Stramit CapacityPLUS Deep Roof Cladding

Features/Benefits

• 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 810mm cover – fewer sheets 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 1^o 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. 

Applications

 The drainage capacity, strength, wide cover, light weight and weather resistance of Stramit CapacityPLUS™ 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™cladding is only intended for use in commercial/industrial roof and wall cladding applications. Do not use for any other purpose.

Materials

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

Coated steel product is manufactured from high yield strength G550 colour coated steel 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. 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.

STRAMIT CapacityPLUS™ CLADDING - SHEETING MASS (kg/m2 of roof area)   Zincalume® Colorbond® Aluminium 0.42mm steel BMT 4.64 4.72 - 0.48mm steel BMT 5.27 5.35 - 0.7mm aluminium - - 2.54 0.9mm aluminium - - 3.26

Adverse Conditions

Stramit CapacityPLUS™ cladding will give excellent durability in almost all locations. It is however important to choose the correct coating for each application environment. 
The table below shows the suitability of coating types for different exposure conditions. 

suitability of coating type site exposure condition begin moderate severe very severe Zincalume® AZ150 ? ? Colorbond® ? Colorbond® Ultra N/A N/A ?

? Question marks indicate conditions where durability may be diminished, depending on the particular application. 

The approximate site exposure conditions in the table above are defined below. 

site exposure condition	distance of site from
	rough active surf	calm, still salt water	industrial emission	fossil fuel combustion
benign	1000m +	100m +	500m +	500m +
moderate	400m-1000m	0-100m	250m-500m	250m-500m
severe	100m-400m	N/A	100m-250m	100m-250m
very severe	0-100m	N/A	0-100m	0-100m

Note - The suitability and exposure tables above are guidelines only; conditions will vary from site to site. If in any doubt about the choice of coating for a particular application consult your nearest Stramit office for advice. 

Compatibility 

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^® and galvanised roofs avoid copper, lead, green or treated timber, stainless 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, COLORBOND^® and ZINCALUME^®. Contact Stramit for more detailed information.

Testing

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™ cladding in continuous lengths with trapezoidal ribs approximately 50mm high, spaced at 270mm 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 AZ150 zincaluminium coating with or without an oven-baked paint film of selected colour.
  or
• 0.7mm or 0.9mm cold-rolled aluminium sheet of alloy 3004 H34, 5152 H39 or 5052 H38, in accordance with AS2848 and AS1734 or profile manufacturer approved equivalent.

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 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 weathertight. Repair minor blemishes with touch-up paint supplied by the roof manufacturer. All debris (nuts, screws, cuttings, filings etc.) shall be cleaned off daily.

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.

STRAMIT MEGACLAD® CLADDING – MAXIMUM SPAN CHART (mm) material bmt (mm) roofs walls overhangs Pressure (kPa)   internal (end) span combination Pressure (kPa)   internal (end) span combination   service -ability strength double spans equal spans service -ability strength double spans equal spans free edge stiffened edge N1 or Region A (sheltered suburban) G550 steel 0.42 0.76 1.35 1650 1650 1800(1500) 0.61 1.04 1950 1950 2250(1850) 150 400 G550 steel 0.48 0.76 1.35 1750 1750 2100(1750) 0.61 1.04 2350 2350 2900(2400) 200 500 G550 steel 0.42+b/w 0.76 1.35 2500 2500 2800(2300) 0.61 1.04 3000 3000 3000(2500) 150 400 G550 steel 0.48+b/w 0.76 1.35 3000 3000 3000(2500) 0.61 1.04 3000 3000 3000(2500) 200 500 aluminium 0.7+a/caps 0.76 1.35 1800 1800 1800(1500) 0.61 1.04 2700 2700 3000(2500) 100 350 aluminium 0.9+a/caps 0.76 1.35 1800 1800 1800(1500) 0.61 1.04 3000 3000 3000(2500) 150 450 N2 or Region B (sheltered suburban) and Region A (exposed suburban) G5500 steel 0.42 0.78 1.94 1350 1350 1400(1150) 0.61 1.49 1550 1550 1700(1400) 150 400 G5500 steel 0.48 0.78 1.94 1400 1400 1650(1350) 0.61 1.49 1650 1650 1950(1600) 200 500 G5500 steel 0.42+b/w 0.78 1.94 2500 2500 2750(2250) 0.61 1.49 3000 3000 3000(2500) 150 400 G5500 steel 0.48+b/w 0.78 1.94 2600 2600 3000(2500) 0.61 1.49 3000 3000 3000(2500) 200 500 aluminium 0.7+a/caps 0.78 1.94 1800 1800 1800(1500) 0.61 1.49 2700 2700 3000(2500) 100 350 aluminium 0.9+a/caps 0.78 1.94 1800 1800 1800(1500) 0.61 1.49 3000 3000 3000(2500) 150 450 N3 or Region A (rural) and Region B (exposed suburban) G550 steel 0.42 1.18 2.96 1000 1000 1000(800) 0.92 2.25 1200 1200 1250(1000) 100 300 G550 steel 0.42 1.18 2.96 1050 1050 1250(1000) 0.92 2.25 1250 1250 1500(1250) 150 400 G550 steel 0.42+b/w 1.18 2.96 1450 1450 1750(1450) 0.92 2.25 2050 2050 2400(2000) 100 300 G550 steel 0.48+b/w 1.18 2.96 1650 1650 1950(1600) 0.92 2.25 2150 2150 2600(2150) 150 400 aluminium 0.7+a/caps 1.18 2.96 1700 1700 1800(1500) 0.92 2.25 2200 2200 2650(2200) 50 250 aluminium 0.9+a/caps 1.18 2.96 1800 1800 1800(1500) 0.92 2.25 2600 2600 3000(2500) 100 350 NOTE: Pressures are largest computed from AS1170.2:1989 and AS4055:1992. Assumed height of building 7.0m, topography multiplier 1. b/w = 25mm diameter bonded washers, a/caps = pre-formed aluminium caps

