Stramit CapacityPLUS 660 Deep Roof Cladding



  • High 50mm ribs – excellent water-carrying capacity at low roof pitch and superior profile rigidity.
  • Simple rib shape – enables reliable screw fixing, and easy to trim and notch flashings.
  • Wide 660mm cover – enabling fast handling and laying, and cost economy.
  • Screw fixed – allows fast and flexible high-wind installation techniques such as ‘tack and screw-off’.
  • Range of materials – choice of materials and finishes for enhanced durability options.
  • Low 1o pitch – building economies due to low wall heights and structure reduction.
  • Fully tested – in-house and independent testing for reliable design data and peace-of-mind.
  • Nesting profile – flat packs for economical transport and site crane handling.


The drainage capacity, strength, wide cover, light weight and weather resistance of Stramit CapacityPLUS™660 cladding make it perfect for large commercial roofing and walling applications. Its excellent strength and ease of assembly allow for long, economical spans. The large water-carrying capacity and weather-tightness permit very low roof pitches, leading to economies in the building structure.

Stramit CapacityPLUS™660 cladding is only intended for use in commercial/industrial roof and wall cladding applications. Do not use for any other purpose.


Stramit CapacityPLUS™660 cladding can be supplied in coated and coloured high strength steel or stainless steel.

Coated steel product is manufactured from high yield strength G550 colour coated steel, aluminium-zinc-magnesium or zinc-aluminium alloy coated steel. In some locations galvanised and severe environment colour coated steel may be available by arrangement. Colour coated steels are in accordance with AS2728 – Category 3 and, for the substrate, with AS1397. Aluminium-zinc-magnesium alloy coated AM100/AM125 or ZM275, zinc aluminium-alloy coated AZ150 and galvanised Z450 conform to AS1397.

Stramit has a comprehensive range of colours as standard. Ask at your nearest Stramit location for colour availability.


Adverse Conditions

Stramit CapacityPLUS™660 roof and wall cladding will give excellent durability in almost all locations. It is however important to choose the correct coating for each application environment as shown in the table below. Durability recommendations do vary based on the application of the product, in roofing or walling installations. Please read the tables below carefully.



All building products need to be checked for compatibility with adjacent materials, whether they be part of the current project or pre-existing or planned building elements. These checks need to be for both direct contact between materials, and where water runs from one material to another. The following guidelines generally avoid material incompatibility:

• For zincalume®, colorbond®, MagnaFlow® and galvanised roofs avoid copper, lead, green or treated timber, stainless steel, uncoated steel and mortar or concrete.

• In addition galvanised roofs should not receive drainage from aluminium, copper or any inert materials, such as plastics, glass, glazed tiles, MagnaFlow®, colorbond® and zincalume®. Contact Stramit for more detailed information.


Stramit has in-house, purpose built, testing equipment used to design, develop and improve products for the Australian market. In addition many Stramit® products are tested or witnessed by independent organisations.These include:

• Cyclone Testing Station (James Cook University)

• The University of Sydney

• University of Queensland

• University of Technology, Sydney


This ongoing research and development activity ensures that Stramit remains at the forefront of innovation, design and consumer information.

Architectural Specification

This specification may be used to ensure that required performance and functional needs are met:-

The roofing/walling shall be Stramit CapacityPLUS™660 cladding in continuous lengths with trapezoidal ribs approximately 50mm high, spaced at 220mm centres.

Sheeting material shall be

• 0.42mm or 0.48mm bmt G550 protected steel sheet to Australian Standard AS1397, with a minimum yield stress of 550MPa (Grade G550) and an AM100/AZ150 or ZM275 coating with an oven-baked paint film of selected colour, or a plain AM125/AZ150 coating.

The sheeting shall be fixed to the purlins/girts in accordance with the manufacturer’s recommendations. Suitable fixing screws in accordance with Australian Standards AS3566, Class 3*, shall be used at every rib at every support with side lap fasteners installed at mid span if required. A minimum length of 50mm shall be provided for projection into gutters. Flashings shall be supplied in compatible materials as specified; minimum cover of flashing shall be 150mm. All sheeting shall be fixed in a workman-like manner, leaving the job clean and weather-tight. Repair minor blemishes with touch-up paint supplied by the roof manufacturer. All debris (nuts, screws, cuttings, filings etc.) shall be cleaned off daily.

