E2/AS1 External Moisture

Wind zone

Not set

Nothing saved yet. Answer the matrix for an elevation and Save it; the building is what is saved.

No roof pitch yet. Set it in the project: the minimum pitch check waits on it, and in Low to High wind zones so does the flashing Situation. Set the roof pitch

1. Roof cladding

   Pick the roof cladding to read Part 8 for it.

   8.1.1.2, 8.1.1.3

Exposure zone

Not set

1. Exposure zone

   Table C.1.1.1A reads by exposure zone, and the project has none. Set it in the project.

   Table C.1.1.1A, 2.1.1.1 b), 4.2.1.2

Exposure zone

Not set

In contact, Table C.1.1.1B

• ●satisfactory in contact
• ◐contact to be avoided in sea-spray zones, exposure zones D and E
• may not touch: a gap of at least 5 mm

2. Coated includes factory-painted, coil-coated and powder-coated.
3. Includes copper azole and copper quaternary salts.

Run-off, Table C.1.1.1C: water from the row onto the column

• ●satisfactory
• ◐may etch or stain the glass
• not permitted

2. Coated includes factory-painted, coil-coated and powder-coated.
3. Includes copper azole and copper quaternary salts.

What the run-off table's marks meanTable C.1.1.1C note (1), Table C.1.1.1B note (1)

Table C.1.1.1C's key is Table C.1.1.1B's, word for word, apart from the sentence about its letter A: a tick is "satisfactory in contact", a cross "contact between materials is not permitted", with the same 5 mm gap to prevent moisture bridging. So the run-off table never says what its marks mean for water running off. This page reads a tick as run-off permitted and a cross as not, and does not carry the gap across, since a gap does not stop water running from one material onto another.

The pair picked

1. Compatibility

   Click a cell of either grid to read the pair out: whether the two may touch, and what happens when water runs from one onto the other.

   Table C.1.1.1B, Table C.1.1.1C, 4.2.1.3

Wind zone

Not set

Roof pitch

Not set

Situation

Not read

Apron cover X

–

Table 4.5.1.1

Barge and capping Z

–

Table 4.5.1.1

Roof-to-wall upstand

–

Table 4.5.1.1, 4.4.3

1. Situation

   No wind zone, so no Situation: Table 4.5.1.1 reads its column by the wind zone. Set it in the project.

   Table 4.5.1.1 notes (1)–(3)

The junction groups are this tool's; the lines under each are the table's, in its order. A reference beside a line is a paragraph of Section 9.1 that repeats the same number.

1. Eaves widths Eaves widths are dimensioned horizontally from the cladding face to the outer edge of the gutter or fascia.

   Table 3.1.2.1 note (1)

2. Wall claddings Every wall cladding is one of the eight systems of Section 3.1.4; any other is outside E2/AS1.

   3.1.4.1, 3.1.4.2

3. Metal flashings Metal flashings to the dimensions of Table 4.5.1.1 for the site's Situation, with edges folded to a kick-out or bird's beak, joined to Figure 4.4.4.1 with expansion joints where 4.4.4.1 b) asks for them.

   4.4.3.1, 4.4.3.2, 4.4.4.1, Figure 4.4.4.1

4. Pipe and service penetrations Flashed to Figures 9.1.8.3A and 9.1.8.3B, with flashing tape to 4.2.12 and neutral-cure sealant.

   9.1.8.3, Figures 9.1.8.3A and B, 4.2.12

1. Windows and doors Aluminium frames with horizontal heads. Any one frame no more than 5000 mm (5 m) wide × 5000 mm (5 m) high and 13.5 m² with its sill above the floor, or 6000 mm (6 m) wide and 16 m² with its sill at floor level. Beyond that is specific design.

   9.1.9.1

2. Windows and doors Units to the Building Product Specifications 4.4.1, reveals to NZS 3602; fixed in pairs through the reveals at 450 mm centres and within 150 mm of the reveal ends, packed at every fixing except head to lintel.

   9.1.9.2, 9.1.9.10 a) i), BPS 4.4.1

3. Openings Flexible wall underlay dressed into every opening and flexible flashing tape on the head and sill framing; a flexible air seal between reveal and framing over a backing rod; the head flashing finished to the underlay with tape or a lapped strip.

   9.1.4.1, 9.1.5.1, 9.1.10.1

4. Flexible wall underlay Run horizontally, upper sheets over lower, lapped 75 mm at horizontal joints and 150 mm over studs at vertical joints, extending 35 mm below the bottom plate or bearer.

   9.1.6.1, Table C.2.1.1

1. Flexible wall underlay Run horizontally, upper sheets over lower, lapped 75 mm at horizontal joints and 150 mm over studs at vertical joints, extending 35 mm below the bottom plate or bearer.

   9.1.6.1, Table C.2.1.1

1. Windows and doors Aluminium frames with horizontal heads. Any one frame no more than 5000 mm (5 m) wide × 5000 mm (5 m) high and 13.5 m² with its sill above the floor, or 6000 mm (6 m) wide and 16 m² with its sill at floor level. Beyond that is specific design.

   9.1.9.1

2. Windows and doors Units to the Building Product Specifications 4.4.1, reveals to NZS 3602; fixed in pairs through the reveals at 450 mm centres and within 150 mm of the reveal ends, packed at every fixing except head to lintel.

