BW Industries - Monopitch Roof

For monopitch and other roofs where there is no restraint to the ridge purlin via apex ties some equivalent anchor must be used. This may take the form of a simple tie to a substantial ridge beam or alternatively by a combination of struts and diagonal bracing between the top two purlins. Restraints should be used at mid-span for purlin spans greater than 3.5m and at one third and two thirds of span for purlin spans greater than 7.5m. For long roof slopes additional diagonal bracing may be required.