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Interstitial condensation risk with DPM on cold side of insulation
5.19NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
When the DPM is placed on the cold side of the insulation there is a risk of interstitial condensation which may accumulate year-on-year and a VCL will be required. However, with insulation of high va
energydrainageInsulation placement in external solid walls
6.11NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
An external solid wall should be insulated on the inside or on the outside. Where the insulation is on the inside, a cavity should be provided to give a break in the path for moisture and, where the i
energydrainageFull or partial cavity insulation of external walls
6.16NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
A full or partial fill insulating material may be placed in the cavity between the outer leaf and an inner leaf of masonry subject to the following conditions – (a) the suitability of a wall for insta
energyprotection-from-fallingBRE Report BR 262 exposure guidance for cavity walls
6.17NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
BRE Report BR 262 Thermal insulation: avoiding risks provides guidance on exposure of cavity walls to driving rain. It contains a map showing exposure zones and a table giving maximum recommended expo
energyFramed external walls with vented and drained cavity
6.18NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Any framed external wall will meet the requirement if the cladding is separated from the insulation or sheathing by a vented and drained cavity with a membrane that is vapour permeable, but resists th
energy