Every rule your project must meet, found for you.
Search Northern Ireland’s planning and building-control guidance, ask a question in plain English, or generate a project compliance checklist — every answer cited to the source.
Working to a specific project? Generate a compliance checklist →
Answers, with citations
Ask in plain English and get an answer that links to the exact source clause — never an unsourced guess.
Scoped to your council
Overlay a council's local development plan on the Northern Ireland-wide regulations and policy.
Project compliance checklist
Characterise a project and get the requirements that apply, grouped by work area. Try it →
The library
Search the source guidance
15 results · filtered
Requirements 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-spaceExternal 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-domesticExternal solid walls in severe exposure conditions
6.10NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
An external solid wall in conditions of "severe exposure" should be constructed with – (a) brickwork or stonework at least 328 mm thick, dense aggregate concrete blockwork at least 250 mm thick, or li
site-planningprotection-from-fallingexternal-spaceExternal solid walls in very severe exposure conditions
6.10NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
An external solid wall in conditions of "very severe exposure" should be protected by external impervious cladding.
site-planningprotection-from-fallingexternal-spaceExternal cavity walls moisture prevention
6.13NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
An external cavity wall should meet the requirement if the outer leaf is separated from the inner leaf by a drained air space, or in any other way which will prevent precipitation from being carried t
drainageexternal-spaceExternal cavity wall construction components
6.14NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The construction of external cavity walls could include – (a) an outer leaf of masonry (bricks, blocks, stone or manufactured stone); (b) a cavity at least 50 mm wide. The cavity is to be bridged only
drainageexternal-spaceAlternative cavity wall guidance
6.15NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
The requirement can also be met by following the relevant recommendations of BS 5628-3. The code describes factors affecting rain penetration of cavity walls.
drainageexternal-spaceCracking 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-moisture