Pressures

STRAMIT® CapacityPLUS ™ CLADDING - SERVICEABILITY LIMIT STATE CAPACITY       material thickness bmt (mm) fasteners per sheet span type pressure (kPa) at the spans (mm) shown 600 900 1200 1500 1800 2100 2400 2700 3000           G550 steel 0.42 3 internal 1.68 1.68 1.41 1.20 1.03 0.88 0.76 0.65 0.55 equal 1.98 1.98 1.62 1.32 1.07 0.88 0.72 0.60 0.51 double 1.98 1.98 1.62 1.32 1.07 0.88 0.72 0.60 0.51   G550 steel 0.48 3 internal 2.93 2.93 2.32 1.86 1.51 1.26 1.08 0.95 0.84 equal 2.55 2.55 1.94 1.51 1.22 1.02 0.88 0.77 0.63 double 255 2.55 1.94 1.51 1.22 1.02 0.88 0.77 0.63   G550 steel 0.42 3 + bonded washers internal 1.71 1.71 1.71 1.48 1.27 1.09 0.94 0.80 0.68 equal 1.87 1.87 1.87 1.80 1.47 1.14 0.86 0.69 0.67 double 1.87 1.87 1.87 1.80 1.47 1.14 0.86 0.69 0.67   G550 steel 0.48 3 + bonded washers internal 2.76 2.76 2.76 2.62 2.24 1.87 1.53 1.23 1.00 equal 2.59 2.59 2.59 2.24 1.80 1.40 1.09 0.87 0.80 double 2.59 2.59 2.59 2.24 1.80 1.40 1.09 0.87 0.80   aluminium 0.7 3 + aluminium caps internal 2.18 2.18 2.06 1.78 1.51 1.29 1.08 0.90 0.74 equal 2.18 2.18 1.83 1.51 1.24 1.00 0.79 0.63 0.50 double 2.18 2.18 1.83 1.51 1.24 1.00 0.79 0.63 0.50   aluminium 0.9 3 + aluminium caps internal 3.90 3.90 3.55 2.74 2.13 1.72 1.43 1.21 1.04 equal 3.90 3.90 2.86 2.13 1.64 1.32 1.10 0.91 0.67 double 3.90 3.90 2.86 2.13 1.64 1.32 1.10 0.91 0.67

STRAMIT® CapacityPLUS ™ CLADDING - STRENGTH LIMIT STATE CAPACITY       material thickness bmt (mm) fasteners per sheet span type pressure (kPa) at the spans (mm) shown     600 900 1200 1500 1800 2100 2400 2700 3000           G550 steel 0.42 3 internal 3.33 3.33 2.45 1.82 1.39 1.13 0.98 0.91 0.89     equal 3.48 3.48 2.35 1.60 1.16 0.95 0.87 0.85 0.80     double 3.48 3.48 2.35 1.60 1.16 0.95 0.87 0.85 0.80       G550 steel 0.48 3 internal 4.34 4.34 3.18 2.33 1.74 1.36 1.15 1.06 1.03     equal 3.60 3.60 2.47 1.74 1.31 1.10 1.03 1.02 0.97     double 3.60 3.60 2.47 1.74 1.31 1.10 1.03 1.02 0.97       G550 steel 0.42 3 + bonded washers internal 5.19 5.19 4.20 3.45 2.91 2.54 2.29 2.11 1.98     equal 4.56 4.56 3.58 2.91 2.48 2.21 2.03 1.87 1.66     double 4.56 4.56 3.58 2.91 2.48 2.21 2.03 1.87 1.66       G550 steel 0.48 3 + bonded washers internal 6.74 6.74 5.23 4.10 3.29 2.75 2.39 2.18 2.02     equal 5.78 5.78 4.30 3.29 2.66 2.29 2.08 1.91 1.68     double 5.78 5.78 4.30 3.29 2.66 2.29 2.08 1.91 1.68       aluminium 0.7 3 + aluminium caps internal 4.22 4.22 4.05 3.64 3.26 2.92 2.61 2.34 2.09     equal 4.22 4.22 3.72 3.26 2.85 2.49 2.18 1.92 1.71     double 4.22 4.22 3.72 3.26 2.85 2.49 2.18 1.92 1.71       aluminium 0.9 3 + aluminium caps internal 5.93 5.93 5.49 4.47 3.71 3.20 2.84 2.58 2.36     equal 5.93 5.93 4.62 3.71 3.10 2.71 2.44 2.21 1.93     double 5.93 5.93 4.62 3.71 3.10 2.71 2.44 2.21 1.93

Tables are based on tests to AS1562 and AS4040 parts 0 and 1. Internal spans must have both end spans 20% shorter. Values only valid for use with steel support members of 1.5mm or thicker.

