Underslab insulation

Question

I am planning to build 3.6x6x2.5m SIP board garden office on top of the concrete slab floor without foundation wall and feeting. Concrete slab floor will placed on top of the insulation. Can anyone recomend me the best underslab insulation material/product with high compressive strength and U-value take on heavy weight of whole garden office without foundation wall.

Gary · Accepted Answer

I would recommend Kingspan or Celotex. 

Celotex is a lot cheaper though and just as effective

Mark · Answer

The product would be either "KINGSPAN" OR CELLOTEX. 
Both products will do the job. These products are used in extension floors. It is a point load situation. The sheds weight will be spread over a large area. 150mm of concrete would be ample. Hope that helps.

Tony · Answer

150mil Kingsman and fill what ever joints with expanding foam

Anthony · Answer

Hi it’s definitely got to be Kingspan I’ve used it so many times it’s never had any problems plus make sure you use mesh with spacers

Gene · Answer

100mm jabulite 8x4 boards strap 4x2 timber to make solid and then 8x4 1" ply and finish with your choice of flooring

Underslab insulation

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