BS 9250:2007 provides guidance on methods that can be used to meet the “well sealed ceiling” requirements for cold and warm pitched roofs.
Applicable to architects, house builders, and building control officers it outlines robust design details for the construction of more airtight ceilings and for the control of air movement into pitched roofs.
BS 9250 provides guidance for dwellings and domestic buildings on the selection of materials, design principles, construction methods and design details covering: the junction of walls and ceilings; junctions of ceiling materials; penetration through ceilings (e.g. pipes, outlets, cables, light fittings, loft hatches, tubular rooflights and roof windows). It also includes cold and warm roof applications and will apply to new, and the refurbishment of existing, buildings.
List of content and figures for BS9250
Foreword iii
1. Scope
2. Normative references
3. Terms and definitions
4. Design criteria
5. Materials, fittings and accessories
6. Design details and installation
Annexes
Annex A (informative) Requirements for airtightness and control of condensation in the Building Regulations
Bibliography
List of figures
Figure 1 – Defining the conditioned zone in a cold-roof building
Figure 2 – Defining the conditioned zone in a warm-roof building
Figure 3 – Joint in AVCL as a membrane with solid support, sealed using adhesive or double-sided tape
Figure 4 – Joint in AVCL as a membrane with solid support, sealed using adhesive or double-sided tape and secured with a compression batten
Figure 5 – Joint in AVCL as a membrane without solid support, sealed using adhesive tape (non-preferred solution)
Figure 6 – Continuity of AVCL ensured at stud partition
Figure 7 – Continuity of AVCL ensured at a purlin
Figure 8 – Joints in an air barrier formed by bevel-edged plasterboard, joined at a joist or rafter
Figure 9 – Joints in an air barrier formed by square-edged plasterboard, joined at a joist or rafter
Figure 10 – Ensuring an air-tight seal at the junction of a masonry cavity wall and ceiling using air-impermeable foil or lining paper
Figure 11 – Ensuring an air-tight seal at the top of a masonry cavity wall using plasterboard jointing tape (cold roof)
Figure 12 – Joints in an air barrier formed by a plasterboard-lined timber frame wall using plasterboard tape
Figure 13 – Joints in an air barrier formed by plasterboard lining a metal frame wall (cold roof)
Figure 14 – Joint in an air barrier formed by plasterboard lining an internally insulated wall (cold roof)
Figure 15 – Joint in an air barrier formed by plasterboard lining an externally insulated wall (cold roof)
Figure 16 – Join in a plastered masonry cavity wall using plasterboard jointing tape
Figure 17 – Join in a plastered internal block wall using plasterboard jointing tape
Figure 18 – Ensuring an air-tight seal at the top of a masonry cavity wall below a warm roof
Figure 19 – Warm roof construction with a small void above insulation
Figure 20 – Illustrative detail of a pipe penetration with collar
Figure 21 – Illustrative detail of a cable penetration with support and grommet
Figure 22 – Example of a pendant light fitting
Figure 23 – Example of a flush light fitting
Figure 24 – Example of a recessed light fitting showing a sealed hood or box
Figure 25 – Illustrative detail of a drop-down loft hatch with seals
Figure 26 – Illustrative detail of a tubular rooflight
Figure 27 – Illustrative detail of a sealed ventilation duct in a ceiling
Figure 28 – Illustrative detail of a window in a warm roof