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1.1 General
All roof cladding design drawings as well as zinc layout and joint detail drawings should be reviewed by zinc manufacturer prior to start of installation.
2. Materials
2.1 Rheinzink Titanium Zinc pre weathered Pro type (pickling process). Alloy is electrolytic high-grade zinc (DIN 1706) with a 99.995% Zn degree of purity and alloying additives of 1% Copper and 1% Titanium. Phosphate coatings are not acceptable.
Minimum thickness roof cladding 0.70 mm
Minimum thickness wall cladding 0.80 mm
2.2 Finish
Zinc finish shall be Rheinzink pre weathered Plus for all visible areas.
2.3 Accessories
Solder
Lead / tin soft solder containing 40% tin and 60% lead.
2.3.2 Flux
Z-04-S flux is recommended.
2.3.3 Sealant
100% pure silicone rubber with neutral cure, non-acid based.
Colour: dark grey or translucent.
2.4 Membrane
Grace underlay Bituthene 3000.
2.5 Underlay
Enkamat 7210 spacermat (polyamide separation layer).
2.6 Fixings
2.6.1 Nails
Hot dipped galvanised steel self-tapping screws with large flat head 2.5x19mm to install underflashings & starter strips.
2.3.2 Screws
SS counter sunk, undercut screws. A gauge, 20 mm to install fixing clips.
.6.3 Fixing clips
SS-fixed type and sliding type fixing clips.
2.7 Substructure-Plywood
2.7.1 Substructure
Roof: Structural plywood D/D grade min. 19mm, A bond.
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Purlin spacing: 600 or 800 mm
Wall: Structural plywood D/D grade min. 17 mm, A bond.
2.7.2 Substructure-Secondary Steel (to fix plywood sheets)
Wall: Square Hollow Section (mild steel) to curved areas, 35mm spaced at 600mm
Wall: Top Hat Section galvanised to straight areas, 35mm spaced at 600mm
2.7.3 Safety Mesh
To comply with Australian safety requirements.
2.8 Insulation
With vapour barrier, the vapour barrier has to be installed to warm side of application, check with Engineer on climate zone requirements.
3.1 Temperature
A minimum temperature of 10° Celsius has to be maintained while forming the zinc alloy.
3.2 Forming
The trays should be manufactured from pre levelled blanks with a roll forming machine.
Additional formwork, like rounding, bending and folding can easily be carried out with conventional tools and equipment. The minimum bending radius is 1.75 mm. Sharp instruments for marking and bending should be avoided.
4.1
Zinc coils and sheets should only be delivered to site when work is ready to start.
4.2
Ensure that no water penetrates the coils or stacked sheets during transport and storage.
Store material in a dry, ventilated room.
Should white dust appear on the surface of the material remove it immediately with a brush and water and let dry.
5.1 Installer
The installer must be approved by supplier of the materials before any work is commenced and must be specifically trained and experienced in the application of zinc to have a material warranty issued. |
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The Subcontractor should provide documented proof of successfully installed non-ferrous metal installations of similar project size.
Please contact Craft Metals for approved installers. Phone 02 94824166, 03 9850 8029
5.2
The sequence of installation is from the bottom to the top.
5.3
Dimensions of roof trays: Max. length: 17,000mm
Rec. width: 670 mm girth (600 mm between seams)
Parapet: Max. length: 4000mm
Wall: Max. length: 6000mm
Max. width: 570mm girth (500mm between seams)
Panels, trays, copings and flashings shall be fixed in a manner to allow for thermal expansion and contraction of the metal.
Ventilation gap min. 35 mm, with adequate bottom air inlet and ridge air outlet slots with flashings to avoid water intake.
Use double standing seam technique for roof claddings and angle seam-, or a roll cap technique for wall claddings.
All joints - including expansion joints - within the zinc roof system and with materials adjacent to the zinc shall be rain proof.
Joints at penetrations and flashings should be made water tight by means of soldering, welting or double welting.
The minimum required overlap depends on the wall pitch: refer to zinc manufacturers recommendations.
Fasten every fixing clip with tow SS screws.
Use sliding clips if the trays are longer than 2000 mm.
The distance between fixing clips should not exceed 330 mm.
Refer to zinc manufacturers recommendations regarding the position of sliding/fixed clips and amount of clips required.
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