Rising damp is the term used for the slow upward movement of dampness in the lower sections of walls and other ground supported structures by "capilliary action". It is a particular problem in older buildings where the original rising damp treatment (damp proof course) has been damaged or where the ground level around a property has been raised with the addition of a new path or driveway. Over time the dampness from the ground works its way through the brickwork, stonework or through the softer mortar that holds the brickwork together.
This dampness often contains soluble salts which are deposited on the walls as they dry out. These "hygroscopic salts" draws moisture from the atmosphere giving a permanent damp feeling to the walls. Rising damp which is rarely above 1.5sqm in height can be identified by a characteristic "tidemark" on the lower sections of the affected wall. Rising damp causes skirting, floorboards, floor joist and wall plates to rot, leading to mould, efflorescence (white salts) and the deterioration of internal decorations.
Longuard Damp Proofing offer a variety of remedies in properties where rising damp is occurring. Most treatments will involve a new damp proof course and replastering to our specifications.
Where rising damp occurs defective plastering must be removed. Longuard Damp Proofing will remove all defective plastering and replaster to our specifications with specialist admixture to offer long term resistance to rising damp.