Steelform Quattro 25mm Nailstrip is a favourite among those who seek the look of architectural cladding, without complicated technical installation details. The Quattro 25mm Nailstrip has a thin rib and wide tray with a concealed perforated fixing strip along one side. There is no need for fixing clips or the additional operation of crimping, this ensures speed and ease of installing panels whilst allowing for expansion and contraction. This exceptional system is a popular choice due to its striking look, yet simple installation.  

*For more technical information, please either download the factsheet or contact a Steelformers representative.

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  • Suitable for residential, light commercial and commercial roofing and cladding applications

  • Available in 0.55mm BMT (G300) COLORSTEEL® ENDURA® AND MAXX®, 0.75mm BMT Copper, 0.9mm BMT mill finish aluminium and ColorCote® AlumiGard (available on request, conditions apply)

  • In accordance with Acceptable Solution E2, the minimum roof pitch is 3°

  • Rollformed in our New Plymouth factory 

  • Sheet lengths are custom run to order

  • Fixed over solid ply substrate with concealed fixings (for roofing), fixed over 20mm cavity batten with ply substrate (for wall cladding) 

  • 25mm standard rib height

  • Pan widths are customisable to the customers reference, our standard pan widths are (rib to rib) 185mm (cladding only), 265 and 405mm

Pans & Swages

It is standard Steelformers practice that the pans are run with swages, for extra rigidity and strength, and for reducing wind-driven roof noise. If the customer wants to run the pans without swages to achieve a smooth finish, it is at the discretion of Steelformers and is judged on a case by case basis. In very high and extra-high wind zones it is mandatory to run the pans with swages. 

Fasteners & Fixings

Quattro 25mm Nailstrip roofing must always be installed over a solid plywood substrate, with purlin supports underneath. The required plywood substrate must be a minimum 12mm thick plywood sheet, structurally fixed to the frame in accordance with the New Zealand Building Code.

The panels are connected by an interlocking groove, giving it an elegant appearance of a recessed join. Nailstrip panels are laid and fixed directly to the timber substrate along the perforated strip at 400mm centres with concealed screws or nails. The high rib is then placed over the low rive and snapped into place along the length of the panel. Fasteners that are used to secure Quattro 25mm nailstrip down was roofing must penetrate through the substrate and into the purlin a minimum of 30mm for timber and 6mm for steel purlins.

Fixing example:


The following shows the recommended clip fixing positions per wind zone. 

450mm purlin centres, with min. 12mm ply substrate

Clips fixed at 405mm centres


N.B. In very high and extra-high wind zones it is mandatory to run the pans with swages. 


This is a general guide only, for further information please refer to the NZMRM Code of Practice or consult a Steelformers representative. 

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