   9.1.9.2, 9.1.9.10 a) i), BPS 4.4.1

3. Openings Flexible wall underlay dressed into every opening and flexible flashing tape on the head and sill framing; a flexible air seal between reveal and framing over a backing rod; the head flashing finished to the underlay with tape or a lapped strip.

   9.1.4.1, 9.1.5.1, 9.1.10.1

Risk score3.1.2, Table 3.1.2.1, Table 3.1.3.1, Figure 3.1.1.1

The six factors of Table 3.1.2.1 (wind zone, number of storeys, roof/wall intersection, eaves width, envelope complexity and deck design), each read to a level, each level scored by Table 3.1.3.1, and the six subtotals added. Calculated for each external face, the way Figure 3.1.1.1 draws it.

BandTable 3.1.3.2, 3.1.3.2

The row of Table 3.1.3.2 a face's score lands in (0 to 6, 7 to 12, 13 to 20) and with it which claddings may be direct fixed and which go over a drained cavity. Over 20 is specific design. 3.1.3.2 allows the highest face's score to be used for every face.

Wind zoneTable 3.1.2.1 A, NZS 3604 Section 5, 1.1.1.1

NZS 3604's five zones (Low, Medium, High, Very High and Extra High) read for the site and scored as row A of Table 3.1.2.1. A site beyond Extra High is beyond E2/AS1, which 1.1.1.1 limits to buildings within NZS 3604.

Exposure zoneTable C.1.1.1A note (1), Table C.1.1.1A note (4), NZS 3604 Section 4

NZS 3604's Zones B, C and D, set by how much wind-driven sea spray reaches the site, plus Zone E, beachfronts with breaking surf, which E2/AS1 adds for choosing claddings. Table C.1.1.1A reads what a material may do by it.

SituationTable 4.5.1.1 notes (1)–(3)

Table 4.5.1.1's three columns, set by its notes (1) to (3): the wind zone, and in Low, Medium and High zones the roof pitch either side of 10°. A site reads one column of flashing dimensions.

Eaves widthTable 3.1.2.1 D, Table 3.1.2.1 note (1), Table 3.1.2.1 note (2)

Row D of Table 3.1.2.1: measured horizontally from the cladding face to the outer edge of the gutter or fascia, and read against the height of the wall the eaves protect. A parapet or enclosed balustrade counts as 0 mm.

Drained cavity9.1.7, Table 3.1.3.2 note (2), Table 3.1.3.2 note (7)

A nominal 20 mm space between the wall underlay and the cladding, formed with vertical battens, vented and drained at its base and closed to the roof space and subfloor, Subsection 9.1.7. Required over parapets and in Extra High wind zones; vertical corrugated steel counts as cavity construction.

Direct fixedTable 3.1.3.2, 9.1.9.4, 9.1.9.5

A cladding fixed to the framing through the wall underlay with no cavity behind it (the left column of Table 3.1.3.2), with its windows on jamb battens and a stand-off sealed down the jambs.

Hook or hem4.4.3.2, 4.4.3.3, 4.4.3.4

The folded edge on a flashing upstand to Figure 4.4.3.2. In Low to Very High wind zones an upstand either has one or is 25 mm taller than Table 4.5.1.1 prints; in Extra High it has one and is 25 mm taller.

Seismic zoneTable 9.2.7.1A, NZS 3604 Figure 5.4

NZS 3604's earthquake zones 1 to 4, read for the site. Table 9.2.7.1A reads the veneer tie type and spacing by it.

Exposure zonesTable C.1.1.1A note (1), NZS 3604:2011 4.2.1, NZS 3604:2011 4.2.3.3, NZS 3604:2011 Figure 4.1, Table C.1.1.1A note (7)

Zones B, C and D are NZS 3604's, set by how much wind-driven sea spray reaches the site. A site is Zone D within 500 m of the sea, harbours included, or within 100 m of a tidal estuary or sheltered inlet, and on every offshore island; elsewhere the standard's map decides, and a microclimate that makes it worse takes the site to specific engineering design. Corrosion from industrial or geothermal atmospheres is outside E2/AS1 altogether.

Zone ETable C.1.1.1A note (4), NZS 3604:2011 C4.2

Zone E, beachfronts with breaking surf, is E2/AS1's own, added for choosing claddings. NZS 3604 stops at D because it asks the same protection of structural fixings in both. A site in Zone E takes the metal supplier's durability information as well.

Where a roof becomes a wallH1/AS1 Definitions, roof; E2/AS1 Definitions, roof and external wall; E2/AS1 1.1.1.1 c); C/AS1 and C/AS2 Definitions, external wall

H1/AS1 and E2/AS1 define a roof the same way: a surface at 60° or less to the horizontal. C/AS1 and C/AS2 come at the same line from the other side, defining an external wall as any exterior face within 30° of vertical, and say that this includes a roof. Both definitions take in 60° itself, so a face pitched at exactly 60° is a roof for energy efficiency and weathertightness and an external wall for fire. Steeper than 60°, it is not a roof to H1/AS1, and C treats it as an external wall. E2/AS1 goes further than a definition: its scope is limited to buildings whose external walls are vertical and whose roofs are 60° or less (1.1.1.1 c)), so a building with any face between 60° and vertical, a mansard for one, is outside E2/AS1 altogether, and its weathertightness has to be shown some other way, such as an alternative solution.

MBIE's guide to using the risk matrix (July 2013) explains the six factors with drawings and three more worked examples. It is numbered against the 2011 edition: its Tables 1, 2 and 3 are now 3.1.2.1, 3.1.3.1 and 3.1.3.2.