TGD L 2011 – 2.1.4.2 – BUILDING FABRIC Air permeability

2.1.4.2 For material alterations or material change of use infiltration of cold outside air should be limited by reducing unintentional air paths as far as is practicable. Measures to ensure this include: – (a) sealing the void between dry-lining and masonry walls at the edges of openings such as windows and doors, and at the junctions with walls, floors and ceilings (e.g. by continuous bands of bonding plaster or battens); (b) sealing vapour control membranes in timber-frame constructions; (c) fitting draught-stripping in the frames of openable elements of windows, doors and rooflights; (d) sealing around loft hatches; (e) ensuring boxing for concealed services is sealed at floor and ceiling levels and sealing piped services where they penetrate or project into hollow construcions or voids. Diagram 3 illustrates some of these measures. Further information on sealing service penetrations can also be found in the Introduction Section of Acceptable Construction Details. Care should be taken to ensure compliance with the ventilation requirements of Part F and of Part J of the Building Regulations.

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