top plate for a skillion roof (Figures 2 and 3).Most areas exceeding 100m but not exceeding 200m (refer to BS 6399-3): 1 kN/m² snow load & 0.9 kN point load. top plate for a couple-close roof (Figure 1b) Imposed loads (roof snow load and short-term point load) Altitude not exceeding 100m: 0.75 kN/m² snow load & 0.9 kN point load.
Typically built on site, rafters are cut to 2 x 10 pieces and land on a ridge board, which runs across the length of the building. This system is also called stick framing. Traditional rafters frame out the roof and connect to the exterior walls. ridge board for a couple-close roof (Figure 1a) A rafter is a structural component of a roof on a building.a default wind zone of extra high (EH) – a note within NZS 3604:2011 Table 10.1 indicates that rafter span lengths may be adjusted for other wind zones by multiplying factors of 1.3 for low and medium and 1.1 for high and very high wind zones.Ĭonnections that need to be considered are rafter (or jack rafter) to:.
HIP RAFTER PLUS
Glue the new rafter flush against the existing rafter, then use 16d nails plus a carriage bolt every 16 to affix the sistered rafter. When considering the fixings required (see Table 1), NZS 3604:2011 uses: A hip and valley roof framing is quite common in different St Clair Shores towns and villages. The length of the sistered rafter should extend at least 3’ past the problem area on the existing rafter, on both sides. However, finding the requirements for rafter fixings in skillion roofs, or for hip and valley rafters, is a little more circuitous.įigures 1–5 show the fixing requirements for the various roof framing elements. FINDING FIXING REQUIREMENTS for rafters in couple-close roof construction is fairly straightforward in NZS 3604:2011 Section 10 Roof framing.
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