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Resistance to moisture
2.13NI-wide·Technical Booklet B Materials and Workmanship
Any material which is likely to be adversely affected by moisture from the ground, weather or condensation will be suitable if – (a) the construction will resist the passage of moisture to the materia
materialsdrainageprotection-from-moistureTable 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-moistureGeneral - Scope of moisture resistance guidance
6.1NI-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 and the resistance to the passage of moisture from the outside caused by the weather in relation to the followi
protection-from-moistureall-buildingsRequirements for walls to resist moisture
6.2NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Walls should – (a) resist the passage of moisture from the ground to the inside of the building; and (b) not be damaged by moisture from the ground and not carry moisture from the ground to any part o
protection-from-moistureexternal-spaceDamp proof course requirement for ground moisture resistance
6.3NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Any internal or external wall should meet the requirement to resist the passage of moisture from the ground if a damp proof course is provided.
protection-from-moisturedrainageInternal and external wall construction for ground moisture resistance
6.4NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
An internal or external wall should meet the requirement to resist the passage of moisture from the ground if it is constructed as follows (unless it is subject to ground water pressure, in which case
protection-from-moisturedrainageCracking in external walls
6.19NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Severe rain penetration may occur through cracks in masonry external walls caused by thermal movement or by subsidence. The possibility of this occurring should be taken into account when designing a
external-spaceprotection-from-moistureCladding systems for external walls - general requirements
6.20NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Cladding systems for walls should – (a) resist the penetration of precipitation to the inside of the building; and (b) not be damaged by precipitation and not carry precipitation to any part of the bu
external-spaceprotection-from-moistureCladding design principles for weather protection
6.21NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Cladding can be designed to protect a building from precipitation (often driven by the wind) either by holding it at the face of the building or by stopping it from penetrating beyond the back of the
external-spaceprotection-from-moistureCladding materials and construction methods for weather resistance
6.22NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Any cladding will meet the requirement to resist the weather if – (a) it is jointless or has sealed joints, and is impervious to moisture so that moisture will not enter the cladding (such as metal, p
external-spaceprotection-from-moistureDurability and quality of cladding materials
6.23NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Some materials can deteriorate rapidly without special care and they should only be used as the weather resisting part of a cladding system if certain conditions are met (see Part B Materials and work
external-spaceprotection-from-moistureVentilated cavity for impermeable cladding
6.24NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Where cladding is impermeable to water vapour there should be a ventilated cavity behind it.
external-spaceprotection-from-moistureventilationMovement allowance in jointless and sealed cladding
6.25NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Jointless materials and materials with sealed joints should allow for structural and thermal movement.
external-spaceprotection-from-moistureDesign of dry joints in cladding
6.26NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Dry joints between cladding units should be designed so that precipitation will not pass through them, or the cladding should be designed so that precipitation which enters the joints will be directed
external-spaceprotection-from-moistureFixing of cladding sheets and tiles
6.27NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Each sheet, tile and section of cladding should be securely fixed. Guidance as to appropriate fixing methods is given in BS 8000-6. Particular care should be taken with detailing and workmanship at th
protection-from-moistureexternal-wallscladdingInsulation in cladding construction
6.28NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Insulation can be incorporated into the construction provided it is either protected from moisture or is unaffected by it.
insulationcladdingprotection-from-moistureVentilation behind timber-supported cladding
6.29NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Where cladding is supported by timber components or is on the façade of a timber framed building, the space between the cladding and the building should be ventilated to ensure rapid drying of any wat
claddingprotection-from-moistureventilationtimber-framedResistance to moisture by reference to British Standards
6.30NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The requirement to resist the passage of moisture from the weather can also be met by following the relevant recommendations of – (a) BS CP 143 for sheet roof and wall coverings made from the followin
claddingroofingprotection-from-moistureJoints at doors and windows in external walls
6.31NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The joint between walls and door or window frames should – (a) resist the penetration of precipitation to the inside of the building; and (b) not be damaged by precipitation and not permit precipitati
protection-from-moistureexternal-wallswindowsdoors