G1.1 This Part sets out the required standards for Regulations 16 to 18.
G1.2 The standards in G2 apply to all buildings, except -
G2.3 and G2.4 do not apply to a limited-life building of purpose groups 2 to 7 inclusive.
G1.3 The standards in G3 apply to a building of any purpose group, except -
to a building where the penetration of moisture from outside would be no more harmful than that likely to arise from the use of the building.
G1.4 The standards in G4 apply to a building of purpose group 1.
G1.5 In this Part -
FLOOR means any construction between the surface of the ground, or the surface of any hardcore laid upon the ground, and the upper surface of the floor, together with any floor finishes which are laid as part of the permanent construction;
WALL means any wall, including piers, chimneys, columns and parapets which form part of the wall.
ROOF means any roof, including eaves and junctions with other elements penetrating, or connected to, the roof; and
PREPARATION OF A SITE
G2.1* A site, and ground immediately adjoining a site, must have harmful or dangerous substances removed or made safe.
G2.2* A site, and ground immediately adjoining a site, which is liable to accumulate ground or flood water must be drained, or treated, to overcome the effects of any such water.
G2.3* A site, and ground immediately adjoining a site, must be cleared of any surface soil and vegetable matter (including wood) to the extent necessary to prevent any harmful effect on a building and the solum (the prepared area within the containing walls of a building) treated to prevent vegetable growth.
G2.4 Where a building is erected over an existing drain, including a field drain, which is to remain active, the drain must be re-routed if reasonably practicable or re-constructed in a manner appropriate to the conditions of the site.
RESISTANCE TO MOISTURE FROM THE GROUND
G2.5* The solum (the prepared area within the containing walls of a building) must be treated to reduce the evaporation of moisture from the ground to the inner surface of any part of a building which it could damage.
G2.6* A floor, wall or other building element adjoining the ground must prevent moisture from the ground reaching the inner surface of any part of a building which it could damage.
RESISTANCE TO PRECIPITATION
G3.1* A floor, wall, roof or other building element exposed to precipitation must prevent penetration of moisture to the inner surface of any part of a building which it could damage.
INTERSTITIAL CONDENSATION
G4.1* A floor, wall, roof or other building element of a dwelling must minimise the risk of interstitial condensation in any part of a dwelling which it could damage.
SURFACE CONDENSATION
G4.2* A floor, wall, roof or other building element of a dwelling must minimise the risk of condensation on any inner surface where it could damage the health of people.