*Class 4 fasteners should be used <1km from the coast.



Spans The spans shown below take account of ‘normal’ foot traffic and wind resistance including local pressure zone effects. Pressures are based on AS1170.2 section 2. Data should only be used for buildings 7m or less in height, 1000m2 or less in area and unaffected by land topography.


Foot Traffic

For more information on foot traffic performance of other Stramit®roofing profiles refer to Stramit’s Foot Traffic Guide.

Spring Curving

Stramit CapacityPLUS™ 660 cladding may be gently spring curved, concave and convex, including curved ridges, provided it is sealed at the apex and within recommended limits. These limits are yet to be determined. For more information on spring curving Stramit CapacityPLUS™ 660 contact your nearest Stramit office.

Thermal Expansion

All metal roof sheeting is subject to thermal expansion and, where there is a temperature difference between the sheeting and the structure, this needs to be accommodated. The colour of the sheeting will affect the amount of thermal expansion, and whether the sheet is flat or curved will affect its ability to resist without problems. Sheet lengths should be limited to those shown below.


Water Carrying

Stramit CapacityPLUS™ cladding has excellent water carrying capacity enabling roof slopes to be as low as 1º for many applications. Roof run lengths are the combined lengths of all roof elements contributing to a single pan drainage path. This can include the roof length upstream of a roof penetration that concentrates flow into other pans. The table below gives slopes for 100-year return period rainfall intensity.

Values are given for normal roof drainage applications, where the minimum slopes are calculated as for other Stramit® roofing profiles.

For more information on water carrying performance of CapacityPLUS™660 cladding and other Stramit roofing profiles refer to Stramit’s Roof Slope Guide.


Site Induction

Consideration should be given to roof and wall handling and installation issues as part of site induction safety procedures. Specific consideration should be given to pack handling, avoidance of cuts, trips, slips and falls, long sheet handling particularly in windy conditions, sheet cutting procedures and surface temperature on sunny days.                          


All fastening screws must conform to AS3566 – Class 3 or better. They are to be hexagon headed and, for roofs, must be used with sealing washers. For connecting to purlins or top hats in non-cyclonic regions use:

For steel (0.75bmt or greater)
- No.12 x 80mm* self-drilling and threading screws for crest fixing
- No.10 x 16mm self-drilling and threading screws for pan fixing to walls
For timber (F11 or better)
- No. 12 x 95mm* type 17 screws for crest fixing
- No.10 x 25mm type 17 screws for pan fixing to walls
Side Laps
- No. 8 x 12mm ‘S’ point screws, or
- 3.2mm diameter sealed aluminium pop rivets

Note: *Lengths shown are suitable for use with insulation blanket up to 50mm. For 75mm or 100mm insulation blanket increase screw length by at least 10mm. In cyclonic areas crest-fixed roofing screws are generally No.14’s and used with cyclone washers.These should be assumed to be a requirement unless the application has clearly been designed and specified otherwise.>


Stramit CapacityPLUS™ 660 cladding is suitable as specified for use with insulating blanket up to 50mm. Increased thicknesses require longer fasteners and greater care in installation.


Stramit CapacityPLUS™ 660 cladding is readily installed with or without fibreglass insulation blanket. If practical lay sheets in the opposite direction to prevailing weather.

Installation of Stramit CapacityPLUS™ 660 cladding is a straightforward procedure using the following fixing sequence: 

1)  Ensure all purlins are in line and correctly installed and that mesh and blanket (if specified) are in place. 
2)  Position and fix the first sheet ensuring the correct sheet overhangs (minimum 50mm). Ensure that screws are not overtightened. 
3)  Continue to fix subsequent sheets checking that sheet ends at the lower edge are exactly aligned.  

It is important that the underlap of one sheet does not protrude beyond the overlap of the next at the low end of the run - if this is unavoidable, the underlap must be trimmed locally or water ‘drawback’ may occur.

