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Site preparation and resistance to contaminants
26NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The site of a building and the ground adjacent to it shall be prepared and treated, and measures shall be taken, so as to prevent, as far as reasonably practicable, any harmful effect on the building
dwellingnon-domesticsite-planningSubsoil drainage
27NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The site of a building and the ground adjacent to it shall be drained as far as reasonably practicable, or the building otherwise protected so as to prevent any harmful effect on the building or the h
dwellingnon-domesticdrainagesite-planningResistance to moisture and weather
28NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Every wall, floor and roof shall be constructed so as to prevent any harmful effect on the building or the health of the occupants caused by the passage of moisture to any part of the building from— (
dwellingnon-domesticCondensation
29NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
A building to which this regulation applies shall be designed and constructed so as to prevent, as far as reasonably practicable, any harmful effect on the building from moisture in the form of inters
dwellingnon-domesticIntroduction to site contamination
3.1-3.2NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
A wide range of solid, liquid and gaseous man-made contaminants can arise on sites, especially those that have had a previous industrial or commercial use. Other sites, with a generally rural use such
site-planningnon-domesticdwellingGeneral guidance on moisture resistance in floors
5.1, 5.2NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
This section gives guidance on the resistance to the passage of moisture from the ground in relation to the following floor types – (a) ground supported floors (see paragraphs 5.3 to 5.11); (b) suspen
drainagedwellingnon-domesticGround supported floor construction with concrete
5.3, 5.4NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Any ground supported floor should meet the requirement to resist the passage of moisture from the ground if the ground is covered with dense concrete laid on a hardcore bed and a damp proof membrane i
drainagestructuraldwellingnon-domesticVentilated air space requirements for suspended timber floors
5.13(c)NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
with a ventilated air space measuring at least 75 mm from the ground cover to the underside of any wall plates and at least 150 mm to the underside of the suspended timber floor (or insulation if prov
dwellingnon-domesticventilationaccessprotection-from-fallingDamp proof course for suspended timber floors
5.13(d)NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
with a damp proof course of impervious sheet material, engineering brick or slates in cement mortar or other material which will prevent the passage of moisture. Guidance on choice of materials is giv
dwellingnon-domesticdrainageCavity trays on raft foundations and ground beams
6.8NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Where a cavity wall is constructed directly off a raft foundation, ground beam or similar supporting structure a cavity tray should be provided with weep holes every 900 mm to assist in the transfer o
moisturedrainagedwellingnon-domesticExternal solid walls
6.9NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
An external solid wall should meet the requirement if it will hold precipitation until it can be released in a dry period without penetrating to the inside of the building, or causing damage to the bu
moistureexternal-spacedwellingnon-domesticInsulated external walls - examples
Diagram 6.4NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Solid walls: external protective system with 50 mm minimum residual cavity, breather membrane, sheathing board, vented and drained cavity. Cavity walls: (a) External insulation, (b) Internal insulatio
dwellingnon-domesticinsulationexternal-wallsmoisturecondensationDamp proof courses at obstructions and openings
6.32NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Damp proof courses should be provided to direct moisture towards the outside – (a) where the downward flow of moisture would be interrupted at an obstruction, e.g. at a lintel (see Diagram 6.3(b)); (b
dwellingnon-domesticprotection-from-fallingglazingmoistureDoor thresholds in external walls - weather protection guidance
6.33NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Guidance on weather protection of accessible thresholds is given in – (a) BRE Good Building Guide 47 Level external thresholds: reducing moisture penetration and thermal bridging; and (b) The Statione
dwellingnon-domesticaccessaccessibilitymoisture