Page 33 - Build 161

50 mm minimum
50 mm minimum
100 mm minimum
5° minimum slope
Barge ashings should be:
• 50 mm for L, M and H wind zones when roof pitch ≥ 10°
• 70 mm for all roof pitches in VH wind zones and L, M, H wind
zones where roof pitch < 10°
• 90 mm for all roof pitches in EH wind zones.
barge ashing to cover two full crests
50 mm minimum
Membrane under ashings (see Figure 4) must have a minimum cross-fall of 10° when used as an under ashing with a textured top coat – E2/AS1 6.5. (Note: BRANZ recommends 15° minimum).
Both metal and membrane cap ashings must:
● not have any penetrations
● overlap wall claddings on both sides by:
• 50 mm for L, M and H wind zones – E2/AS1 Table 7, Situation 1
• 70 mm for VH wind zones – E2/AS1 Table 7, Situation 2
• 90 mm for EH wind zones – E2/AS1 Table 7, Situation 3.
Saddle ashings
Fabricated saddle ashings are required:
● at the junction between a framed balcony wall
and an adjacent wall
● where parapets at di erent heights may
intersect (see Figure 5)
● at junctions of walls and joists for cantilevered
timber decks.
Details for saddle ashings are provided in E2/AS1 Figures 11 (which gives the internal corner ashing requirements below the saddle), 12 and 16.
Barge ashings
E2/AS1 barge ashings (see Figure 6) must have a minimum overlap over the barge or fascia board of:
● 50 mm for L, M and H wind zones where the
roof pitch is 10° or more – E2/AS1 Table 7,
Situation 1 and Figure 47
● 70 mm for L, M and H wind zones where the
roof pitch is less than or equal to 10° and all roof pitches for VH wind zones – E2/AS1 Table 7, Situation 2 and Figure 47
Figure 5
saddle ashing 50 mm minimum
Fabricated saddle ashing to framed balcony/wall junction or at intersection between di erent height parapets.
kick-out to ashing edge to provide drip edge
roo ng
5 mm minimum gap (edge of downturn to roo ng)
roof underlay roof framing
bargeboard
Barge ashing.
so t lining
Figure 6
Build 161 — August/September 2017 — 31