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Posted

We are in a Radon zone and require 'basic' protection.  I contacted Visqueen to ask if they offer a design service, so I can understand the junction details.  They came back an said they do offer a design service and it's £3000.  I'm going to ask if they have added an extra zero by mistake 😂

 

I doubt they have, so I thought I'd ask what did those of you do who also found they needed Radon protection measures.  I might consider an alternative supplier, if that's how they treat potential customers.

Posted

How deep can these radon membranes go. Is there any reason they can't go flat below the insulation layer and just end up with membrane spanning the whole envelope of building. No corners etc. Any spine walls laid on top. 

Posted

Build up the sub-floor blockwork to the underside of the sub-floor.

Fill the sub-floor voids with hardcore (maximum 600mm).

Lay a 1200 gauge membrane - this is the standard gauge required by BC - over the complete footprint of the works.

Overlap and seal all joints in the membrane.

Install top hats to all service pipes and seal the top hats to the membrane and service pipes.

Set up for a 150mm sub-floor slab bearing 100mm minimum onto the sub-floor blockwork.

Place a 600mm wide strip of A252 anti-crack mesh to the perimeter of the works and across all internal walls.

Install a stepped DPC to the perimeter of the works and build as normal.

Membranes to be no lower than 225mm below FGL.

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