A damp-proof course installation is a new horizontal barrier in the wall, usually by chemical injection, after a survey shows the original course has failed. It is for confirmed rising damp in England, Scotland, and Wales, not for condensation or a bridged course. Send the quote form or WhatsApp with the postcode.
Damp Proof Course Installation
The original physical course cannot be relied on, and the damp is groundwater rising through the masonry. The survey has already ruled out a bridge and a leak.
A water-repellent cream is placed in the mortar bed so it spreads and forms a new course. The holes are at the course line, not scattered up the wall.
Salts already in the plaster will mark a new coat of ordinary gypsum. The installation is unfinished if that plaster stays.
If the course is sound and the soil is above it, the ground is lowered. If the stain is rain or a pipe, injection is declined.
Damp Proof Course Installation
The new course follows the mortar joint at damp-proof course level so it lines up around the room.
The cream has to cross the thickness of the wall. A smear in the outer holes is not a course.
The replaster stops the salts reaching the new decoration. It is specified to the height the contamination reaches.
The new course must sit above the finished outside level. Injection below a raised patio still bridges.
The new course has to return into a breast or a nib. A gap there leaves a path for the damp.
Soft skirtings come off with the salty plaster. New ones are fitted after the replaster, not buried in it.
We only inject after rising damp is distinguished from bridging, rain, and condensation.
We only inject after rising damp is distinguished from bridging, rain, and condensation.
Salt-contaminated plaster is marked and removed so the new course is not hidden behind it.
Cream goes into the mortar bed at the course line, across the wall thickness.
Ordinary gypsum is not used on the contaminated area.
A solid brick wall about 230mm thick commonly takes months to dry after the moisture is stopped.
The treatment named in the written quote carries a 30-year guarantee.
Injection is priced by the metres of wall. Replastering is priced by how much salty plaster comes off, and it is often the larger part of the bill. Compare quotes only when both lines are present. A per-metre rate that excludes plaster is not a finished job.
Questions that decide whether this is the right job.
They are a recognised way to form a new barrier in masonry when rising damp is real and the product is installed through the wall. They do not work as a cure-all for other damp.
If it is sound and simply bridged, we do not inject. The bridge is removed so the existing course can work.
Only if you accept that salts will keep marking the old plaster. A finished internal wall needs the contaminated plaster off.
The treatment named in the written quote carries a 30-year guarantee. The guarantee is not a promise that the wall looks dry the day we leave.
Tell us the floor, whether it follows rain, and the postcode. The quote follows the survey.
Get Your Free QuoteGroundwater travels up through brickwork when the damp-proof course is missing or has failed.
Learn more about Rising Damp TreatmentSalt-contaminated plaster comes off the treated wall, then the wall is replastered and finished.
Learn more about Salt Neutralisation & ReplasteringA damp survey with moisture meters and thermal imaging, so the cause is known before any work.
Learn more about Damp Survey & Moisture ReportSurveys run in Kent, Cardiff, and Glasgow, and in the other counties and towns on the areas page.
Name the room, the floor, and what the wall is doing. WhatsApp takes the same details.