999 damp reading in ground floor

FreeBear

Sage01 said:

FreeBear said:

stuart45 said:

Early 60's probably won't have a DPM. In most houses it's not a problem, but with a high water table it can be.

Won't have any insulation in the slab either. Digging out the concrete provides an ideal opportunity to add loads of insulation and install underfloor heating.

That's a great idea, I'll have to look into this, any idea on rough pricing for this work would be greatly appreciated!

Absolutely no idea as to costs. Materials have gone up by stupid amounts over the last couple of years, and many tradesmen have doubled the rates they charge. So what might have been an £8K job a few years ago could quite easily be £18-20K now.

stuart45

You could easily be looking at £20,000 plus.

Chemistry777

We had sulphate attack and damp in the house we bought in 2023.   We knew before we bought and got the work done before we moved in (took 4 weeks).   It was a bungalow, so reasonably large footprint needed doing (100m2) and it cost me £22k.  Specification of work below.  

To remove and replace the existing concrete floors and hardcore to the following specifications-

Take up carpets and carefully store.

Break up concrete floors in the Hallway, Lounge, Dining Area, Study, Bathroom and 2 Bedrooms.

Excavate to a depth of 600mm. This depth is the recommendation of our Approved Building

Inspector.

Refill where hardcore has been removed with clean sulphate free hardcore compacted in 150mm

layers.

Provide and lay a 1,200g (300mu) polythene (LDPE) damp proof membrane and 75mm ‘Celotex’

or similar PIR under-floor insulation, including 25mm ‘Celotex’ or similar upstand at external floor

edges. Lay 500g Vapour Control Layer over insulation.

Lay new concrete floor slab throughout, approximately 100mm in thickness.

Lay new sand and cement floor screed throughout.

Prior to commencement of works, remove the existing internal doors, carefully store and refix on

completion of new floors.

Upon completion the site will be left in a clean and tidy manner.