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Rising damp is a common problem in older properties either because no damp proof course (DPC) was provided at the time of building, or because a physical membrane has failed or been 'bridged'. In the majority of cases the provision of a remedial damp proof course is a cost effective and minimal disturbance option.
Dampness in buildings if left untreated can lead to structural deterioration; it will result in decay of timber, spoil decorations and can have problematic health effects through the development of moulds and mites.
When an absorbent material such as paper, wood, cloth or brick is placed in a damp atmosphere it will absorb moisture. If the humidity changes the moisture content of the material will change with it.
If a wall is wet, it will be losing moisture to the air through evaporation all the time. However, constant water rising through the masonry will cause damp patches, salt marks along with associated mould and fungal growth. Typically this is caused by the absence, failure or bridging of the damp proof course.
The source of rising damp is the soil or subsoil’s which are always wet. Soils consist of biodegraded plant matter hence water in soils is not pure and usually contains nitrate, chloride and sulphate salts. These rise through the masonry and are left behind as water evaporates. Rising damp over a number of years can cause high levels of salts in masonry. These residual salts are hygroscopic; hence they contribute to the problems found.
Wykamol provide equipment to test for damp and salts in masonry such as the protimeter as well as providing laboratory analysis.
Rising damp results from the capillary action of water from the ground. In the absence of an adequate damp proof course an area rising to around 50cm (or more) above the skirting level along the whole length of the wall will result in damp patches and discolouration. Where the damp proof course is damaged or breached, patches of dampness may occur.
Initially the damp proof course needs to be renewed. Wykamol provide an industry leading range of BBA Approved remedial Damp Proofing products. Once treated it is necessary to remove and replace the plaster to ensure the hygroscopic salts are removed. Wykamol’s renovating plaster, along with their damp proofing, waterproofing additives provide the ideal solution for long term and effective damp proofing treatment.
The range of Damp Proofing Products offered by the Wykamol Group is unique within the field of property restoration. Our products are as diverse as the famous Lectros (electro-osmotic) system, which works by reversing the background charge differential in damp walls, to chemical DPCs such as Injection Mortar (Cementitious grout) and Microtech PI (microemulsion pressure injection).
At the cutting edge of Damp proofing product development in this field comes Ultracure - a diffusion cream system for all types of walls. All our chemical DPC systems are suitable for use in accordance with BS 6576 and are manufactured under our ISO 9001 (2008) QA scheme. Injection Mortar and all our pressure injection DPC systems are approved by the BBA.
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