New Ground Floor Slab against Existing

[SelfBuildSmurf]

Afternoon all,

I'm having concrete pumped for our new slab tomorrow morning and just had a thought......

Where the new concrete slab butts up against existing structures, i.e. old foundation, external and internal house walls etc. would would it be wise to put in some UFH edge strip to allow the slab to expand/contract? Or just poor it tight to the existing?

On top of the slab will be PIR, UFH and then finished screed.

Thanks

[Nickfromwales]

Is the floor heated? 

[SelfBuildSmurf]

Morning @Nickfromwales,

This is the structural ground floor slab, 

I excavated the existing slab to allow for the new floor build up.

 

Once the slab is down, then it's a layer of PIR across the new slab, existing slab and the B&B floor.

 

Then UFH clipped and screed over the top.

 

As the new slab will be abutting What's left of the walls I've demolished I wasn't sure whether to use the UFH foam to, in a way, decouple the new slab from the existing structures to allow for expansion & contraction.

 

Thanks

[SelfBuildSmurf]

3 Counties Concrete (Herts, Cambs, Beds) We're exceptionally helpful, and we got 6 m3 in, tamped in just under two hours 👍🏼