Damp Survey and Damp Proofing in Werrington

Werrington township was laid out and built mainly in the 1970s and 1980s under Peterborough's expansion, and the housing reflects the construction methods of that period: cavity masonry, timber-frame construction in places, shallow-pitched and occasionally flat roofs, and integral or linked garages. Cavity walls of this age perform well against driven rain until the cavity is bridged. Mortar dropped during construction, debris collecting at the base of the cavity, retrofitted insulation that has slumped or been installed where it was unsuitable, and wall-tie or lintel details that channel water inwards are the usual routes, and the resulting internal damp patch is regularly misread as rising damp.

Retrofitted cavity-wall insulation is worth singling out in this part of Peterborough because so much of it was installed under national programmes in housing of exactly this age and type. Where a wall is exposed to driven rain, where pointing or render is defective, or where the fill has settled leaving a void at the top and a bridge at the bottom, moisture can cross the cavity and produce persistent damp patches that resist redecoration. Establishing whether insulation is present, what condition it is in and how the elevation is performing is part of a proper investigation rather than an optional extra.

The older core around Werrington village, together with Paston and Walton, includes solid-walled brick and stone properties and former farm buildings that predate damp-proof courses and behave quite differently from the estate housing around them. In those buildings we look first at external ground levels, rainwater disposal, hard cement pointing and render, and internal finishes that prevent the wall drying. The same inspection in a 1980s house on the estate would concentrate on the cavity, the insulation and the extract provision instead, which is why one approach cannot be applied to a whole postcode.

Condensation and mould are the most frequent complaints in the township housing, and the contributing factors are usually a combination of cold bridges at reveals, lintels and floor junctions, extract fans that no longer move enough air, and everyday moisture from cooking, bathing and drying washing indoors. Where timber frame is involved, the priority is establishing whether any moisture has reached the frame itself rather than being confined to the outer leaf. Our inspections record moisture content, humidity and surface temperatures, and set out what is fabric and what is moisture balance.