How to run rad pipes through 80 Celotex?

[DevsAd]

Hi again.

Builder will soon be laying the floor in our new extension. It's currently a concrete slab and he's going to lay a thin (a few mm) of sand on this to level out any imperfections, lay 80mm insulation (I guess will be 'Celotex' type stuff) and then chipboard flooring on top. I need to get a couple of 10mm CH pipes from one side to the other...

How best to do this? It'll be across the middle of the room, so not around the edges.

I'm planning to use 10mm plastic-coated copper tube - it's only going to feed one rad of around 4700btu, and being copper it won't be springy.

My thoughts are to cut a 'V' slot in the top layer to just past half depth, trim around 20mm of the bottom of the removed V sections, lay the pipes and then glue the V back in place, and tapping it down with battens to get it flush. Is that a plan?

If so, would you leave the pipes loose in the slot, or use foam or similar to fill the 20mm void?

Or, what is the correct way to do this?!

Thanks.

 

[Scott_D]

Clip them to the slab in a plastic conduit if you can get in first

 

[DevsAd]

Thanks Scott.

Surely that would mean, tho', that the builder would then have to channel out the underside of the insulation? And the pipes would not be as well insulated either since they'd be close to the concrete slab?

 

[king of pipes]

Pipe in pipe is normal practice as Scott has said, you could however lay a strip of 40mm celotex type insulation across the room fixed down and then lay the 10mm copper plastic coated pipes in this layer tape over with aluminium foil tape, then lay another 40 mm on top this sandwiching the pipework in-between two layers of insulation the remaining 80mm will butt up to this and be taped over. Regards Kop

 

[DevsAd]

Thanks KoP. I think I prefer that idea.