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Material path
Light gauge flashing and gutters with HSS slitter.
Primary blade: HSS Slitter
Sheet flashing slits usually start with thin galvanised coil, pre-painted flashing stock, or light aluminium used for gutters, ridges, and counter flashing. On this path the HSS Slitter is set up to keep narrow strips straight, with burr controlled so folded edges and hemming stages do not fight the next operation. Width accuracy matters when installers are matching roof sheets, barge details, and valley pieces on site.
Begin by noting the metal type, thickness, coating, and target strip width before the first feed. Then check arbor spacing, blade overlap, and side clearance so the slit stays clean without rubbing heat into the coating. After the first lengths are cut, inspect both edges for feathering, camber, and paint pickup before running the full batch.
Summer heat in Gauteng and coastal humidity in Durban can both affect how light gauge flashing handles during slitting and stacking. Thin material marks easily, so keep tables clean and separate packed strips with dry interleaves where the finish needs protection. If power interruptions break the run, re-check width and edge condition when the line starts again rather than assuming the previous setting held.
For slit flashing stock, the useful note is not only the blade name but the condition of the edge that must still bend, lock, or tuck into a gutter profile. A narrow burr can become a problem later at the brake, especially on pre-painted material where edge damage shows quickly. When sending a query, include sheet type, thickness, required slit width, and whether the strips are for roll forming, folding, or simple trim sections.
Roofing and rainwater shops around Johannesburg, Pretoria, Cape Town, Durban, and Gqeberha often move from slitting straight into bending or roll forming. Clear handover notes help the next station know which face must remain visible and which edge will be concealed in the finished flashing. That is especially useful on colour-coated stock where orientation matters.
This cut path goes off track when light gauge sheet is treated like heavier plate and the setup is left too aggressive. Excess pressure, dirty spacers, or worn slitting edges can leave burr, edge wave, and tracking drift across long strips. Very narrow widths also need closer watching because a small alignment issue shows up quickly over a full length of gutter or apron flashing.
On South African roofing work, scrap often comes from mixed batches of galvanised and pre-painted stock being run under one setting. Check the matching kerf note and send details through the contact form if the strips must suit a specific brake, roll former, or site width. Include your city, material thickness, and the narrowest slit in the batch so the blade path can be matched properly.
Primary path: HSS Slitter. Browse more under Blades and Kerfs.
A good message mentions the sheet material, thickness in millimetres, finished slit widths, and the machine bore or arbor arrangement in use. Add photos when you see edge pickup, paint marking, or wandering strips, because those clues often point to spacing or wear rather than the stock itself. If the strips will be folded into gutters or flashing trays, say so up front.
Setup parts under Holders can matter as much as the blade when thin flashing sheet is being guided and separated. Printed references in Resources are useful for width checks, burr direction, and inspection points that operators can keep near the slitter. Keeping those notes close to the machine helps repeat narrow runs with fewer avoidable marks.
Operated by Astros Marketing (Pty) Ltd. Use our contact form.
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Slit flashing queries should come through our contact form with blade diameter, sheet gauge, and your site in Kya Sands, Johannesburg.
