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Rising Damp

Rising Damp

Rising damp is the most common form of dampness encountered in buildings; this is left to condensation. However, it is very likely that a high proportion of older buildings are affected by rising damp to some degree or another, and it does cause problems with positive identification, appropriate remedial action and ancillary works.

Rising damp in buildings may be defined as the vertical flow of water up through a permeable wall structure, the water being derived from ground water. The water rises through the pores (capillaries) in the masonry by a process loosely termed 'capillarity'. In other words, the masonry acts like a wick.

Figure 1: Water rising through the mortar beds

Rising Damp Diagram

Ground water

Ground water contains small amounts of soluble salts, the most significant of which are chlorides, nitrates and sulphates. These pass with the water up the wall and are left behind when the water evaporates. Over many years of active rising damp large quantities of these salts accumulate within the masonry and decorative surface, most becoming concentrated in a general `salt bond` towards the maximum height of rise. Frequently, the concentrations of these salts are very low towards the base of the wall.

Both chlorides and nitrates are usually hydroscopic, i.e. They can absorb moisture from the surrounding environment and in general, the greater the amount of salts the greater the absorption of moisture, especially under humid conditions. Thus, even though rising dampness may have been controlled by the insertion of a remedial damp proof course these salts alone can cause the wall and any contaminated decorations to remain damp.

Triton Approved Contractors

As Triton approved contractors, during the installation of a damp proof course Damptec will only use Triton approved products. By using only approved products, as a customer you can be rest assured that only the best quality products are used. Triton holds British Board of Agreement approvals and is a BS EN ISO 0001 Quality Assured Company. The product used to install a chemical injection damp proof course is called Tri-cream.

Triton TRI-CREAM is a unique blend of silane & siloxanes for injection into brickwork etc., for the control of rising dampness. Triton TRI-CREAM can be used in all types of masonry without the use of high-pressure equipment. The cream is delivered by hand pressure only from a simple displacement pump and injector lance into a series of holes drilled into the mortar course.

From here it migrates rapidly into the masonry pores where the injection cream reverts to a liquid phase and polysiloxanes are formed in situ. During the curing, period a low molecular-weight silane vapour is also produced giving excellent migration through the wall. Curing of the DPC starts immediately with the final cure taking 2-6 weeks depending on wall thickness.

Extensive field experience with this technology demonstrates that Triton TRI-CREAM will perform as well as any conventional liquid injection system against rising damp.

All our damp proofing works are in accordance with the 'Code of practice for installation of chemical damp proof courses' BS6576 (1985).

Rising Dampness

As previously mentioned, even though rising dampness may have been controlled by the insertion of a remedial damp proof course these salts alone can cause the wall and any contaminated decorations to remain damp. It is there fore necessary to remove the internal plaster works up to a height of 1 meter or 500mm beyond the last sign of dampness.

After The Removal

After the removal of the existing plaster works, a salt neutraliser will be applied. The purpose will be to neutralise the action of salts to prevent or reduce efflorescence.

Re-Plastering

Re-plastering using a salt retardant render additive such as Triton TRIMIX 1 is essential if hygroscopic salts and residual moisture are to be successfully held back. Triton TRIMIX 1 is specially formulated for addition to cement mortars intended for re-plastering walls affected by rising dampness.

The substrate to be rendered should be prepared in accordance with the good practice. Surfaces should be clean, sound and free from contaminating residues of gypsum plasters, bitumen coatings, etc. apply two coats of render, the first being a 3:1 washed sharp sand: Portland cement mix with Triton TRIMIX 1 incorporated in the gauging liquid.

Apply a minimum thickness of 10mm. Second coat being a 4:1 washed sharp sand: Portland cement mix but without the Triton TRIMIX 1 A mortar plasticizer may be used if required. Apply to a thickness of 10mm. The finish coat should be a porous skim plaster applied when the cement render coats are fully cured.

Payment Plans

Payment plans are now available on all damp proofing work. If you would like more information on this, please contact us using the provided details in our website.

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Areas We Cover

We are based in Ramsgate, Kent and provide our services across the following areas and beyond:

  • Ashford
  • Broadstairs
  • Birchington
  • Canterbury
  • Faversham
  • Herne Bay
  • Margate
  • Medway Towns
  • Ramsgate
  • Whistable

For further details on the range of services we provide please contact us or call us on 01843 596176.

Contact Details

01843 596176
01227 209895
07732 973468

damptecplastering@gmail.com

Damptec Plastering Ltd.
Marlowe Innovation Centre
Marlowe Way
Ramsgate
Kent
CT12 6FA

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