Viability of using two different floor build ups next to each other.

[G and J]

In about a month (fingers crossed) I’ll be standing on a cleared site looking at the ground we will be building on.  At that point we will know so very much more, and will have the evidence on which to base decisions about the form of foundations and floor building up.  

 

Until then I’m trying to predict most likely scenarios and appropriate responses to those scenarios. 

 

I’ve posted separately about shallow drains and minimum falls and levels. That thread has concluded that I may be able to have a bnb floor where my drains run.  But…

 

The drains are all in the front half of the house.  The ground slopes down towards the back of the house.  BnB was the preferred option as it sidestepped the need for loads of sub floor build up. 
 

So…

 

Is it ok to have solid floor for the shallow half of the house and BnB for the other, deeper half?  The required foundations lend themselves to that, just a single (but aesthetically important) doorway crossing that boundary. 

Edited March 5 by G and J
Typos…

[G and J]

PS - we would of course have the same insulation and screed/constructional slab above both halves…

[Bonner]

Yes, we have a combination of solid floor and B&B. Due to cock up we ended up with a step but easily levelled up with additional 25mm insulation on the low side. Continuous screed throughout.

[G and J]

  On 05/03/2025 at 09:08, Bonner said:

Yes, we have a combination of solid floor and B&B. Due to cock up we ended up with a step but easily levelled up with additional 25mm insulation on the low side. Continuous screed throughout.

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Thank you.  That’s exactly what I wanted to hear. 

[Nickfromwales]

Just keep an eye on how the DPM is detailed at the junction of the 2 founds. 
 

When you get some drawings, post them up so we can chew the fat. 👌

[G and J]

Will do.