Rising Damp

Rising Damp is a result a capilliary action i.e., the flow of water from the ground against gravity. This is usually due to a lack of a physical damp-proof course [dpc]. Where this occurs a damp zome usually extends to the whole length of the wall to a height of 500mm or more above skirting-board level. Where the dpc does exist and if this dpc is broken or bridged [e.g. external ground level] then patches of damp may occur.

The answer is to inject a water repellent cream via a series of holes in the mortar joints using an applicator gun. Once the cream is installed the water within the damp wall will defuse the cream where it is most needed before curing to form a water repellent resin.

Any existing plaster to the effected areas will almost certainly be contaminated with hygroscopic salts. This would need to be hacked off to approximately 300mm above the damp stains but usually not less than one meter. These walls can then be replastered using specialist plasters.

Damp

In buildings, this can arise from several different sources:-

Vertical penetration
from faulty roofing, defective flashings and rain-disposal systems.

Lateral penetration
through wall structures which have become porous.

Condensation
due to high humidity inside the buildings, with condensation occurring on the coldest available surfaces. See Condensation page >>>

For your survey and report please contact our office on 01274 630111, to arrange a time to discuss your needs with one of our surveyors.