Roofing - Profiled Sheet Metal

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.

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.

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) 

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

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

• 2400 g/m2
• 3050 g/m2
• 3660 g/m2

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%.

• Identification: Coloured thread embedded along the entire side rib of each sheet to identify that it complies with the required fire hazard indices.

• 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.

Diffuser 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.

•  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

Performance classification
Rain resistance: Class A to AS4740

Corrosive locations

•  Turbine and Base:  Aluminium grade:  5005 H34
•  Finish: Powder coated.

Damper
Location: Inside throat

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.

Register /ceiling grille
Refer to SG / LINING

Refer to SG / SUSPENDED CEILINGS

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

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

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

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.

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.

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