Maximus 33 Roofing & Wall Cladding

Maximus 33

Material Specifications

Material Mass

Maximum Recommended Spans

Roofing: Spans are limited based on typical maintenance foot traffic.
Walling: Spans are based on N1 wind loading, refer to the Spans table for additional wind allocations.

Carport / Patio Spans

For carport and verandah applications, utilise crawl boards or ladders over roofing to avoid damage during installation and maintenance. Always ensure boards or ladders are stable and will not slide.

Spans According to Wind Speed

0.40mm and 0.42mm BMT Maximus walling values are applicable for use with steel supports of minimum 0.75mm thickness, G550.
0.45mm and 0.48mm BMT Maximus roofing values are applicable for use with steel supports of minimum 1.0mm thickness, G550.
Note: End and Internal spans are applicable for cladding spanning over three or more continuous spans.

Wind Capacities

Values shown for 0.4 and 0.42mm Maximus are applicable for walling applications and use with steel supports of minimum 0.75mm thickness (G550). 0.45mm and 0.48mm Maximus values are applicable for roofing applications and minimum 1.0mm supports (G550).
Note: In roofing applications, if fixing  0.48mm BMT Maximus to 0.55mm supports, 0.40mm BMT Maximus capacities must be used and if fixing to 0.75mm BMT supports, 0.42mm BMT Maximus capacities are applicable.
Note: End / Internal capacities are applicable for cladding spanning over three or more continuous spans.

Water Carrying Capacity

The peak rainfall intensities shown represent a 100 year average recurrence interval (ARI) for a five minute rainfall duration.
If roof penetrations exist, the actual roof run will typically be larger than the distance from ridge to eaves due to penetration/s interfering with the runoff. Contact Stratco if further advice is required.

Compliance

Wind Capacity Tables are based on testing in accordance with AS1562.1-1992 and AS4040.0, 1 and 2-1992. Span tables have been developed by determining wind pressures in accordance with AS4055-2006 for domestic applications. Capacity tables are in limit state format.

Spans

Spans are determined by wind speeds for non-cyclonic areas. For domestic applications, the pressures and spans are based on an eaves height not exceeding 6m, a roof pitch no greater than 35° and a total roof height of maximum 8.5m. For commercial and industrial applications, span tables are based on a maximum overall height of ten metres and a 500 year design return period.

Roofing calculations are based on Cpe=-0.9 and Cpi=0.2, walling is based on Cpe=-0.65 and Cpi=0.2. A local pressure factor, Kl=2.0 has been used for all roofing spans for both strength and serviceability limit states. Roof spans take into consideration loads incidental to maintenance.

All pressures have been determined assuming wind loading in any direction but which is not affected by topography. The following shielding factors, Ms, have been used for each of the terrain categories: Category 3 = 0.85, Category 2.5 = 0.95, and Category 2 = 1.

Domestic carport and verandah spans only apply to structures not enclosed by peripheral walls. Spans are based on Cpn=-0.9 and Kl=1.5 applied over the entire span, and are suitable for all span types. Loads on supporting purlins may limit these spans.Stratco can provide additional engineering advice if any design parameters vary from those above.

Testing Systems

Stratco have developed purpose built testing equipment for the testing of cladding systems sufficient to ensure the structural adequacy of the product it produces.

Wind Load Conversion

For domestic applications use the appropriate wind classification for the area. To read the span tables for commercial and industrial applications, select the region and category for the area, then convert it to a wind classification using the table below.

Fixing Recommendations

Maximus sheets should be laid into the prevailing wind and sit neatly on the preceding roof sheet with a side lap as shown in the fastener positions detail below. They should be fixed within the recommended support spacings. Avoid 'stretching' the width of the sheet when installing, as this could allow wind and rain to enter. Side lap fixing is recommended to maintain a weather proof seal and to secure the overlap especially when the roof is walked on occasionally. This is best done with either 8 x 12mm self drilling stitching screws or a 3.2mm blind rivet (rivets should be sealed to prevent water penetration). It is recommended side lap fasteners are secured at maximum 900mm centres for roofing and 1200mm centres for walling. On roofing, at the high end of the sheets, the valleys of each corrugation should be turned up at crest using a turn up tool.

Roof Laying Procedure

Maximus 33 Fastener Selection

If fixing over an insulation blanket the next screw length to that indicated may be required with minimum 25mm timber embedment to be maintained.

Maximus 33 Fastener Positions

Walling

0.42mm BMT - 3 Screws / Sheet / Support
Single, End and Internal Spans

0.42mm BMT - 4 Screws / Sheet / Support
Double Span Supports

Roofing

0.48mm BMT - 3 Screws / Sheet / Support
Single, End and Internal Spans

0.48mm BMT - 6 Screws / Sheet / Support
Double Span Supports

Note: End and internal spans are applicable for cladding spanning over three or more supports.

Walking On Maximus

Stratco recommend foot traffic is kept to purlins for safety and to avoid damage during maintenance. When walking on a roof, wear flat, rubber soled shoes and walk flat footed spreading your weight over as many corrugations as possible. For carport and verandah applications, use crawl boards to avoid damage during installation and maintenance.

Using Maximus

Stratco Maximus will have a long, useful life if used according to Stratco specifications. While roofing materials in outer urban and rural areas may have a life-span in excess of 30 years, this can reduce to only a few years in coastal and industrial environments.

Zinc/al and pre-painted steel should not be used in aggressive areas such as near swimming pools and spas. It is important that dirt, soil, compost, paving sand, or other materials which retain moisture are not placed against steel. Concrete should not be poured against zinc/al material. Check with Stratco before using in these areas.

Incompatible Metals

The best way of reducing corrosion is to keep incompatible metals apart. Zinc/al and pre-painted steel cannot be used with lead, copper and monel. Galvanised steel and pure zinc material can be used with zinc/al, but you must avoid water run-off from zinc/al onto galvanised material. Fixings such as rivets and self-drilling screws must be compatible with the material they are fixing.

Handling And Cutting Of Maximus

For safety, wear gloves when handling Maximus. Ensure your hands or gloves are clean, especially when handling zinc/al which can mark. Use a coloured pencil for marking steel, as lead or black pencils contain graphite which promotes rusting. Maximus is best cut using tin snips, but for larger cuts it may be necessary to use a power saw with a steel cutting blade or a power nibbler. Avoid using abrasive discs as they can cause burred edges and coating damage. Where possible cut sheets on the ground, and always clean off any swarf and metal filings progressively during the installation. Dispose of off-cuts carefully.

Insulation And Sealants

The use of blanket insulation is recommended in domestic roofing to assist in temperature, condensation and sound control. Maximus can be used with an insulating blanket up to 55mm thick. Increased thicknesses require longer fasteners and greater care when installing.

When choosing a silicone sealant, ensure it is suitable for roofing and guttering use and of a non-acetic, amine free, neutral cure type. Sealants that smell of ammonia, vinegar or lemons are not usually suitable.