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Stramit Building Products >
Commercial Roofing
COMMERCIAL ROOFING
Appraisals, Tests :
Speed Deck Ultra® |
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Speed Deck Ultra®
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Pressures
Serviceability Limit State Capacity
| Bmt (mm) |
fasteners per sheet per purlin |
span type |
pressure (kPa) at the spans (mm) shown |
| 600 |
900 |
1200 |
1500 |
1800 |
2100 |
2400 |
2700 |
3000 |
| 0.42 |
1 clip and 3 screws |
internal |
2.81 |
2.81 |
2.53 |
2.24 |
1.96 |
1.68 |
1.39 |
1.11 |
0.83 |
| equal |
2.86 |
2.86 |
2.47 |
2.08 |
1.68 |
1.29 |
0.90 |
0.51 |
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| double |
2.33 |
2.33 |
2.08 |
1.84 |
1.60 |
1.36 |
1.12 |
0.87 |
0.63 |
| 0.48 |
1 clip and 3 screws |
internal |
3.12 |
3.12 |
2.80 |
2.49 |
2.18 |
1.86 |
1.55 |
1.23 |
0.92 |
| equal |
3.17 |
3.17 |
2.74 |
2.30 |
1.87 |
1.44 |
1.00 |
0.57 |
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| double |
2.58 |
2.58 |
2.31 |
2.04 |
1.78 |
1.51 |
1.24 |
0.97 |
0.70 |
Strength Limit State Capacity (Cyclonic & Non-Cyclonic)
| Bmt (mm) |
fasteners per sheet per purlin |
span type |
pressure (kPa) at the spans (mm) shown |
| 600 |
900 |
1200 |
1500 |
1800 |
2100 |
2400 |
2700 |
3000 |
| 0.42 |
1 clip and 3 screws |
internal |
7.91 |
7.91 |
6.16 |
5.07 |
4.32 |
3.78 |
3.36 |
3.03 |
2.77 |
| equal |
7.86 |
7.86 |
5.82 |
4.62 |
3.82 |
3.25 |
2.83 |
2.50 |
2.24 |
| double |
8.00 |
8.00 |
5.71 |
4.40 |
3.55 |
2.97 |
2.54 |
2.21 |
1.95 |
| 0.48 |
1 clip and 3 screws |
internal |
8.55 |
8.55 |
6.65 |
5.47 |
4.67 |
4.08 |
3.63 |
3.27 |
2.99 |
| equal |
8.49 |
8.49 |
6.29 |
4.98 |
4.12 |
3.51 |
3.05 |
2.70 |
2.42 |
| double |
8.64 |
8.64 |
6.17 |
4.75 |
3.84 |
3.20 |
2.74 |
2.39 |
2.11 |
Tables are baased on testing to AS1562 and AS4040 parts 0, 2, and 3. Internal spans must have both end spans 20% shorter.
Values only valid for use with steel support members of 1.5mm or thicker.
Foot Traffic
Foot traffic limits for Stramit Speed Deck Ultra® decking 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 designed 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.
| bmt (mm) |
span type |
high maintenance |
normal |
controlled |
| 0.42 |
internal |
1100 |
2100 |
2700 |
| equal |
700 |
1700 |
2250 |
| double |
700 |
1700 |
2250 |
| 0.48 |
internal |
1400 |
2700 |
3600 |
| equal |
900 |
2300 |
2700 |
| double |
900 |
2300 |
2700 |
Tables are based on tests to AS1562 and AS4040 parts 0 and 1.
Designing for Snow
Concealed fixed decking such as Stramit Speed Deck Ultra® decking is the preferred roofing material in alpine areas. This, and many other design suggestions, can be found in Australian Standards HB 106 - 'Guidelines for Design of Structures in Snow Areas'. Particular attention is drawn to maintaining an adequate roof slope for snow shedding, and screw fixing of deck pans beneath the ridge capping.
Downward load capacities for Stramit Speed Deck UItra® decking have not been tabulated, but can be assumed to equal the outward capacities shown.
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.
Stramit Speed Deck Ultra® decking has excellent resistance to the problems associated with thermal expansion. Nevertheless sheet lengths should be limited to those shown below.
Maximum Sheet Length (m)
| roof colour |
light |
dark |
| flat |
35 |
25 |
| Spring-curved |
30 |
20 |
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