Graded Roof Batten Treated 25 x 38mm x 3.6m
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Product Details
BS5534 graded and pressure treated sawn roofing batten, 25 x 38mm in a 3.6m length. This is the standard batten size for fixing roof tiles and slates and is also widely used for counter battening over membranes. Graded battens are typically marked blue or red and certified for structural use on roofs.
As of August 2026, PriceNailer data confirms that the cheapest price for Graded Roof Batten Treated 25 x 38mm x 3.6m is £2.06 from Jewson across 3 suppliers. Prices have increased by 6.8% over the last 2 months.
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Frequently Asked Questions
What does BS5534 graded mean for roof battens?
BS5534 is the British Standard for slating and tiling that specifies the minimum quality and strength requirements for roof battens. Graded battens are visually or machine assessed to ensure they are free from defects that could compromise structural performance on a roof. They are typically marked with a blue or red stamp to confirm certification, which is often required by building regulations and roofing warranties.
How many 25 x 38mm roof battens do I need per square metre?
The number of battens required depends on your roof tile or slate gauge, which is determined by the specific tile manufacturer and roof pitch. As a rough guide, a gauge of around 100mm (suitable for many standard concrete interlocking tiles) would require approximately 10 batten runs per metre of rafter. Always check the tile manufacturer's laying instructions to confirm the correct gauge and calculate your batten quantity accurately.
Is 25 x 38mm the standard roof batten size in the UK?
Yes, 25 x 38mm is the most commonly used roof batten size for fixing standard roof tiles and slates in the UK. It meets the requirements of BS5534 for the majority of domestic roofing applications where rafter spacing does not exceed 600mm. For wider rafter centres or heavier tiles, a larger batten size such as 25 x 50mm or 38 x 50mm may be required as specified by BS5534 span tables.
Can I use 25 x 38mm treated battens for counter battening over a roofing membrane?
Yes, 25 x 38mm pressure treated battens are widely used as counter battens, fixed vertically over a roofing underlay or breathable membrane before the horizontal tiling battens are laid. This creates a ventilation zone beneath the tiles, which is increasingly recommended under BS5534 to manage moisture and improve roof longevity. Ensure the battens are pressure treated to withstand exposure in this position.
What is the difference between blue graded and red graded roof battens?
Blue graded and red graded roof battens both comply with BS5534 but are certified for different maximum rafter spacings. Blue graded battens are suitable for rafter centres up to 600mm, while red graded battens are certified for rafter centres up to 450mm. For most modern domestic roof constructions with rafters at 400mm or 600mm centres, blue graded battens are the standard choice, but always verify the correct grade using the BS5534 span tables for your specific tile and rafter spacing.