Damp Proof Course Injection for Rising Damp
A failed, bridged or missing damp proof course can allow moisture from the ground to affect the lower sections of masonry walls. When rising damp is correctly diagnosed, a remedial damp proof course injection can create a new water-repellent barrier within suitable masonry and help control further moisture movement.
ThinkDRY provides professional damp surveys and damp proof injection treatment for homes and commercial properties. Our approach starts with identifying why the wall is damp before recommending treatment. Where DPC injection is appropriate, our specialists prepare the affected masonry, install the remedial damp proof course and advise on any salt-contaminated plaster and reinstatement required afterwards.
For a professional Damp Proofing Specialist call us on 07972 822827
How Does Damp Proof Injection Work?
Damp proof injection is a remedial treatment commonly used where an existing damp proof course has failed, become ineffective or is absent.
Small holes are drilled at appropriate intervals along a suitable mortar course. A specialist damp proof injection cream is then introduced into the masonry. The active material disperses within the mortar and surrounding pores, creating a hydrophobic barrier designed to resist the upward movement of moisture.
The exact installation method depends on the wall construction, thickness, condition and the product being used. That is why the wall should be assessed before treatment rather than assuming every low-level damp patch requires an injected DPC.
What Is Rising Damp and How Does DPC Injection Treat It?
Rising damp describes moisture moving upwards through porous masonry from the ground by capillary action. A functioning damp proof course is intended to interrupt this movement.
Possible symptoms include:
- Dampness concentrated toward the bottom of ground-floor walls
- Deteriorating or crumbling plaster
- Peeling paint or wallpaper
- Salt deposits on walls or plaster
- Damaged skirting boards
- Persistent low-level moisture readings
These symptoms do not prove rising damp by themselves. Leaking pipes, external ground levels, penetrating damp, condensation and other moisture sources can produce similar signs.
ThinkDRY therefore starts with diagnosis. If rising damp is identified and an injected DPC is suitable for the construction, a remedial damp proof course can form part of the treatment.
How Is Damp Proof Injection Cream Installed?
Correct preparation is as important as the injection itself.
The treatment normally begins by inspecting the wall construction and identifying the appropriate mortar course. Where necessary, fixtures such as skirting boards may need to be removed and damaged or salt-contaminated plaster dealt with separately.
Holes are then drilled into the selected mortar course according to the requirements of the DPC system. Damp proof cream is injected into these holes, where it disperses through the masonry to establish the remedial moisture barrier.
After installation, the wall still contains residual moisture. It needs time to dry, and any contaminated internal finishes must be treated appropriately before final decoration.
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When Is a Chemical DPC the Right Treatment?
DPC injection is specifically associated with controlling rising damp. It is not a universal cure for every damp wall.
Before recommending treatment, the source of moisture should be established. An injected damp proof course may be appropriate where investigation identifies rising moisture associated with an ineffective, compromised or absent DPC and the wall construction is suitable for injection.
It will not correct unrelated defects such as:
- Penetrating damp caused by defective pointing, masonry, gutters or external water ingress.
- Condensation caused by excessive internal humidity, inadequate ventilation or cold surfaces.
- Plumbing leaks from damaged water or waste pipes.
- Below-ground water ingress, which may require a dedicated waterproofing system rather than a standard injected DPC.
Correct diagnosis prevents unnecessary treatment and allows the underlying moisture source to be addressed.
What Happens to Damp and Salt-Contaminated Plaster?
Installing a new DPC controls the source of rising moisture, but it does not instantly restore plaster that has already been damaged.
Moisture travelling through masonry can carry soluble salts into the wall finish. Existing plaster may therefore remain hygroscopic, deteriorated or visibly stained even after the source of moisture has been controlled.
Where necessary, affected plaster is removed and replaced using a suitable specification as part of the remedial work. The wall must then be allowed to dry progressively.
This distinction is important: DPC injection controls further rising moisture; appropriate plaster treatment and drying deal with the damage already present.
How Long Does a Wall Take to Dry After DPC Injection?
Drying is gradual rather than immediate.
The time required depends on factors including wall thickness, construction, initial moisture level, ventilation, temperature and the extent of the original damp problem.
Thick or heavily saturated masonry can take considerably longer than a lightly affected internal wall.
Decoration should therefore not be rushed. ThinkDRY can advise on drying and redecoration following treatment so that new finishes are not applied before the substrate is ready.
How Much Does Damp Proof Course Injection Cost?
There is no reliable single price for every DPC injection project because the scope of treatment varies between properties.
Cost can be affected by:
- Length and thickness of the walls requiring treatment
- Wall construction and accessibility
- Extent of existing moisture damage
- Removal of skirting boards or fixtures
- Amount of contaminated plaster requiring removal
- Replastering and reinstatement requirements
- Other defects identified during the survey
A survey allows the cause and extent of the problem to be established before a quotation is prepared.
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Understanding Damp Course Injection and Treating Rising Damp
Damp course injection is a common method used to treat rising damp, a type of moisture problem that occurs when groundwater travels up through porous building materials, causing dampness in walls and floors.
In damp course injection, a chemical damp proof course is injected into the affected masonry above the ground level outside to create a barrier against moisture penetration. Injected into the boreholes, the damp course injection process offers defenses against rising damp, thereby proofing buildings where the original defenses may have failed.
Additionally, treating rising damp may involve repairing or replacing damaged plaster, improving ventilation to reduce humidity levels, and addressing any underlying structural issues contributing to moisture ingress. Professional assessment and remediation are crucial for effectively treating rising damp and preserving the integrity of the building structure.
Understanding Inject Damp, Damp Proof Course, and Damp Survey
Inject damp refers to a method of damp proofing whereby a specialised chemical solution is injected into affected areas of a building's structure to create a barrier against moisture ingress.
This technique is commonly used to treat rising damp and prevent further damage to walls and floors caused by moisture penetration. On the other hand, a damp proof course (DPC) is a physical barrier installed within the walls of a building to prevent moisture from rising through capillary action.
If the diagnosis of rising damp is confirmed, it can be made of materials such as plastic, slate, or bitumen and is crucial for maintaining the integrity of the building's structure. A damp survey involves a comprehensive inspection of a property to assess the extent of dampness and identify potential causes and areas of concern.
Conducted by trained professionals, a damp survey helps to diagnose damp-related issues such as rising damp occurs, accurately and recommend appropriate remedial actions to mitigate moisture problems effectively.
Why Choose ThinkDRY for Damp Proof Injection?
Damp treatment should begin with determining the source of moisture, not simply injecting a wall because it appears damp.
ThinkDRY provides professional assessment and remedial damp treatment, with recommendations based on the property, wall construction and cause of the problem.
For suitable rising damp cases, our service can cover the process from initial survey and preparation through DPC installation and associated plaster treatment.
Free damp survey
Assess the symptoms before deciding on treatment.
20-year guarantee
ThinkDRY currently offers a 20-year guarantee on qualifying damp-proofing work.
Over 10 years' experience
Experienced in diagnosing and treating damp-related property problems.
Fully insured
Professional treatment for residential and commercial properties.
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Damp Proof Injection FAQs
Have questions about damp proof injection? Find answers about how damp proof injection cream works, when it is used to treat rising damp, how it is injected into walls, treatment times, replastering and what to expect after installation.
Book a Free Damp Survey
If you have damp patches, deteriorating plaster, salt deposits or other signs that could indicate rising damp, arrange an inspection before deciding on treatment.
ThinkDRY can assess the affected area, investigate the likely moisture source and explain whether damp proof course injection or another form of damp treatment is appropriate.
