Damp proof course quote

JT1987LBN

Is the following fair for a damp proof course to be added to a bungalow, 850 square foot. £3950 inc vat for the following:

Roughly 54 linear metres of DPC cream to be injected (this is usually done into the mortar joints to stop rising damp every 100mm along the damp proof course bricked area)

Your quotation includes the installation of 11 linear metres of ACCO drain, and 3 gully's.

Diverting the rainwater pipe into the foul water and installing a new downpipe into the soil vent pipe and breaking out and removing a concrete step.

We are hoping this is a fair quote. Thank you.

neilmcl

Don't do it!

Chemical DPCs are one of the biggest rip offs in the building industry. You don't have rising damp you may have an issues somewhere with water ingress so find and isolate that problem. Who told you you needed a DPC treatment?

JT1987LBN

A building company who claims to have experience with the type of water ingress we have. The bitumen damp course was laid too high. You can see the bitumen damp course layer about an inch above the floor in inspection holes I've made in several rooms, water is seeping in underneath it, through the plaster and into the skirting board.     

FreeBear

JT1987LBN said: Your quotation includes the installation of 11 linear metres of ACCO drain, and 3 gully's.

Diverting the rainwater pipe into the foul water [sewer]

Rainwater should be directed in to a dedicated soakaway and should only go in to a foul water sewer if there is no other option. If you can avoid using a sewer for rainwater, there are savings to be had on your water rates and it also helps to relieve the pressure on the sewer system during heavy rain.

For reference, photos of the problem wall here - https://forums.moneysavingexpert.com/discussion/6195105/rising-damp-or-lateral-ingress

In your shoes, I would sort out the exterior ground levels, and install a French drain. Monitor the situation over winter and then consider your options next spring. One possible answer is to lay a damp proof membrane over the floor after cutting the plaster away from the bottom ~100mm or so. Ensure that the DPM goes up the wall to cover the existing DPM, put a screed down on the floor and then replaster.

Injecting "stuff" in to the walls is unlikely to fix the current problem.

JT1987LBN

Thanks FreeBear and Neilmcl. I think I'll take your advice and tell the "damp man" we wont be needing his services. We have another couple of groundworks companies coming to quote us so I'll tell them exactly what we want rather than being led astray again. A camera probe has just arrived so I may be uploading some images onto this forum link:
https://forums.moneysavingexpert.com/discussion/6195105/rising-damp-or-lateral-ingress
Thanks again