Published: 2017-07-21 09:15:17 - Exported: 2024-09-04 16:43:42 | NB | The information on this sheet once printed/exported is classed as an uncontrolled copy. The currency of the information should be checked by visiting the ESFG website prior to using the information for any purposes.

Published: 2017-07-21 09:15:17 - Exported: 2024-09-04 16:43:42 | NB | The information on this sheet once printed/exported is classed as an uncontrolled copy. The currency of the information should be checked by visiting the ESFG website prior to using the information for any purposes.

Published on NSW Department of Education - EFSG (https://dec-staging.sitback.com.au)

SG421

Roofing - Profiled Sheet Metal

GUIDE NOTE: Refer to DG / FABRIC and DG / ROOFING sections.

ID
Title
Compliance Level
Expand All
1
General
Mandatory
Mandatory

As per current NATSPEC.

2
Products
Mandatory
Mandatory

As per current NATSPEC except as follows:

2.1 Components


Fasteners

GUIDE NOTE: Refer to manufacturers technical bulletins for fasteners for roofing (eg: bluescope’s technical bulletin tb-16)

Screws and fasteners - Standard Colorbond grade roof sheeting: Use only self-drilling and tapping screws to AS 3566 class 3  of the types and sizes indicated in the roof manufacturer’s printed technical data sheets.

Screws and fasteners - Ultra Colorbond grade steel roof sheeting: Use only self-drilling and tapping screws to AS 3566 class 4 of the types and sizes indicated in the roof manufacturer’s printed technical data sheets.
 

Thermal break
A metal roof with metal purlins or metal battens, to which the ceiling lining is fixed directly underneath must have a thermal break installed between the metal purlins or metal battens and the metal deck roofing; consisting of a material with an R-Value of not less than 0.2.

2.2 Sheet Metal Roofing


Roofing product

GUIDE NOTES:

Colorbond ultra steel roof sheeting is required in severe ENVIRONMENTs (eg generally 100 to 200 metres from A surf beach) refer to THE manufacturer’s technical publications (Eg: Bluescopes tb-1a), and relevant Australian standards (eg. AS 1397 and as 2728) Amend the specification description accordingly.

All metal roofing must have a minimum BMT (Base metal thickness) of 0.48 mm (0.42 mm BMT Metal Roofing is not permitted). 

Thickness, Base Metal Thickness (BMT) (mm): 0.48.

GUIDE NOTES: 

Glare is a major issue in schools.  select colours that do not cause unacceptable glare (eg Off whites, light grey and other light colours are generally unacceptable).

Select standard colours.  (a) the selection of non standard colours may result in:SIGNIFICANT cost increases (B) small orders are virtually impossible to colour match at a later date. (eg replacement sheets or extensions) 

2.6 Skylights
 

A.

Description
Industrial glass fibre reinforced polyester (GRP) fire retardant roof sheeting.

Twin walled polycarbonate thermal barrier.
Prismatic diffuser panel at ceiling level.
 

Roof material
Fire retardant solar controlled laminated glass fibre reinforced polyester (GRP) roof sheeting.

Profile: To match adjacent roof sheeting.
Weight:

GUIDE NOTE: Refer to manufacturer's printed span and wind load table, to determine correct sheet weight series  (g/m2). Include and/or delete weights as applicable. Generally 2400 g/m2

  • 2400 g/m2
  • 3050 g/m2
  • 3660 g/m2
Colour: Pearl
 

Light Transmission (nominal):

GUIDE NOTE: Include and/or delete weights and percentages as applicable (see above). Generally 2400 g.s.m 

  • 2400 g/m2. 40%
  • 3050 g/m2. 38%
  • 3660 g/m2. 36%.
Fire retardant resin system: Proprietary fire retardant resin incorporated into the roof sheeting during manufacture.
  • Identification: Coloured thread embedded along the entire side rib of each sheet to identify that it complies with the required fire hazard indices.
Fire resistance – Fire hazard properties – School buildings: To be in full compliance with BCA requirements for the applicable location.
 
Sheet dimensions: To AS/NZS 4256.3 and manufacturer’s standards.
  • Roof sheeting to be cut to width by the manufacturer during production.  The sheeting to be cut within the following tolerances:
    •   Overall width: -/+ 5.0mm per sheet length
    •   Cover Width: -/+ 5.0mm per sheet length
    •   Nominated length: -/+10,-0mm
    •   Squareness (over sheet ends): -5mm per metre width
    •  Site cutting: Longitudinal cutting (sheet width) must not be undertaken on the site.

