Building systems
Sigma
A classic 22° dual-pitch profile. Spans 6–17 m.
Roof pitch
22°
Frame spacing
4 or 5 m
Width
6–17 m
Eaves height
2.5–5 m
Length
from 10 m
Typical uses
Garages, warehouses, hangars, workshops, industrial, retail, sports and office buildings, shops.
Not recommended for residential buildings.
The frame is fully galvanised. Columns and roof beams are single cold-formed Sigma320 or Sigma400 sections.
Connections are bolted. Z120 or C120 purlins and galvanised rebar wind bracing provide stiffness.
Uninsulated cladding is TR45 sheet; insulated cladding is sandwich panels. Facades can take windows, doors and gates; the roof can take translucent openings. A first floor is possible.
Examples
Other systems
AstraA universal system with parallel-chord roof trusses. Spans 12–27 m.
AstrigmaA single-span system on Sigma beams. Spans 8–17 m.
CeptraA clear-span system on triangular roof trusses. Up to 37 m.
Delta+A compact system for agricultural and utility buildings. Spans 6–15 m.
FlatrigmaA near-flat roof with a perimeter parapet. Spans 8–17 m.
FlatroA flat roof on parallel-chord trusses. Spans 13–20 m.