EssexChelmsford

Damp Proof Course Injection in Chelmsford

Creating a new permanent chemical DPC barrier in walls where the original has failed or was never installed.

Free Inspection No-Obligation Quote Long-Term Guarantee All of Essex Covered

Damp Proof Course Injection in Chelmsford

Damp proof course injection is the standard professional treatment for rising damp caused by a failed or absent damp proof course. The process involves drilling a series of holes into the mortar course at low level and injecting a silicone-based cream under low pressure. The cream migrates through the masonry pores and chemically bonds with the material, forming a water-repellent barrier that stops groundwater rising further into the wall. Once the cream has cured — typically within 24–48 hours — it provides a permanent chemical damp proof course that requires no ongoing maintenance.

It is important to understand that DPC injection solves the path through which moisture is rising, but it does not remove the salt-contaminated plaster that has already been damaged. After injection, the existing plaster must be removed and replaced with a specialist salt-retardant replastering system. If this step is omitted, hygroscopic salts in the old plaster will continue to draw moisture from the air and the new decoration will fail in a very short time.

Signs to Look For in Your Chelmsford Property

→Tide marks on walls below 1.2 metres indicating water has risen from the ground
→Salt crystallisation (white fluffy deposits) on wall and plaster surfaces
→Blown, soft, or crumbling plaster at low level
→Skirting boards that are damp, stained, rotting, or separating from the wall
→Moisture meter readings significantly elevated at low wall level
→Previous DPC injection treatment that has failed or was not accompanied by replastering

How We Treat Damp Proof Course Injection in Chelmsford

Drill a series of holes at 120mm centres into the mortar course just above floor level — typically at 150mm above finished floor level on both internal and external faces of the wall

Inject silicone-based damp proof cream into each hole at low pressure, allowing it to spread through the mortar course and masonry pores

Allow the cream to cure over 24–48 hours to form the new chemical damp proof barrier

Hack off all salt-contaminated plaster from the affected wall area to a height of at least 300mm above the visible damp line

Re-plaster using a two-coat sand and cement system incorporating a salt-retardant additive, providing a sound base for final decoration

Areas Covered in Essex

We provide damp proof course injection throughout Chelmsford (CM1, CM2, CM3, CM9) and the surrounding areas including Moulsham, Springfield, Broomfield, Great Baddow, Galleywood, Writtle, Danbury, South Woodham Ferrers.

Our local inspection team can usually attend within 48 hours. Call 01473 561 031 or use the form to book.

Common Questions About Damp Proof Course Injection in Chelmsford

A professional inspection using calibrated moisture meters will confirm elevated moisture at low level in the wall. Visual signs include tide marks, salt deposits, and blown plaster. If rising damp is present and there is an existing DPC, it may have been bridged by raised ground levels or failed internally.

Not normally. The injection process itself is quick and low-disruption. The replastering that follows requires the rooms to be cleared, but no hazardous chemicals are involved and you can usually remain in the property.

A properly installed silicone-cream DPC is a permanent solution. The chemical bond between the silicone and the masonry does not degrade over time, and the barrier does not require maintenance or renewal.

Standard drilling and injection is difficult in some stone and flint constructions. In these cases, we may recommend electro-osmotic systems, internal tanking, or surface drainage systems as alternative approaches.

Our Chelmsford Guarantee

All our damp proof course injection work in Chelmsford comes with a long-term written guarantee. Our guarantees are accepted by the majority of UK mortgage lenders and are transferable to new owners on sale of the property.