Top Duo Roofing Screws

Top Duo Roofing Screws – a dual thread roofing screw for warm roof deck insulation. For fastening insulation on roofs with thicknesses up to 300mm, to overall eliminate the compression of the insulation. Comes available in either a cylinder head or a flange head. The Topduo double-threaded screw allows secure fastening of over-rafter insulation with both pressure-resistant and non-pressure-resistant insulating materials. Of course, the high extraction resistance in both connecting timbers also makes the Topduo attractive for many other applications in the field of timber-frame construction.

Top Duo

Top Duo Available Sizes

Size (Diameter x Length)Box QuantityUPC
8.0mm x 165mm504250207467397
8.0mm x 195mm504250207467403
8.0mm x 225mm504250207456179
8.0mm x 235mm504250207456186
8.0mm x 255mm504250207456193
8.0mm x 275mm504250207456209
8.0mm x 302mm504250207456216
8.0mm x 335mm504250207456223
8.0mm x 365mm504250207456230
8.0mm x 397mm504250207456247
8.0mm x 435mm504250207456254
8.0mm x 472mm504250207467410

Product Data Sheet

Approved ro ETA-11/0024


Corrosion Protection, Blue+ is an innovative coating system with greater corrosion resistance than standard electro-galvanised surfaces. In the blue+ system, a sealant is applied to a galvanised surface and also reacts with it. In this way, any overall weak points in the galvanisation are safely sealed and protected. The coating is free of chromium (VI) oxide, which is classified among other things as being significantly hazardous to the environment. Surfaces treated with blue+ have an overall excellent resistance to mechanical stress.

Top Duo
Top Duo Eurotec screws
Insulation fixings

If you would like more information on Top Duo Screws, then please contact the Swiftfix team.

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