Bgc residential roof checklist

Rafter size, span and spacing correct (single span max 3200mm for 120x35 MGP10 with 900mm spacing)

Check that rafters, particularly hip rafters have not been bird mouthed more than D/3

Underpurlin spans correct roof load width (max 3200mm)

Wesbeam LVL size 83x51 single span 1400mm / continuous 1800mm

Wesbeam LVL size 96x51 single span 1800mm / continuous 2400mm

Underpurlin lapped over support min lap 450mm and fixed with 2-M10 bolts or 3 teks

Underpurlin to hip rafters intersection to have <br>* both underpurlins and the hip strutted or<br>* fixed via proprietary bracket as per fig 7.7

Collar ties located directly above all rows of underpurlins

Collar ties at every common pair of rafters (max 1200mm)

Where ceiling joists are not continuous across the residence they are to be lapped min 3D at support points and nailed together as per clause 7.1.2.1

Where ceiling joists are not continuous across the residence one of the following is to be undertaken <br>* ridge is to be strutted at 1800mm crs max or <br>*collar ties to be provided at every pair of rafters

Ceiling joists align with every second rafter and nailed together

Strutting beams with D/b 3 and hanging beams with D/b>7 to be laterally restrained at ends and strutting points as per clause 7.2.26

Struts installed as per clause 7.2.15

Strutting beam size and location as per engineering plans

Timber strutting and hanging beams not splayed to less than D/3 unless fixed in accordance with fig 7.3

Steel beam splayed may follow roof line (if greater than 22.5 degrees) subject to them complying with the following depth at support point <br>* up to 200 UB beams - 40mm min <br>* up to 250 UB beams - 60mm min <br>* up to 310 UB beams - 70mm min

Strutting beams not supporting ceiling loads have 25mm clearance of ceiling

Hanger beams to strutting or counter to be as per clause 7.2.6.2

Beams fixed according to timber roof notes as per Structerre engineering details

Spacing of tie downs (including over openings) complies with note 4.1<br>

For openings with widths as noted in the table the straps each side are to be full height for openings greater, check note 4.1.3<br>N1. 2.4-6m <br>N2. 2.4-4m<br>N3. 1.5-2m <br>N4. 0.6-1.35m<br>

Straps tight and nailed as per note 4.1.1 nails not pinched through straps

Strutting beams tied down as per note 4.5

Verandah alfresco and carport beams tied down as per note 4.2

Cavity columns in correct location and fixed as per detail

Internal wall tie downs <br>Strutting beams tied down as per note 4.5

Batten to rafter fixing as per note 4.8

Rafters to verandah alfresco and carport beams via triple grips

If strap fixed to wall plate, fix rafter to wall plate via triple grip

Rafter to underpurlin via triple grip

Underpurlin to strut to be fixed with strap over (or approved alternative)

Strut to strutting beam or wall plate via nail plates (or approved alternative)

Top plate to strutting beam via bolts or teks through holes provided as per note 4.1.1

Ridge and hip fixing as per note 4.6.5 (including hips to ridge)