6. Supporting sandwich panels purlins number and spacing of purlins arranged by the board of the bearing capacity and roof trusses roofing beams and other requirements of the decision, but under normal circumstances should be supported by a board of at least three purlins. In the face of the ridge line and the plate longitudinal slit oblique, oblique oblique ridge line must be set to ensure that the steel sandwich panel purlin oblique ends support conditions. Purlins and roof slope surface must be parallel to ensure inter-plate and purlin was face contact. In the long to lap the two plates, purlins flange width should be no less than 100mm, less than should set up a dual purlins, or add long pass welding angle iron. On each slope at the edge of the roof purlins rhyme and two plate length to lap purlins, should pass a long pre-fight card. 2 rivet hole spacing 300mm, avoid high altitude drilling difficult. Color steel sandwich panel roof itself is a lightweight roof envelope, purlins should be used lightweight cold-formed steel, steel for savings, reducing difficult drill drill is very beneficial, but it should be really good job in anti-corrosion treatment.
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