At a glance

Batten spacing for a metal roof must suit the exact sheet profile, material thickness, span, loads and installation system. Tile-effect sheets often follow a product-specific module, while trapezoidal sheets and standing-seam systems have different support requirements. Battens and counter-battens form part of the roof build-up; they are not a substitute for the main structural frame. This guide explains the examples in the January 2023 source and why they cannot be used as a universal installation table. Confirm the project details, eaves arrangement, fixings and ventilation before work begins, using the selected product’s instructions and the structural design.

Tile-effect steel sheets

The transverse module often determines the regular batten spacing. The source gave 350 mm as a common example and mentioned products with modules between 250 and 400 mm. These are examples, not dimensions for every sheet.

Use the actual installation drawing, including the first-batten and eaves detail. Measuring the visible pattern alone does not establish every support position.

Trapezoidal steel sheet

Profile height and sheet thickness influence spanning capacity, together with steel grade, loading, support conditions and fixings. A taller profile does not by itself authorise a particular spacing.

The source’s 500–600 mm example must be checked against the actual load/span data and design. It is not a universal support rule for every trapezoidal sheet.

Standing seam and clay tiles

Standing-seam and click systems may require continuous decking or a specified arrangement of boards or battens. The source’s proposed 250 mm spacing and separation mat are not automatically appropriate for every system.

Clay-tile batten gauges also depend on the tile, overlap, roof pitch and installation instructions. The source’s broad 150–350 mm range cannot replace the product’s setting-out procedure.

Setting out and fastening

Set out the roof from the specified eaves reference and check alignment and measurements before covering. Battens need the designed section, bearing and attachment to the supporting structure.

Roofing screws must suit the sheet and timber or steel substrate. The source’s general description of every roofing screw as a pan-head, self-drilling timber screw with an aluminium washer is inaccurate. Use the specified head, point, washer, seal and corrosion protection.

Do not fix only every second batten or rely on a universal five-to-eight-screws-per-m² rule. Edge zones, wind uplift, laps and profile details require the actual fixing schedule.

Follow the system’s laying direction and lap instructions. The prevailing wind alone does not define a safe universal installation direction, and windy conditions may make handling sheets unsafe.

Ask about roofing materials

Are counter-battens needed?

In many pitched-roof systems, counter-battens create a drainage and ventilation space above the underlay and support the battens. Their role depends on the complete roof design.

Continuous decking does not automatically remove the need for a ventilation space, and counter-battens are not a cure for an uneven or unsound structural frame.

Keep the designed eaves-to-ridge air and water paths open. If the proposed system omits counter-battens, that should follow its documented build-up rather than a general shortcut.