Cookdek Technical Details

Cooldek Classic Profile

Walling Cooldek Profile

Cooldek CGI Profile

Cladding Roofing Sheeting
cladding roofing sheeting walling cooldek

Design Considerations

The minimum recommended roof pitch for ‘flat’ verandahs shall be 1° (1 in 60) for Cooldek Classic panels and 3° (1 in 20) for Cooldek CGI panels. The maximum roof pitch for ‘flat’ verandahs shall be 5° (1 in 12). Care must be taken to ensure the minimum roof pitch is maintained to avoid ponding of rainwater.

The roof is designed to withstand maintenance activitie, roofs are not to be used for floor type activities.

The design contained within these span tables relate to wind classifications N1, N2, N3, and N4 applicable to Regions A and B. Stratco does not accept liability for any loss or damage suffered as a result of any errors in the interpretation or application of these span tables.

Material PropertiesCooldek ClassicCooldek CGI
Base Metal Thickness / Material GradeTop Skin0.42mm / G5500.42mm / G550
Bottom Skin0.50mm / G3000.50mm / G300
Mass (kg / linear metre)50mm Panel9.59.6
75mm Panel9.89.9
100mm Panel10.110.2
Width Coverage (mm)10001000
Minimum Roof Pitch
CoreMaterialSL Grade EPS (expanded polystyrene)
Thermal Conductivity0.037 W/mK (0°C mean temperature)


The Wind Capacity Tables are based on testing in accordance with AS1562.1-1992 and AS4040.0, 1 & 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.


The spans given in the ‘Single Spans’ table are determined for wind speeds for non-cyclonic areas. Indicated spans are suitable for ‘flat’ roof patios. Open freestanding unit spans can be taken from open three sides unless a wall, eaves or boundary exists within 500mm of two or more sides.

For Cooldek roofing in attached or freestanding domestic gable patio application, sheet spans shall not exceed those given for one or no open sides. Alternatively the ‘Wind Capacities’ table may be used to determine allowable single spans for any application.

Spans specified for units with three sides open are suitable for units considered ’empty under’ and not exceeding three metres in height (from ground or deck level). For units in which goods or materials stored under the roof are expected to block greater than 50% of any open side exposed to the wind, take the spans from open two sides.

For units with two open sides, spans are based on Cp,n=-1.0 while for units with only one or no open sides, Cp,n=-1.2. In all cases, relevant consideration has been given to local pressure.

roofing sheeting walling cooldek spans

Note: The ‘Wind Capacities’ table provides allowable wind capacities for Cooldek in single span application for serviceability and strength limit states. The pressures given may be used by a suitably qualified engineer for any single span application ensuring appropriate fixing details are applied.

Domestic Patio Single Spans

Cooldek Classic
Open SidesPanel Thickness (mm)N1 (W28)N2 (W33)N3 (W41)N4 (W50)
Three505400540054004200 (3900)
756600660060004800 (3900)
Two505400540039003300 (3000)
756600550048003900 (3000)
1007200630054004100 (3500)
One/None or Gable Patio505400450033003000 (2000)
756000480039003300 (2100)
1006900540042003600 (2400)

Cooldek CGI
Open SidesPanel Thickness (mm)N1 (W28)N2 (W33)N3 (W41)N4 (W50)
756600660060004800 (3900)
756600570048003900 (3000)
1007200660054004100 (3500)
One/None or Gable Patio505400450033003000 (2000)
756300510039003300 (2100)
1007200570042003600 (2400)

Maximum allowable 900mm deck overhang for 50 and 75mm panels and 1200mm for 100mm panels, except in wind classification N4 in which maximum allowable shall be 900mm. The cladding back span shall be no less than 1.5 times the deck overhang. If values are shown in brackets they represent the maximum allowable span if an overhang is used. For a side to be considered open, the full length of the side must be open.


Single Span Wind Capacities

Single Span Wind Capacities (kPa)     
ProfilePanel Thickness (mm)Limit StateSpan (mm)

The values in all the above tables are for use with steel supports with a minimum thickness of 1.0mm BMT, G550, or timber supports with fixing details as specified under ‘Installation’.