Colchester mixes a very old core with a lot of post-war and modern building, and the damp problems split along the same line. In the older stock the questions are about lime, timber frame and breathability; in the newer stock they are about cavities, bridges and condensation. A surveyor who applies one set of assumptions to the other kind of building will reach the wrong answer confidently, so the first useful thing to establish is which building you have.
Timber frame, lime and soft brick
Older buildings here were built to get wet and dry out again. Lime plaster, lime mortar and permeable finishes let moisture move; cement render, gypsum plaster and modern paints stop it, and the moisture then concentrates in the timber. Where a historic building is damp, removing an impermeable layer applied in the last fifty years is frequently the whole remedy, and injecting a course into a timber framed wall makes no sense at all.
Cavity walls and what bridges them
In cavity built stock the usual findings are mortar snots bridging the cavity, debris at the base, a cavity tray missing or damaged over an opening, or retro-fitted cavity insulation that has slumped or is carrying water across. These are inspectable with a borescope and none of them is a rising damp problem, though they produce staining in the same places.
Clay ground and what it does
Shrinkable clay moves seasonally, and movement opens cracks in render, pointing and around openings that then let water in. Damp that appears after a dry summer, or that follows a crack, deserves a structural opinion before a damp one. Fixing the water path without understanding the movement that opened it is a repair with a return date.
Questions people ask about damp proofing Colchester
Is a listed building treated differently?
Yes. Consent is needed for many alterations and the technically correct repairs are usually the traditional ones, in lime rather than cement. A contractor who works on historic buildings routinely will raise this before you do.
Can cavity wall insulation cause damp?
It can where it has been installed in an unsuitable wall or has slumped, and where that is the finding the remedy is extraction rather than a damp course. It should be checked directly rather than inferred, and that means a borescope inspection.
What should a survey cost me?
An independent survey is a professional fee and a contractor's survey is usually free. This site does not publish a figure for either, because what you are buying varies from a half hour look to a written report with a specification, and the two are not comparable.