Precast concrete Floors

THE DON FANUCCI

Lads, planning application is gone in. should know the result in the next few weeks.
going putting in concrete hollowcore on first floor as opposed to timber joist. A few quick questions about these.

1) Do I need to pour concrete floor screed on top of the slabs? on top of the pipes for rads,en suite etc?

2) do I still need insulation at ceiling level under the hollowcore slabs?
3) heard of suspended metal ceilings under the slab, are these good option?

any help is appreciated

Metric Tensor

1. Yes

2. No.

3. Yes

Don't forget to leave enough space for your HRV ducts in your ceiling void!

THE DON FANUCCI

Metric Tensor wrote: »

1. Yes

2. No.

3. Yes

Don't forget to leave enough space for your HRV ducts in your ceiling void!

But if I'm not going for HRV I don't need to leave a big space do I ?

How do I pour concrete up on the second floor?? hire in a specialist? I'm going direct labour on this job.

Does anybody know if two precast slabs are sitting end to end on one wall does this wall need to be a block on flat ??

Metric Tensor

In my opinion you should be installing HRV but I won't get into that here. There's a big long thread from a few weeks back that you should read. I can't link it because I'm on a mobile but you'll probably find it if you look back. How does the person doing your Part L calculation feel about it?

Get the same person to do it as is installing your ground floor screed. The techniques are pretty much the same.

Ask your structural engineer about the walls. He/she will be checking the hollowcore design loadings from the manufacturer anyway and will also tell you which span directions are best and what supports are needed. You should also get your engineer to talk to the screed installer about the appropriate way to install shear keys and the lateral tying requirements of the floor.

BryanF

we cannot offer structural advice OP, the support of your structural floors must be designed by a structural engineer

THE DON FANUCCI

BryanF wrote: »

we cannot offer structural advice OP, the support of your structural floors must be designed by a structural engineer

How does one wrap the end of concrete slabs with membrane if they are laid straight from the truck onto the house? Will the precast company design what direction the slabs will lie ?

mfceiling

Your engineer/architect will design your wall build up which will dictate the direction of the hollowcore. The membrane should be in place before they install the hollowcore. Be careful they don't tear it when installing it.

If you do a search here for "SAS membrane" you will find a poster here who provided a great detail for this problem along with some great photos.

THE DON FANUCCI

Can I build block wall on second floor on top of concrete slab? Instead of timber partition stud walls ? even if it's not directly over a ground floor wall

hurikane

You really need to talk this over with an engineer. This is not something random people on the internet should be advising on.