Compliance: Provide a manufacturer’s certified Certificate of Compliance for the following:

  •  Fire
    •  Resin supplier
    •  Resin batch number
  •  Product
    •  GRP description
    •  GRP code
    • Date of manufacture

Clear sheeting under translucent roofing

Type: Impact resistant, twin walled clear polycarbonate structured clear sheeting installed above the clear prismatic diffuser.

Standards: To AS/NZS 4256.5
 
Fire resistance – Fire hazard properties – School buildings: To be in full compliance with BCA requirements for the applicable location.
 
Thickness: 8 mm
 
Colour: Clear
 

Diffuser panel

Type: Clear prismatic diffuser panel at ceiling level
 
Fire resistance – Fire hazard properties – School buildings: To be in full compliance with BCA requirements for the applicable location.
 
Prism: 4.5mm (nominal) square base female conical prism parallel and perpendicular to the length and width of the panel.
  • Finish colour: White

​B.

GUIDE NOTE: If applicable create new clause number and insert in appropriate place. 

Standard
General: To AS 4285.

Description
Tubular Daylighting System consisting of 2 (two) roof mounted Domes (External and Inner Domes) aluminium tubes, transition box with daylight dimmer, and ceiling diffuser assembly flush with ceiling, transferring sunlight to interior spaces.

Roof Dome
Variable prism optics moulded into outer dome to capture low angle sunlight and limit high angle sunlight with transparent, UV and impact resistant inner dome. 3.7 mm minimum thickness injection moulded acrylic, classified as CC2 material; UV inhibiting, impact modified acrylic blend with EDCS (Effective Daylight Capture Surface)of 4838cm2 (750 square inches)

Flashing
Flashing base to be moulded to suit roof profile along with separate moulded Hub to support top of tubes and Domes.

Flashings to be coloured to match metal roofing colour.

Tubing
Nominal diameter: 530mm

Reflective aluminium sheet tubing 0.5mm thick, nominally 600 mm long and cut to size to suit site dimensions.

Internal finish: 99.7% high reflectance specular finish on exposed reflective surface. Visible spectrum (400 nm to 760 nm) greater than 99 percent.

Total solar spectrum (400 nm to 2500 nm) less than 93 percent.

Transition Box
Ceiling mounted box transitioning from round tube to square ceiling assembly with supporting light transmitting surface at bottom termination of tube; 605mm x 605mm square frame to fit flush with selected metal strip ceiling.

Daylight Dimmer: Electro-mechanically actuated daylight valve; for universal input voltages ranging between 90 and 277 V at 50 or 60 Hz; maximum current draw of 50 ma per unit; controlled by low voltage, series Type T02: circuited, 4 conductor, size 22 cable; providing daylight output between 2 and 100 percent.

Provide Daylight Dimmer Switches (1 Switch controls up to 10 units).

Low voltage switch (white) required to operate Daylight Dimmer.  Note: only one switch is required per set of synchronously controlled dimmers.

Daylight Dimmer Cables. Two conductor low voltage cable (150m.) for multiple unit DC connection.

Diffuser
Fresnel lens designed to maximize light output and diffusion. Visible Light Transmission shall be greater than 90 percent at 0.6 mm thick. Classified as CC2.

 

Performance Tested: NFRC (National Fenestration and Ratings Council). Meets SHGC and U-Value requirements set out in the BCA (Building Code of Australia) tables 3.12.1.2 and J1.4. SHGC = 0.20 U-Factor = 2.67

2.9 Roof Ventilators
 

A. 

Rotary roof ventilator

GUIDE NOTE: Liase with specialist consultants for ventilator selection and placement 

Location
Refer to drawings.

Number and size

Description
Rotating wind-driven roof mounted ventilator/s including power operated dampers, fixings, trim and flashings.  Finish to match adjacent roofing.

 
Bearings: Precision roller bearing type. The bearings to be located in the ventilator so that the inner case and the outer case remain parallel at all time.
  •  Fully isolated from the environment
  • Steel or stainless steel
  •  Minimum two races of roller bearings
  •  Permanently lubricated
  •  Shaft:  Aluminium machine grade 2011 T3 or stainless steel grade 316
Base: Tapered square to round (base/throat) construction to match roof profile and pitch.
 
Construction, Type: Spot-welded or mechanically fastened at all points of connection.
 

Performance classification
Rain resistance: Class A to AS4740

Effective Aerodynamic Area: Class 2 to AS4740 as minimum.
 
Performance tests: To AS4740 and conducted by a NATA accredited laboratory.
 
Test Reports: Submit performance test report when requested.
 

Corrosive locations

Within 3 km from surf beaches.
 
Within 1 km from bay beaches.
 
Highly industrialised areas.
 
Material: Roof ventilators in corrosive locations are to be of aluminium construction.
  •  Turbine and Base:  Aluminium grade:  5005 H34
  •  Finish: Powder coated.
Flashing
In accordance with manufacturers printed instructions.
 

