Damp Proofing

Damp-Proofing, Chemical Damp-Proof Course, DPC, DPC Injection, Rising  Damp, Rising Damp Treatment

Damp proofing covers a wide range of issues within a property that all require a tailored solution to rectify them. SRS offer an inspection where we will inspect the property to identify the type of issue and then discuss remedial works and options. See below for a brief description of common issues and treatments alongside additional services: 


Rising Damp


Rising damp can have several causes including absence of a damp proof course from construction, failure of an existing damp proof course, previous works having negated the damp proof course or factors surrounding the property causing issues. Commonly rising damp will show as a stain on the wall including surface salts, blistering / peeling of the decoration in affected areas and decay within skirting boards. Externally indicators can be from breaking down of bricks and mortar alongside discolouration. 


An inspection would be undertaken to assess the issues and scale of the works. Following this there are multiple methods of treatment that can be used of which the most suitable would be selected for each property depending on a number of factors including age, location and use. Generally works involve the installation of a new chemical damp proof course which is a low odour cream like product dispensed from low pressure hand held applicators prior to the affected areas receiving suitable re-plastering works to ensure the problem is fully eradicated. 


Penetrating Damp 


Penetrating damp is usually when an external defect of a property causes an internal defect and can affect properties of any age or design. Before any internal defects can treated it is paramount that the source of the moisture is identified and eliminated.


Common external issues include defective rainwater goods (gutters and downpipes), cracking external render and masonry that has become porous or the pointing has weathered.  Internally penetrating damp can lead to damp staining, decaying plasterwork, mould growth, decaying timber and cold walls / reduced thermal effectiveness.


Once the issue has been identified both internal and external issues shall be resolved, where required using additional trades, roofing contractors etc.. Where applicable additional works may be advised to increase items such as ventilation, heating and insulation. 


Flue Salts 


Common in period properties, especially when the fireplaces are unused or have been covered over. Visual signs can be damp staining to the chimney breast, surface salts and damage to the decoration. Historic brickwork is often high in salts and when a moisture source is introduced through condensation or a wider issue, staining can occur. Remedial works include ensuring the moisture source is prevented, supplying sufficient ventilation and removal and replacement of contaminated plasterwork. 


External Water Repellents


Over time masonry can become porous, which over time can lead to issues from moisture penetration alongside reducing the thermal effectiveness of a wall. SRS have a number of specialist coatings generally roller or brush applied that not only let the building fabric to breathe but also dramatically increase the water repellent performance of masonry, following application and a drying / curing period a life expectancy of 20 - 30 years can be achieved depending on the property.    


Increasing Thermal Insulation


As energy prices continue to rise it is becoming ever important to increase the thermal effectiveness of a property. The increasing use of insulation of walls and floors is becoming common. Usually aligned with a wider works package SRS are happy to discuss increasing a properties thermal effectiveness during an inspection and provide detailed information within quotations and where internal insulation is not an option can advise on options for external insulation and render to be installed by suitable contractors.