Westcoast Windows Building Regulation datasheets for guidance when specifying our Swedish composite windows and doors – Approved Document B – Fire Safety
Designing your project for fire safety can be complex. We’ve put together advisory notes for consideration when specifying our Swedish designed and manufactured composite windows and doors to meet the requirements of Approved Document B – Fire Safety.
Approved Document B – Fire Safety is published in two volumes:
Volume 1 – Dwellinghouses
Volume 2 – Buildings Other Than Dwellinghouses
In both Volumes, Part B1 addresses Means of Warning and Escape and states: “The building shall be designed and constructed so that there are appropriate provisions for the early warning of fire, and appropriate means of escape in case of fire from the building to a place of safety outside the building capable of being safely and effectively used at all material times”
In both volumes, Part B1 Section 2 sets out requirements for Means of Escape and is applicable to new dwellings, extensions, material alteration of existing dwellings and change of use. Provisions are described for:
- ESCAPE FROM THE GROUND STOREY.
- ESCAPE FROM UPPER FLOORS NOT MORE THAN 4.5M ABOVE GROUND LEVEL.
- ESCAPE FROM UPPER FLOORS MORE THAN 4.5M ABOVE GROUND LEVEL.
- Windows should have an unobstructed clear opening area of at least 0.33m² and at least 450mm high and 450mm wide.
- The bottom of the openable area should be not more than 1100mm above finished floor level.
- Note – Approved Document K (Protection from falling, collision and impact) specifies a minimum guarding height of 800mm.
- Locks (with or without removable keys) and stays may be fitted to egress windows subject to the stay being fitted with a release catch, which may be child resistant.
- Windows should be designed such that they will remain in the open position without needing to be held by a person making their escape.
- In the case of escape from upper floors not more than 4.5m above ground level, windows should be accessible via a ladder.
- In the case of escape from upper floors more than 4.5m above ground level, alternative protected escape routes should be provided.
- In the case of replacement windows, the window opening should be sized to provide at least the same potential for escape as the window it replaces or it can be reduced to the minimum specified above.
DOWNLOAD OUR DATASHEET for typical details to meet the requirements for means of escape: Westcoast-Approved-Document-Part-B.pdf
Go to our DOWNLOADS page for window type data sheets for all the sizes that meet the minimum requirements for fire escape.
For further information visit the Government Statutory guidance page for Fire safety: Approved Document B: