Type 17 Screw With XGRiP

Metal to wood roofing screws with a Type 17 point

These are Hobson DRiLLX Type 17 self-drilling screws with a hex head, sealing washer and XGRiP. Hobson designs the Type 17 point for drilling through lighter steel sections and fastening into timber, and this #14-10 comes only in long lengths, 110 to 300mm, for crest fixing metal roof sheeting into timber battens, trusses and framing through deep profiles, insulated panels, insulation or packing. For ordinary roof sheeting and wall cladding fixed straight onto timber battens, Hobson lists the shorter Type 17 #12-11 screw with XGRiP in 50 and 65mm (see Type 17 #12-11 screws with XGRiP under Related) for crest fixing roofing profiles and wall cladding to timber and steel battens. Hobson's data lists these #14-10 screws in C1022 hardened steel with a Class 4 finish.

XGRiP, the short thread under the head, keeps the sheet clamped onto the seal so it stays watertight under foot traffic.

Fixing into steel battens or purlins instead? Use the metal point tek screw with XGRiP, or the vmaX roofing screw, whose universal point Hobson says suits timber trusses and steel purlins up to 1.9mm.

Choosing the length for timber

• •#14-10 is 14 gauge (6.3mm thread) with 10 threads per inch, a coarse thread by Hobson's definition (up to 16 TPI).
• •Hobson measures hex screws with a flange or seal from under the head.
• •Embedment: as a general rule, Hobson asks for at least 35mm of a 14 gauge screw in the timber for maximum pull-out. Add the height of the sheet profile at the crest, plus any packing or insulation the screw passes through, to 35mm, and pick the next length up.
• •Hobson publishes no performance data sheet (pull-out values) for this #14-10 screw. How many screws go in each sheet and batten comes from the roof sheeting maker's installation guide or the building designer, especially in high wind areas.

Type 17 XGRiP screw sizes

Every length we carry, all #14-10. Select a row to open it in the selector, then pick the colour.

Painted heads in COLORBOND colours

Every length comes unpainted or with the head painted in one of 33 colours from Hobson's COLORBOND list; the selector names each one, with the New Zealand name Hobson gives in brackets. Bushland, Wilderness, Loft, Headland, Sandbank, Pale Terracotta, Blue Ridge, Plantation, Primrose and Stone are discontinued COLORBOND colours that Hobson paints on request, so ask us before ordering them. Hobson's warranty covers the screw, not the paint. COLORBOND is a registered trademark of BlueScope Steel Limited.

Class 4 coating and warranty

These #14-10 screws are Class 4 (AS 3566.2), the 38 micron mechanically galvanised coating that Hobson's finish guide lists for severe marine (C4) exposure. On a long screw through insulation or packing only the head and washer sit outside, and that is the part Hobson's warranty covers. Class 4 warranty periods:

• •Conditions: screw gun installation to Hobson's instructions, and fresh water wash-downs at least every six months in C2 and C3 and every three months in C4 and C5. Staining, dulling and paint wear are not covered.
• •Not recommended for very severe marine (C5) sites, where Hobson's warranty covers only 316 bi-metal. Extreme (CX) sites need Hobson's written confirmation first, and Hobson advises professional advice on your site's category (ISO 9223 and AS 4312), or ask us.
• •Treated pine: Hobson makes its Tykote coating specifically to resist treated pine chemicals, and its warranty excludes contact with incompatible materials. Ask us before fixing these into treated pine.

How to fit Type 17 roofing screws

Hobson publishes no installation sheet for this #14-10 screw. Its data sheet for the Type 17 #12-11 XGRiP screw (260709DS) gives these steps, which we suggest here:

1. Fit a hex nut setter to suit the head in a cordless screwdriver set between 2,200 and 3,000 RPM. Hobson does not recommend impact drivers on its XGRiP roofing screws.
2. Place the screw on the crest over the batten or truss, square to the sheet.
3. Apply consistently firm pressure while the point cuts through the sheet and into the timber.
4. Take care not to overtighten, as Hobson warns that sealing washer damage could result. As general practice, stop when the seal is pressed onto the sheet.
5. Clear the drilling swarf off the sheet at the end of each run (general practice): left on the roof it rusts and marks the paint.

Metal to wood roofing screws in Adelaide

Allmat supplies Type 17 XGRiP screws, roofing screws and nut setters, with the timber battens and framing to go with them, to roofers, builders and trade across Adelaide and South Australia. Add them to a quote with the rest of your list and we will price the lot.

Questions