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4.7.3 Building work 4.7.3.1 New building Figure 4.11 Pre-install pipework before building claddings are installed The best time to install pipework and cables in a new building is when it is still under construction. Co-ordinate with the other trades and plan the layout and location of the system early in the building design stage so that penetrations through the building envelope can be made before the cladding is installed (Figure 4.11 – note that the penetration through the wall underlay has not incorporated a sleeve and has not yet been taped off with flexible flashing tape). Building Code acceptable solution E2/AS1 gives guidance on making penetrations through the wall cladding and wall underlay – a copy is available for free download from the compliance documents section of the Department of Building and Housing website. The installer making the penetration through the wall cladding system is responsible for the weathertight performance of the penetration made – they will be liable for any non-performance due to their work. Any drilling, notching or cutting of load-bearing and support walls to fit pipes must be within the limits specified by NZS 3604 Timber framed buildings. Figure 4.12 outlines the maximum permitted allowances for drilling and notching. Figure 4.12 Permitted notching and drilling of timber framing allowed under NZS 3604 Wall plates 70 x 50 mm top or bottom plate 19 mm max. diameter Studs 75 x 50 mm stud 19 mm max. depth 19 mm max. depth for max. 200 mm length or 22 mm cut for diagonal metal brace 19 mm max. depth 25 mm max. diameter 25 mm max. depth 100 x 50 mm top or bottom plate 100 x 50 mm stud 25 mm max. diameter 25 mm max. depth for max. 200 mm length or 35 mm for a max. of three consecutive studs Note: Notches in studs to be spaced at a min. of 600 mm apart. 4.7.3.2 Existing building When installing units into an existing building: • Identify the location of existing pipework, studs and cables before drilling holes or making penetrations in the building. • Ensure any drilling, notching or cutting of load-bearing and support walls to fit pipes is within the limits specified by NZS 3604 Timber framed buildings (shown in Figure 4.12). 25PDF Image | Heat pump installation Good Practice Guide
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