4)  Measure the overall cover width at top and bottom of the sheets from time to time to avoid unwanted ‘fanning’. 
5)  For roof spans exceeding 1500mm and wall spans exceeding 1800mm, stitch the sidelaps at midspan. 
6)  Turn up the pans at the upper roof edge and turn down the pans at the lower edge and install flashings. 
7)  Clean up the roof after each days work, removing all screws, cuttings, swarf etc, and leave roof clean and watertight.


As with all roofing products, we recommend extra caution be taken when walking on the roof. When walking on Stramit CapacityPLUS™ 660 roofing always wear flat rubber soled shoes and place feet only in the pans, taking care to avoid the last pan or two near edges of the metal roof area. 

Walk only in pans, or on ribs at purlin supports 

Good Practice

Stramit recommends that good trade practice be followed when using this product, such as that found in Australian Standards Handbook HB39.


Stramit CapacityPLUS™ 660  cladding can be easily cut, where required, using a power saw with a steel cutting blade or a power nibbler and, for localised cutting, tin snips. Avoid the use of abrasive discs as these can cause burred edges and coating damage. Please dispose of any off-cuts carefully.




Prices on Stramit CapacityPLUS™ 660 cladding and its accessories can be obtained from your nearest Stramit® location or distributor of Stramit®products. As Stramit does not provide an installation service, ask your trades person for a supply and fix price. Contact your nearest Stramit location for the names of suitable trades persons in your area.                        

Related Products

Ridge Capping
standard or custom dimensions
a range of custom flashings
Filler Strips
top and bottom; for eaves, ridge and joint sealing
Use only where sealing is preferred to ventilation
Insulation & roofing mesh
a range of mesh, sisalation, plain & foil backed blanket
Translucent sheeting
fibreglass sheeting in a range of shades and densities


Stramit CapacityPLUS™ 660 cladding is supplied cut-to-length. When designing or transporting long products ensure that the length is within the limit of the local Transport Authority regulations. The manufacturing tolerance on the length of product supplied is +0, -15mm.


Stramit CapacityPLUS™ 660 cladding can be ordered directly, through distributors, or supplied and fixed from a roofing contractor.


Delivery can normally be made within 48 hours, subject to the delivery location, quantity and material availability, or can be at a pre-arranged date and time. Please ensure that suitable arrangements have been made for truck unloading, as this is the responsibility of the receiver. Pack mass may be up to one tonne. When lifting Stramit CapacityPLUS™ 660 cladding, care should be taken to ensure that the load is spread to prevent damage.


Stramit CapacityPLUS™ 660  cladding should be handled with care at all times to preserve the product capabilities and quality of the finish. Packs should always be kept dry and stored above ground level while on site. If the sheets have become wet, they should be separated, wiped and placed in the open to promote drying.




Exterior surfaces of metal products unwashed by rain can benefit from occasional washing to remove build-up of corrosive salts. Walls beneath eaves or awnings are such a situation.

Further Information

As well as our standard range of Technical Manuals, Installation Leaflets, Case Studies and other promotional literature Stramit has a series of Guides to aid design. 
These include: 

  • Roof & Wall Flashing Guide
  • Roof Slope Guide  
  • Foot Traffic Guide  
  • Concealed Fixed Decking  
  • Bullnosing, Curving and Crimping  
  • Acoustic Panels  
  • Cyclonic Areas  
  • Spring Curving Guide

Copies of these guides or other literature can be obtained from any Stramit Building Products branch or downloaded from

Other Products

Stramit offers a wide range of building products, including: 

  • Purlins and girts
  • Formwork decking  
  • Roof and wall sheeting  
  • Lightweight structural sections  
  • Truss components  
  • Gutters and downpipes  
  • Fascias  
  • Custom flashings  
  • Insulating products  
  • Fasteners  


  In preparing this document reference has been made to: 

  • Standards Australia Handbook – HB39
    (Installation code for metal roof and wall cladding)
  • BlueScope Steel – Technical Bulletin TB-4
    (Maintenance of Colorbond prepainted steel roofing)
  • BlueScopeSteel – Technical Bulletin TB-1
    (Steel roofing and walling products – selection guide)


Product Availability 


Y - Yes     N - No     S - Subject to project size