Visqueen contract design service 😮‍💨

[flanagaj]

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.

[ETC]

I think someone’s taking the piss. Contact their local rep. They should be grateful to get the business.

[flanagaj]

4 minutes ago, ETC said:

They should be grateful to get the business.

That was my thought too.

[ETC]

I’ve never had an issue. My rep was always happy to mark up my drawings.

[ETC]

…..in any case your agent should be able to follow the Visqueen standard details……..

[Russell griffiths]

If I’m right you are having a cavity, check the details for this area in particular. 

[Adrian Walker]

Best solution is an insulated concrete slab  IMHO

[Oz07]

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. 

[ETC]

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.

[flanagaj]

17 hours ago, ETC said:

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.

This is an interesting approach.  Given BC have signed off level thresholds around the perimeter of the house, I am keen to understand this detailing further.  It's the detailing with regards to the level threshold that's confusing me.  I did find the below, diagram, but it's for a conventional 150mm lower outside floor level.  

 

 

[Oz07]

This is what I am asking why cant it be done like this? Think @ETC is saying similar?

[flanagaj]

3 hours ago, Oz07 said:

This is what I am asking why cant it be done like this? Think @ETC is saying similar?

It would need some thought regarding the internal sleeper walls as you obviously cannot run the membrane across the whole ground floor area, if you have internal sleeper walls.

[Oz07]

You can if everything is in course. I've done it myself before ontop of b&b with a spine wall. You just lay ontop of the membrane

[ETC]

5 hours ago, flanagaj said:

It would need some thought regarding the internal sleeper walls as you obviously cannot run the membrane across the whole ground floor area, if you have internal sleeper walls.

Yes you can.

[flanagaj]

23 minutes ago, ETC said:

Yes you can.

Do you have a drawing to hand as I am struggling to understand how you do this?  On reflection, is it just a simple case of making sure that the top level of your sand blinding coincides with the top of the block level for your sleeper walls?

[ETC]

[Oz07]

36 minutes ago, flanagaj said:

Do you have a drawing to hand as I am struggling to understand how you do this?  On reflection, is it just a simple case of making sure that the top level of your sand blinding coincides with the top of the block level for your sleeper walls?

Yes. Or even if 25/50/75 mm etc below you can use a sacrificial layer of eps to bring you up to level. I say sacrificial but obvs would be part of your floor insulation.