ASK THE EXPERT
Qcould you advise on how to deal with damp patches? They aren’t at floor level and I think might be caused due to issues with the external walls.
In order to treat a dampness problem in a building effectively, it is important to accurately identify the cause and then, ideally, to treat it. Different forms of dampness will require different solutions to treat.
Start by looking for an obvious cause of dampness. You mention that you suspect problems with the external walls so I suggest you start by looking outside for signs of rainwater penetration. It could be caused by overflowing rainwater goods, so be sure to take a look when it’s raining.
Not infrequently, the cause may be less obvious and in many cases additional factors may be compounding a moisture issue, not least the use of inappropriate materials on older buildings; for example, non-breathable cement mortar, and standard modern plaster and paint.
You may also need to seek professional advice. This should be obtained separately from quotations for work to address the dampness, to avoid vested commercial interests giving rise to recommendations to carry out more measures than are necessary. Free surveys are also best avoided. The SPAB can suggest the names of chartered building surveyors and other appropriately qualified dampness specialists over its free helpline (run Monday to Friday 9.30am to 12.30pm on 020 7456 0916).
QShould I discard old timber sash windows that are in poor working order?
Old windows can contribute immeasurably to the special interest of a building but are often destroyed unnecessarily when simple overhauling or repair is possible instead. Work frequently involves replacing broken sash cords that prevent the window from opening or shutting properly. It may also entail refixing or renewing staff beads and parting beads (baton rods) used to position the sashes within their frame. Other work required might be the repair of worn or grooved stiles that permit too much lateral movement, and the easing and adjusting of pulleys to ensure good operation. Be sure to seek out a good firm that specialises in such work.
If you have a renovation question for Douglas, email periodliving@futurenet.com*