Educational

Room corner with window condensation and mould speckles, accompanied by icons for reducing moisture, ventilation, warmth and repairing cold spots or air leaks.

Condensation and black mould on walls: causes a...

Black mould on walls is almost always condensation - warm, moist indoor air meeting cold surfaces. This UK guide explains the four levers that stop it (moisture, ventilation, warmth and...

Condensation and black mould on walls: causes a...

Black mould on walls is almost always condensation - warm, moist indoor air meeting cold surfaces. This UK guide explains the four levers that stop it (moisture, ventilation, warmth and...

Ground-floor wall section shows moisture rising through a local defect in a blue damp-proof course, with a tide mark and lower exterior ground level.

How to treat rising damp in walls and floors (U...

Rising damp is ground moisture drawn up through walls and floors where the damp-proof course has failed or is missing. This UK guide explains how to confirm it, create a...

How to treat rising damp in walls and floors (U...

Rising damp is ground moisture drawn up through walls and floors where the damp-proof course has failed or is missing. This UK guide explains how to confirm it, create a...

Rain enters a damaged rendered wall beside a sound wall with its water-repellent protective surface highlighted in blue.

How to stop penetrating damp through an externa...

Penetrating damp is rainwater getting in from outside - through cracked render, failed pointing, leaking gutters or a soaked solid wall. This UK guide shows how to find the cause,...

How to stop penetrating damp through an externa...

Penetrating damp is rainwater getting in from outside - through cracked render, failed pointing, leaking gutters or a soaked solid wall. This UK guide shows how to find the cause,...

Cutaway house shows a low damp tide mark, rain entering beside a downpipe and condensation with mould at a cold upper corner.

Rising damp, penetrating damp or condensation? ...

Damp on a wall has three main causes - rising damp, penetrating damp and condensation - and each needs a completely different fix. This UK guide shows you how to...

Rising damp, penetrating damp or condensation? ...

Damp on a wall has three main causes - rising damp, penetrating damp and condensation - and each needs a completely different fix. This UK guide shows you how to...

Exploded wall diagram shows plasterboard, service void, purple VCL, insulated timber frame, sheathing, breather membrane, cavity and brickwork.

Where does the vapour control layer go in the w...

A layer-by-layer reference showing exactly where the vapour control layer sits in a timber frame wall, internal wall insulation, a warm roof, a cold roof and a ground floor -...

Where does the vapour control layer go in the w...

A layer-by-layer reference showing exactly where the vapour control layer sits in a timber frame wall, internal wall insulation, a warm roof, a cold roof and a ground floor -...

Side-by-side diagrams compare a warm-side vapour control layer restricting vapour with an outer breather membrane allowing vapour to escape.

VCL vs breather membrane: what's the difference...

A vapour control layer and a breather membrane look similar but do opposite jobs. This UK guide explains the difference, where each one goes, how vapour resistance (sd-value) works, and...

VCL vs breather membrane: what's the difference...

A vapour control layer and a breather membrane look similar but do opposite jobs. This UK guide explains the difference, where each one goes, how vapour resistance (sd-value) works, and...