS 100 insulation; ensuring that the entire slab is wrapped in insulation, eliminating thermal bridging (typical u-value 0.100-0.155 W/m2K) and also protecting the structure from moisture.
As this foundation system is relatively new to Irish construction; I feel it is crucial to develop your knowledge of it by portraying the steps involved in the construction process:
The first step involved in this process is to simply compact the hardcore.
Next the radon barrier is installed; followed by a 30mm layer of sand binding.
Once this is complete the installation of F profile ringbeam former can begin.
Once the ring beam former is installed around the perimeter the sand binding can be
raked level; in preparation for laying the EPS 100 insulation.
The enclosed area can then be filled with 100mm thick EPS 100 insulation.
Typically 300mm - 400mm of EPS 100 is installed.
Once the EPS 100 is installed, work can begin on the ringbeam itself.
Ø12 steel reinforcement is inserted into the F Profile.
This reinforced steel is supported by stainless steel ties.
Next the steel reinforcement for the slab is installed in the enclosed area.
Note: in this image underfloor heating pipes are tied to the steel.
The final step is the pouring of the foundation.
Below is a simple cross-sectional view of the Supergrund System.
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