Concrete floor pouring advice

[Mr Punter]

21 minutes ago, saveasteading said:

BUT seriously consider postponing this and getting a professional gang to do it.  

+1

 

Because you have a series of small rooms, this job looks difficult.  Get several quotes for someone skilled and experienced to do the job.

[Nickfromwales]

I’ve been at this for > 30 years, and my ass still goes through various differing diameters whilst the wagons are backing up; at that time the opportunity to check / change anything has completely evaporated.

 

 

[Coll659]

Thank you so for the responses. Definetley confirming my thoughts on how difficult it will be. I'm working my way through all the points one by one so will likely be back back with me questions. We have a couple more semi experienced people on board and are in the process of trying to get a professional or two to come as well. And just planning everything to the tiniest detail. I've lost many hours sleep to this recently and really appreciate the advice. We have some phone calls to make next week and see what we can figure out

[Mike]

I wouldn't attempt to do what you're planning either. If the rooms were larger I'd probably spread it over 3 days and, instead of pumping it, I'd shoot it in through the windows and have at least 2 people with muscles to barrow it into place. However as the rooms are smaller I'd probably bring in the materials and mix it on site.

 

On 11/09/2025 at 12:28, Coll659 said:

How do I make joints between the rooms taking into account there will be underfloor heating pipes going through doorways. Should the slabs be completely separate for each room to avoid cracking and allow expansion?

I'd have formwork in the doorways and create expansion joints. Either way, shroud the UFCH pipes with lengths of flexible conduit for 250mm or so either side of the junction, so that any movement is isolated from the pipes; if you've missed them out you can slit them lengthwise and clip them over the pipes, then tape up the slit.

 

 

[Nickfromwales]

54 minutes ago, Mike said:

I'd probably bring in the materials and mix it on site.

Ouch!

 

Ready mix all day long, even if barrowed in.