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
7 results · filtered
General requirements for roofs
7.1NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Roofs should – (a) resist the passage of moisture caused by the weather to the inside of the building; and (b) not be damaged by the weather and not carry precipitation to any part of the building whi
moisture-protectionRoof design approach for weather protection
7.2NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Roofing can be designed to protect a building from the weather either by holding the precipitation at the face of the roof or by stopping it from penetrating beyond the back of the roofing system.
moisture-protectionAcceptable roof materials and construction methods
7.3NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Any roof will meet the requirement if – (a) it is jointless or has sealed joints, and is impervious to moisture (including metal, plastic, glass and bituminous products) so that moisture will not ente
moisture-protectionVentilation behind impermeable cladding
7.4NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Where cladding is impermeable to water vapour there should be a ventilated air space behind the cladding.
moisture-protectionventilationMovement allowance in jointless and sealed roof materials
7.5NI-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.
moisture-protectionDry joint design for roofing systems
7.6NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Dry joints between roofing sheets should be designed so that precipitation will not pass through them, or the system should be designed so that precipitation which enters the joints will be drained aw
moisture-protectionFixing of roof sheets, tiles and sections
7.7NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Each sheet, tile and section of roof should be fixed in an appropriate manner. Guidance as to appropriate fixing methods is given in BS 8000-6.
moisture-protection