| Specification | SF-60 |
|---|---|
| Box section | 60 × 30 mm, wall 3 mm, 1 cell |
| Weight | 0.98 kg/m (about 5.9 kg per 6 m) |
| Max rafter spacing, W0 0.65 kPa (zone I) | 1.9 m |
| W0 0.95 kPa (zone II) | 1.6 m |
| W0 1.25 kPa (zone III) | 1.4 m |
| W0 1.55 kPa (zone IV) | 1.3 m |
| W0 1.85 kPa (zone V) | 1.2 m |
Spans are for plastic roof sheets or plastic roof tiles, purlins spaced at 660 mm, deflection limited to L/200. W0 is the basic wind pressure of the Vietnamese wind zones I – V; compare it with the design wind pressure of your site.
Where is SF-60 used?
SF-60 is the smallest Santiago FRP purlin. It suits verandas, small houses and seaside houses with rafters placed close together, about 1.2 – 1.5 m apart. If the rafters are 1.5 m apart and the wind pressure is 1.25 kPa or more, use SF-80 instead.
What to watch on steep tiled roofs?
The SF-60 box is only 30 mm wide, so it is weaker across the roof slope than the larger sizes. On tiled roofs steeper than 25° with rafters more than 1.2 m apart, add purlin ties (sag rods) or change to SF-80.
What is supplied with SF-60?
Santiago FRP cuts SF-60 to the rafter spacing, drills the holes at the rafters and supplies 304 stainless fittings sized for SF-60: L-brackets, bolts, nuts, washers, anti-crush sleeves, self-drilling screws and end caps. Each length is printed with SANTIAGO FRP, SF-60, the batch number and santiagofrp.vn. How to fit them: installing FRP purlins.
Frequently asked questions
What are the dimensions of SF-60?
SF-60 is an FRP box section 60 × 30 mm with a 3 mm wall, single cell, weighing 0.98 kg per metre.
What rafter spacing can SF-60 span?
With purlins at 660 mm under plastic roof sheets, SF-60 spans up to 1.9 m at a basic wind pressure of 0.65 kPa, 1.6 m at 0.95 kPa, 1.4 m at 1.25 kPa, 1.3 m at 1.55 kPa and 1.2 m at 1.85 kPa.
When should I choose SF-80 instead of SF-60?
When the rafter spacing is above the SF-60 limit for your wind pressure, for example 1.5 m rafters at 1.25 kPa, or on tiled roofs steeper than 25° with rafters over 1.2 m apart.