Heavy Duty Self Supporting Glazing Bars

Yes. The bars in this category are our heavy duty self-supporting range. They span between a wall plate and an eaves beam without a timber rafter beneath, up to 4m of unsupported projection. The bars carry the roof load themselves, which is why they are a heavier section than a snapdown rafter bar. They suit experienced DIYers and professionals rather than a first roofing project.

A bar for glass carries far more weight. Glass units weigh about ten times as much as multiwall, so the bar needs a heavier section. Our heavy duty self-supporting bars, wall plates and eaves beams are for 16, 25, 32 and 35mm polycarbonate only, and we do not sell them for glass. A glass roof needs a rafter-based glazing system; email the sales team.

These bars are designed for 16, 25, 32 and 35mm multiwall polycarbonate. The range does not go down to 10mm twinwall; for that you need a snapdown rafter bar. We do not sell them for glass units; no glass thickness is listed for them. The sheet width you can glaze depends on pitch and loading, so tell us thickness, pitch and projection when you order.

Not within the bar's rated projection. Our heavy duty bars span up to 4m from wall plate to eaves beam with nothing beneath. Beyond 4m you need rafters or intermediate support, and the usable projection falls as pitch drops and loading rises, so check with our technical team. The wall plate and eaves beam carry the bars, so fix them to something solid.

Yes. The heavy duty self-supporting bars on this page are in fact designed for 16, 25, 32 and 35mm multiwall polycarbonate, and that is their main use. Any bar stiff enough for glass has ample strength for polycarbonate, which weighs about a tenth as much. Use the matching edge bars, end caps and sheet closures to finish the roof.