Thin concrete blocks (40mm) as foundation pillars for a garden room

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Hi,

I have a thick & reinforced hardstanding that is going to be used to build a garden room within the permitted development. It was originally intended as a brick garage years ago but was never built. The hardstanding is NOT coming up or being drilled out....

The sub-base for the garden room will be treated timber, but as the hardstanding is relatively flat and much larger than the intended garden room footprint, I was looking at raising the timber off the floor by a small amount. The first thought was to use 7Nm concrete blocks on their side, but 100mm depth plus mortar eats into the 2.5m permitted development height - and every mm counts. I realise that for houses, the minimum height about the ground is 150mm, but this is only a garden room and I have different requirements.

I then came across these "Coursing Slips" (http://www.supreme-ce.co.uk/product/detail/12449) from Supreme Concrete which are intended for block and beam flooring, but for this purpose, they would be absolutely ideal (see example image). At 40mm high + mortar, they would be perfect for this application. The issue is getting hold of them, and in my location (Swansea).

Does anyone have any ideas of stock locally or an alternative? The idea of the plastic ABS pads used in some log cabin type construction fills me with a bit of fear.

Cheers
 

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As above, and also the are Lots of concrete paving slabs are 40mm if that's the depth you are after. You can cut them into strips with a grinder.
 
Oh nice. Sometimes I just overthink. Will check out Marketplace.
 
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