Cyclonic Area Spans

Stramit CapacityPLUS™ cladding can be used in cyclonic areas but the strength data will be affected.

STRAMIT CapacityPLUS™ CLADDING – CYCLONIC DESIGN SPANS (for pressure 3.71kPa) material thickness bmt (mm) fasteners per sheet at each support support spacing (mm) G550 steel 0.42 3 + cyclone assembly 1200 G550 steel 0.48 3 + cyclone assembly 1500 aluminium 0.7 3 + aluminium caps 1200 aluminium 0.9 3 + aluminium caps 1500

Tables are based on testing to AS1562 and AS4040 parts 0, 2 and 3. Values only valid for use with steel support members of 1.5mm or thicker. Spans shown may be end, double or continuous. Cladding can be used in cyclonic areas but the strength data will be affected.

Foot Traffic

< Foot traffic limits for Stramit CapacityPLUS™ cladding are shown for three alternate foot traffic categories. These are:

• High Maintenance – for applications with repeated maintenance, particularly where personnel may be unfamiliar with correct procedures for walking on metal roofs.
• Normal – based on traditional expectations, with moderate maintenance foot traffic using designated foot paths.
• Controlled – spans that conform to AS1562 but require minimal careful foot traffic only on the designated foot path. Suggested for use only where occasional aesthetic imperfections from foot traffic are acceptable.

STRAMIT CapacityPLUS™ CLADDING - FOOT TRAFFIC LIMITED SPANS (mm) material thickness bmt span type foot traffic limits heavy normal controlled G550 steel 0.42 internal 1200 3000 3000 equal 900 3000 3000 double 900 3000 3000 G550 steel 0.48 internal 1500 3000 3000 equal 1200 3000 3000 double 1200 3000 3000 aluminium 0.7 internal - 1800 1800 equal - 1800 1800 double - 1800 1800 aluminium 0.9 internal - 1800 1800 equal - 1800 1800 double - 1800 1800 Tables are based on tests to AS1562 and AS4040 parts 0 and 1.

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

Spring Curving

Stramit CapacityPLUS™ 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™ 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.

STRAMIT CapacityPLUS™ CLADDING - THERMAL EXPANSION TABLE MAXIMUM SHEET LENGTH (m)
material	roof colour	light steel	dark steel	light steel
G550 steel	Flat	25	17	15
G550 steel	Spring-curved	20	17	15
The maximum length of sheeting can be extended by 10m through the use of special caps with slotted ribs.

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.

STRAMIT CapacityPLUS™ CLADDING - MINIMUM ROOF SLOPE (degrees)   NORMAL DRAINAGE CRITERIA max roof run length (m) at min slope rainfall intensity mm/hr total roof run length (m) 100 120 140 160 180 200 150   235 175   1.0 202 200   Min Slope 1° 1.2 1.6 176 225   1.2 1.7 2.4 157 250   1.0 1.6 2.4 3.0 141 275   1.4 2.2 3.0 3.8 128 300   1.2 1.9 2.8 3.6 4.8 117 325   1.5 2.4 3.4 4.4 6.0 108 350 1.0 1.9 2.8 4.0 5.5 7.0 101 375 1.3 2.4 3.4 4.8 6.5 8.0 94 400 1.6 2.8 4.0 5.5 7.0 9.0 88 Note: Depth of flow in pan 60% height of underlap (agreed industry standard) for ‘Normal drainage criteria’

For more information on water carrying performance 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.                          

Fasteners

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:

	- 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

	- No. 12 x 95mm* type 17 screws for crest fixing
	- No.10 x 25mm type 17 screws for pan fixing to walls

	- 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.>

Insulation

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

Installation

Stramit CapacityPLUS™ 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™ 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.

Walking 

As with all roofing products, we recommend extra caution be taken when walking on the roof. When walking on Stramit CapacityPLUS™ 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.

Cutting

Stramit CapacityPLUS™  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

Prices on Stramit CapacityPLUS™ 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
	Flashings – 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

Length

Stramit CapacityPLUS™ 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.

Ordering

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

Delivery/Unloading 

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™ cladding, care should be taken to ensure that the load is spread to prevent damage.

Handling/Storage

Stramit CapacityPLUS™  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.

Maintenance

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 www.stramit.com.au

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  

References

  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