Damper
Location: Inside throat

Operation: Motor driven operation via a 240V AC, 50 Hz nominal 3 W rated motor driving and holding in either the fully open or fully closed position
 
Switches: Supplied from an external changeover switch so that either the “open” or the “close” switch-wire will be continuously energised from a 240V supply.
 
Wiring: Prewired and fit with a minimum 1.0 m long 4 core flexible cable with a 4 pin plug top with cores for a 240V “open” switch-wire, 240V “close” switch-wire, neutral and earth.  (The socket, changeover switch and all wiring on the line side of the socket forms part of the building work).
 
Switch: Control switches are required on the basis of one switch per space, and are to be a single gang plate labelled ROOF VENTS containing a two-way switch with a position also machined engraved and filled as OPEN - SUMMER and CLOSED- WINTER.  Each control switch is to be at the standard lighting switch height adjacent to the ceiling fan controller.
 

Drawing reference
>

Wiring and socket: Wire a 240V open switchwire (summer), 240V closed switchwire (winter), neutral, and earth to a 4-pin socket adjacent to each damper motor.  The type of socket and connection diagram are as required by the damper motor supplier.

Supply: Provide a separate circuit on the relevant switchboards for motor driven dampers.
 

Register /ceiling grille
Refer to SG / LINING

Refer to SG / SUSPENDED CEILINGS

Guarantee

Minimum 10 year written guarantee on replacement of rotary roof ventilator if defective.  The guarantee must cover the following ventilator failures:

  •  Base
  •  Bearing/s
  •  Domed top (if applicable)
  •  Sufficient rotation to repel water
  •  Water/moisture penetration
  •  Surface finish
Distribution: Hand one copy to the Principal’s Authorised Person / Principal’s Representative.
 

Information and marking
Standard: To AS/NZS 4740 Section 4

Certification
Provide test reports confirming compliance with the required specified performance classification requirements.

B. 

Roof smoke ventilators

GUIDE NOTES:

Create new clause and insert in appropriate place. 

The Roof smoke ventilator described below is based on IVR's Ipv/Irl series ROof smoke ventilator with SDL (sound deadened lids) that has a certifcation from a NATA accredited testing laboratory. Other proprietary Roof smoke ventilator that comply with the specification requirements described below may also be acceptable. 

Location
Refer to drawings

Description

Proprietary roof mounted smoke ventilator/s with remote operating dampers including fixings, trim and flashings.

Finish: Match adjacent roofing.


Standards

Comply with the BCA NSW H101.22 and be capable of opening against a resistance load of 0.48 Kpa/m2 and remain set against 1.44 Kpa/m2 uplift pressure.

Tested to: AS2428.1,2,3,4,5 and AS2427
 

Construction
Fabricate from aluminium zinc coated steel sheet material with stainless steel and nylon pivots, bearings etc.  Spot welded or mechanically fastened at all points of connection.

Operation: Automatic fusible link operation at 710 maximum temperature.

Certification
Provide a certificate of compliance.

 

2.11 Rainwater Tanks
 

GUIDE NOTES: 

Above ground tank installations are preferred

Refer to the NATSPEC Building Template - Hydraulic Design and Install.

Metal tanks and rainwater goods : to AS/NZS 2179.1 and SAA HB 230 

Tanks to contain potable water: to AS2070 and AS/NZS 4020.

Polyethylene tanks: to AS/NZS 4766

Refer to DG / WATER

3
Execution
Mandatory
Mandatory

As per current NATSPEC except as follows:

3.3 Sheet Metal Roofing
 

Roof sheet installation
Installation

  • To HB 39 Code of Common Practice for Steel Roofing
  • ASTM D200 Classification System for Rubber Products in Automotive Products
  • Manufacturers Roofing and Walling Installation Manual/s

Workmanship: Care, storage, handling, cutting and installation all in accordance with the relevant Australian Standards and the roof manufacturers printed technical data sheets.

Completion: On completion of roof installation obtain certification from the roof manufacturer stating that the material and installation is in accordance with the printed technical data sheets provided by the manufacturer and the specification.  Hand the certification to the Principal’s Authorised Person / Principal’s Representative
 

3.5 Roof Plumbing
 

General
Pipework: All rainwater collection pipework to be suitable for use with potable water in compliance with AS 3855 (INT) and testing to AS/NZS 4020

GUIDE NOTE:  Extra super heavy bituminous coated aluminium flashing (Min. 0.70mm Alum. thickness) to be used for roof flashing. 
 

