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Table of Contents - Section 7 Roofs
Section 7NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Section 7 Roofs 36 General 36 Resistance to moisture from the outside 36
roofsprotection-from-moistureTable of Contents - Section 8 Condensation
Section 8NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Section 8 Condensation 38 Interstitial condensation 38
condensationventilationTable of Contents - Appendix
AppendixNI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Appendix Publications referred to 39
About This Technical Booklet Series
NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
This Technical Booklet, which takes effect on 31st October 2012, is one of a series that has been prepared by the Department of Finance and Personnel (the Department) for the purpose of providing prac
Scope of Technical Booklet C
NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The guidance contained in this Technical Booklet relates only to the requirements of regulations 26, 27, 28 and 29. The work will also have to comply with all other relevant requirements of the Buildi
Materials and Workmanship
Regulation 23NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Any building work which is subject to requirements imposed by Part A of the Building Regulations should be carried out in accordance with regulation 23 of those regulations. Guidance on meeting these
Named standards
NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Where this Technical Booklet makes reference to a named standard, the relevant version of the standard is the one listed in the Appendix. However, if this version has been replaced or updated by the i
Diagrams
NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The diagrams in this Technical Booklet supplement the text. They do not show all the details of construction and are not intended to illustrate compliance with any other requirement of the Building Re
Protected buildings
NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
District councils have a duty to take account of the desirability to preserve the character of protected buildings when carrying out their functions under Building Regulations. Therefore, where work i
conservationOther legislation overview
NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The provisions of this Technical Booklet relate to the requirements of Building Regulations and do not include measures which may be necessary to meet the requirements of other legislation. Such other
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
flatsdwellingWaste and Contaminated Land Order 1997
NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Waste and Contaminated Land (Northern Ireland) Order 1997 This Order sets out the regime for identifying and remediating contaminated land and within the context of 'proposed development' this regime
site-planningcontaminated-landFlood Risk Planning Policy
NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Planning (Northern Ireland) Order 1991 Development in areas of flood risk is regulated by the Northern Ireland Planning Service under the Planning (Northern Ireland) Order 1991. The planning policy in
flood-risksite-planningFlood Risk Material Consideration
NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Flood risk The susceptibility of land to flooding is a material consideration which is taken into account by the Northern Ireland Planning Service in determining planning applications. There is a pres
flood-risksite-planningBuilding Regulations and Flood Risk Mitigation
NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The Building Regulations do not set any requirements for resistance to flooding. However, where planning permission is granted for a building in an area considered to be at risk of flooding, or where
flood-riskdrainagemoisture-resistanceApplication of Regulation 28 – exemptions for certain building uses
25(1)NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Regulation 28 in respect of resistance to ground moisture of floors and walls, and weather resistance of walls, shall not apply where the building is intended to be used wholly for— (a) storing goods,
industrialstorageApplication 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 – Contaminant
25(3)NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
"Contaminant" includes any substance which is or could become corrosive, explosive, inflammable, radioactive or toxic and includes deposits of faecal or animal matter;
site-planningDefinitions – Floor
25(3)NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
"Floor" includes any base or structure between the surface of the ground, or the surface of any hardcore laid upon the ground, and the upper surface of the floor;
Definitions – Moisture
25(3)NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
"Moisture" includes water in liquid, solid, semi-solid or gaseous form but not flood water;
Definitions – 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';
dwellingDefinitions – Wall
25(3)NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
"Wall" means any opaque part of the external envelope of a building that is at an angle of 70º or more to the horizontal and includes piers, chimneys, columns and parapets which form part of the wall.
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-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 site preparation provisions
0.3NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The guidance in Section 2 is to ensure that the site is prepared and treated to prevent harmful effect on the building and on the health and safety of the occupants by requiring an appropriate site in
site-planningdrainageIntroduction 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-planningSubsoil drainage - Performance
0.5NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
It is the view of the Department that the requirements of regulation 27 will be met if the site of the building and the ground adjacent to it is drained by subsoil drainage as far as reasonably practi
drainagesite-planningSubsoil drainage and groundwater control
0.6NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The guidance in Section 4 is to prevent harmful effect on the building and the health of occupants by any existing active subsoil drainage which is disturbed by the development and then requiring the
drainagesite-planningMoisture and weather resistance performance requirement
0.7NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
It is the view of the Department that the requirements of regulation 28 will be met if the floors, walls and roofs are constructed to protect the building and secure the health and safety of persons i
protection-from-fallingFloor, wall and roof construction guidance for moisture resistance
0.8NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Section 5 contains guidance on the construction of floor types which will resist the passage of moisture from the ground. Section 6 contains guidance on the construction of wall types which will resis
drainageInterstitial 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.
dwellingventilationDefinitions
1.1NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
In this Technical Booklet the following definitions apply – Contaminant – is defined in regulation 25 in Part C of the Building Regulations. Drain – is defined in regulation 2 in Part A of the Buildin
drainageprotection-from-fallingmoisturecoastalSpecial considerations for buildings of historic or architectural merit
1.2NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Special considerations may apply where the building to which the work is to be carried out has historic or architectural merit and compliance with Part C of the Building Regulations would unacceptably
conservationGuidance for work to historic buildings
1.3NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
When undertaking work to or in connection with a building of historic or architectural merit, the aim should be to follow the guidance in this Technical Booklet to the extent that it is practicable. P
conservationdrainageSite Investigation Stages
2.1NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The nature and extent of site preparation will depend on the findings of the site investigation. The site investigation (relevant to Sections 2, 3 and 4 of this Technical Booklet) should consist of a
site-planningstructuralExtent and Level of Site Investigation
2.2NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The extent and level of investigation needs to be tailored to the type of development and the previous use of land. Typically the site investigation should include susceptibility to ground water level
site-planningstructuralCombined Geotechnical and Geoenvironmental Investigation
2.3NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Where the site is potentially affected by contaminants, a combined geotechnical and geoenvironmental investigation should be considered. Guidance on sites affected by contaminants is given in Section
site-planningSite Investigation Report Submission
2.4NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Where a site investigation report has been produced, a copy of the report should be given to the district council to facilitate the assessment of the submission.
site-planningRemoval of vegetable matter from ground
2.5NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Vegetable matter such as turf and roots should be removed from the ground to be covered by the building at least to a depth to prevent later growth. The harmful effect that vegetation roots may have o
site-planningprotection-from-fallingAssessment of existing site infrastructure
2.6NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
On sites previously used for buildings, consideration should be given to the presence of existing foundations, services, buried tanks and any other infrastructure that could endanger persons in and ab
site-planningstructuralAssessment of fill and made ground
2.7NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Where the site contains fill or made ground, consideration should be given to its compressibility and its potential for collapse on wetting, and to appropriate remedial measures to prevent damaging di
site-planningstructuralIntroduction 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-domesticdwellingApplication of regulation 26(1) - presumption of clean sites
3.3NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The application of regulation 26(1) is based on the presumption that the area of the land within the boundary of the site will be free from contaminants. It may be that the site was not contaminated o
site-planningDistrict 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
dwellingradon