Bath plumbing on concrete floor?

[gavztheouch]

Hi I am building a new build with an insulated raft. There is a bathroom with a bath on the ground floor and the structural slab concrete is the finished floor. I already have my soil pipes and rebar mesh in the isoquick insulated raft but I have not yet poured the concrete. My architects drawing specs a recess under the bath for plumbing. I have watched a few YouTube videos and had a look under my bath in my flat and the water trap does not go below the floor in any of these examples. What is the benefit of having a large recess under the bath. I guess some baths will have very low drain holes I guess that could be an issue.

 

I have one soil pipe next to the bath to accept the water from the bath plus a toilet and sink. Having the soil pipe recessed down inside the 140mm deep recess may give me more run/height for the toilet, bath and sink connection’s especially as I will need some special connection to bring all 3 together.

 

I am hesitant to remove the top two layers of a393 mesh to make the recess in the concrete as it very close to the edge of the slab.

[JohnMo]

For my bath and showers I placed a largish rectangle of insulation where I thought I didn't want concrete for drains. I pinned this the lower insulation and made sure it would be flush with the finished level of concrete.  When I was ready to sort the bathroom wastes I dug out the insulation, did the drains and then back filled those areas with fresh concrete.

[Conor]

Ours was on the first floor, but same principle, we shuttered off the area with timber. This meant a 100mm deep recess for the bath to sit in. Having the bath 100mm lower than then floor level makes it easier to get in and out of. Highly recommended.

[gavztheouch]

  On 09/07/2024 at 05:13, Conor said:

Ours was on the first floor, but same principle, we shuttered off the area with timber. This meant a 100mm deep recess for the bath to sit in. Having the bath 100mm lower than then floor level makes it easier to get in and out of. Highly recommended.

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Thanks Conor, 

 

so you actually lowered the bath/feet/base into the recess, or the recess was for plumbing?

[Conor]

  On 09/07/2024 at 12:12, gavztheouch said:

Thanks Conor, 

 

so you actually lowered the bath/feet/base into the recess, or the recess was for plumbing?

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Dropped the whole lot down