Leeds has a housing stock that produces a particular set of damp complaints. Back-to-back terraces with only one external elevation, a great many cellars, and solid walls in gritstone or soft brick mean limited cross ventilation and walls that hold water. The result is that condensation and penetrating damp are diagnosed less often than they should be, and rising damp more often, which is worth knowing before the first surveyor arrives.
Back-to-backs and the ventilation problem
A house with windows on one side only cannot be cross ventilated, and moisture generated by cooking, washing and breathing has fewer routes out. Cold external corners then reach dew point and mould appears. This reads as damp and is not cured by a damp course, which is why the pattern of staining, its position relative to cold bridges and the humidity in the room all belong in the survey.
Cellars under almost everything
Cellars are near universal in the older terraces and many of them are damp by design, built for coal and ventilated rather than sealed. Making one dry is a system decision between tanking and a drained cavity, and sealing a cellar that was ventilating the floor above can move the moisture upward rather than removing it.
Stone walls and the wrong repairs
Gritstone and soft brick were pointed in lime and repointed at some point in cement, which is harder than the stone and pushes moisture and salts into the face of it. Where that has happened the damp at the base of a wall is a pointing problem. Repointing in an appropriate lime mortar is slower and more expensive per metre than injecting a course and is often the actual answer.
Questions people ask about damp proofing Leeds
Is condensation really that common?
It is the most common damp complaint in British housing and it is over-represented in stock with poor cross ventilation. That does not mean every case is condensation; it means a survey that has not considered it has not finished.
Do landlords have different obligations here?
Landlords across England have duties on damp and mould under the housing health and safety framework, and social landlords now work to statutory timescales for investigating and fixing it. If you are a tenant, that is the route rather than a private survey.
Will insulation make damp worse?
It can, if it is added without addressing ventilation or if it creates a cold bridge at a junction. Done properly it makes surfaces warmer and reduces condensation. The difference is in the detailing, which is why the two trades should be talking to each other.