Transcription of Constructing Cavities - Building Performance
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Constructing Cavities for wall claddingsTo be read in conjunction with Acceptable Solution E2/AS1 IntroductIon 1 2 .0 What does a cavIt y do? 2 th e 4ds 2 Wh en I s a cavIt y n eeded? 4 InstallIng Wall un derl ays 4 Flexible wall underlays 5 Rigid wall underlays 8 cavIt y bat tens 9 Timber cavity battens 9 Polystyrene cavity battens 9 Positioning battens 9 Support for vertical fixings 9 Support for horizontal fixings 11 Fixing battens 11 closIng off th e top of th e cavIt y 12 dr aInage an d ventIl atIon 13 cavIt y Walls over t Wo stor eys 17 InstallIng WIn doW an d door joIn ery 17 aIr seals 19 12.
Table 23 (’Properties of roof underlays and building wraps‘). Install the wall underlay directly over the framing. Install the cavity battens directly over the wall underlay as described in Cavity battens on page 9. No additional wall underlay is needed between the wall cladding and the cavity battens except in the following situations.
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