Flashing and cappings schedule

Component

Material and Finish

Thickness and Grade

Profile and Size

Jointing method

Flashings



 

*Extra Super heavy, bituminous coated aluminium

* 0.70 mm (aluminium thickness) to AS 2904

 N/A

N/A

Gutters

GUIDE NOTES: Gutter brackets to be installed as per manufacturers recommendation. Additional supports to be provided in areas considered to be high risk , which are prone to interference due to low gutter height in traffic areas.

Gutter brackets for half round gutters: 50 x 5mm MS fabricated to match gutter.  Hot dipped galvanised and pre-coated.

  • Hot dipped galvanising: To BS 6497
  • Epoxy primer: 250 microns
  • Polyester powder: 80 microns to AS/NZS 4506

Internal fitting gutter brackets must not be used.

Leaf guards to gutters:

GUIDE NOTE: Leaf guards to be site specific, considering existing and proposed trees. 
 

Alternative may be "leafless" gutters, subject to cost benefit and availability.

Leaf guards to gutters - Water tank installation: Provide leaf debris diversion and exclusion systems.

  • Must be fire proof (zero ignitability index), non-rusting and approved for potable water.

Downpipes

GUIDE NOTE: Downpipes to be min. 75mm Dia. or 75mm deep for rectangular sections. 
 

Acceptable materials are stainless steel, galvanised waterpipe, cast iron, UPVC, aluminium, zincalume steel and copper. 

For light gauge metals, protection is required below 2100mm. with a guard of min. 1.6mm materal, fixed independently. DOwnpipes to be fixed hard against wall, column, etc. Astragals of similar material generally to be at 1800 crs, fixed to downpipe as well as support. 

If possible locate downpipes away from main circulation, driveways etc. 

Downpipes are not to be recessed into brickwork or fully enclosed. 

They should not connect directly into stormwater pipes but above a collar with a grate. 

3.8 Skylights
 

Roof material
Installation: To AS/NZS 1562.3 in conjunction with the manufacturers printed instructions and as shown on drawings.

Clear sheeting under translucent roofing
Installation

  • Continually supported under the corrugated roof sheeting for the whole length.
  • In accordance with manufacturer's instructions
  • As shown on drawings.

​Diffuser panel

GUIDE NOTE: The extruded aluminium h channel described below is based on “Capral aluminium’s – Alcan extrusion El5328”.  Other proprietary extrusions that comply with the specification requirements described Below may also be acceptable.


Installation: Install an extruded aluminium “h” channel to hold the diffuser panel in position. The “h” channel is to be ribbed internally to help grip the diffuser. Spot fix diffuser panel in channel with clear silicone at intervals of 400mm (minimum).

3.11 Roof Ventilators
 

Rotary roof ventilators
Installation

  • In accordance with manufacturers printed instructions. Fix ventilator base to fixing battens and securely strap fixing battens to roof members.

Roof smoke ventilators
Installation

  • All in accordance with manufacturers printed instructions.  Fix ventilator base to fixing battens.
  • Flashing: All in accordance with manufacturers printed instructions.
  • Controls: Manual operation controlled by two positions on both sides of the stage.
  • Height From Floor: 1500 mm from finished floor level to centre of remote manual controlled mechanism.
  • Signs: Install signs describing the operation of the vent system, at each of the manual or automatic operating positions.
3.15 Safety Mesh
 

Location
All roofs

Requirement
Permanently fix safety mesh to all roofs.

Safety mesh must be permanently fixed over the entire area to be roofed (includes eaves).

Safety mesh must remain in place after completion of building.

Standards
General: To AS/NZS 4389

Code of Practice: Must be in accordance with WorkCover’s – Code of practice for Safe Work of Roofs – Part 1 Commercial and Industrial buildings Cl. 3.2 Safety mesh

  • Other available methods as an alternative to safety mesh must not used.
4
Selections
Mandatory
Mandatory

As per current NATSPEC.

Performance Criteria

Roofing system selections should be based on the following performance criteria:

  • Offer value for money in a Whole of Life framework;
  • Be readily available commercial proprietary systems
  • Have appropriate aesthetic appeal and preferably be pre-finished in standard off-the-shelf colours.  Glare to adjoining buildings to be minimised.
  • Offer long life span with high durability
  • Have low maintenance requirements and costs
  • Remain intact and waterproof under the local climatic conditions.
  • Provide adequate means of dealing with vapour pressure, condensation, corrosion and thermal movement.
  • Support the imposed loads and types of roof access without impairment of performance;
  • Provide appropriate corrosion resistance for:
  • Atmospheric exposure conditions
  • Service conditions due to the nature of nearby activities taking place in the installation
  • Contact with other materials or contact with water washing off other materials
  • Support sustainability by having recycling potential at the end of usable life, and/or include recycled content.