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The Workplace (Health, Safety and Welfare) Regulations (Northern Ireland) 1993
NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The Workplace (Health, Safety and Welfare) Regulations (Northern Ireland) 1993 (the Workplace Regulations) contain some requirements which affect building design. The main requirements are now covered
flatsdwellingApplication of Regulation 29 – scope limited to dwellings
25(2)NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Regulation 29 applies only to a dwelling.
dwellingDefinitions – Radon affected area
25(3)NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
"Radon affected area" means any area designated as such by the Health Protection Agency in the publication 'Radon in Dwellings in Northern Ireland: 2009 Review and Atlas';
dwellingSite 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-domesticSite preparation and resistance to contaminants - Performance
0.1, 0.2NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
It is the view of the Department that the requirements of regulation 26(1) will be met by making reasonable provisions to prevent harmful effects on the building and to secure the health and safety of
dwellingsite-planningIntroduction to radon protection provisions
0.4NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The guidance in Section 3 is to ensure that where a dwelling is located in the radon risk category of 1-3% or any category above this risk on the radon map in 'Radon in Dwellings in Northern Ireland:
dwellingsite-planningInterstitial condensation control in dwellings
0.9NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
It is the view of the Department that the requirements of regulation 29 will be met if the floors, walls and roofs of a dwelling are designed and constructed to protect the dwelling from harmful effec
dwellingventilationDesign and construction guidance to avoid interstitial condensation
0.10NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The guidance in Section 8 is to ensure that interstitial condensation in a dwelling is avoided by following the design and construction guidance given in the specified BS and BRE technical documents.
dwellingventilationIntroduction 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-domesticdwellingDistrict council powers for contamination - radon and discovery during construction
3.4NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The only active use of the district council's power to deal with contaminants is in relation to the risk of radon ingress in dwellings where dwellings in a designated radon affected area are required
dwellingsite-planningRadon - naturally occurring radioactive gas
3.6NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Radon is a naturally occurring radioactive colourless and odourless gas which is formed in small quantities by radioactive decay wherever uranium and radium are found. It can move through the subsoil
dwellingnaturally-occurring-contaminantRadon affected areas definition
3.7, 3.8NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Maps showing the probability of radon concentrations in dwellings in Northern Ireland are available in the Health Protection Agency report Radon in Dwellings in Northern Ireland: 2009 Review and Atlas
dwellingradonRadon protection requirements for dwellings
3.10NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
In radon affected areas – (a) new dwellings; (b) alterations, extensions, conservatory and porch extensions (including exempt conservatory and porch extensions) to dwellings; and (c) buildings convert
dwellingradonRadon protection guidance references
3.11NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Guidance on protective measures is given in the following publications produced by BRE – (a) BR 413 Radon: guidance on protective measures for new dwellings in Northern Ireland. Note: the following ma
dwellingradonRadon Protection Requirements by Risk Zone
3.12NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The level of protection required in Northern Ireland is given in Table 3.1. Radon risk shown on the radon map referred to in para 3.7 (probability of radon in a dwelling exceeding the Action Level) |
dwellingradonsite-preparationGeneral 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-domesticaccessaccessibilitymoistureInterstitial condensation - scope
8.1, 8.2NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Regulation 29 (Condensation) applies only to dwellings. A dwelling should meet the requirement to avoid any harmful effects caused by interstitial condensation if it is designed and constructed in acc
dwellingcondensationmoisture