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Roofing Battens
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John Brash battens are manufactured from imported timber from sustainable forests and guaranteed for 60 years against decay when used above dpc level.
The imported timber used is 17% stronger in bending and stiffer in stiffness than home-grown timber. It benefits from slow growth, close tight annual growth rings, and a lengthy growth cycle. The result is an inherently strong and quality final product that meets the strict guidelines of BS5534: Part 1: 1997.
BS Code of Practice
British Standard BS5534: Part 1: 1997 is the latest edition of the Code of Practice on slating and tiling. It replaces the edition first published in 1978, later updated in 1990. The new British Standard has significant commercial implications for everyone in the construction industry involved with specifying, supplying or fixing slating and tiling battens.
It has been established that:
- Clearly marked and identified Type A species 25x38 can still be used for single lap tile applications at 600mm centres
- Minimum 25mm thickness should be used where possible for fixing at 400mm centres, in accordance with manufacturers' recommendations where smaller sizes such as 19mm were previously used
- As before, it is essential to use at least 25x50 for slating at 600mm centres
- There is now NO minus tolerance in thickness
John Brash & Co Ltd has implemented a marking system for all full to size 25x38 and 25x50 battens. Other sizes will be identified as before.
A revised edition of "The Timber Importers Guide to the New British Standard" is available.
A table showing revised batten sizes is given below, together with a password-protected batten calculator (Coming Soon!). Further calculations and full technical support can be supplied - call 01427 613858 or e-mail info@johnbrash.co.uk
TABLE 1: RECOMMENDED TIMBER BATTEN SIZES
From BS5534: Part 1: 1997 |
| Application |
Basic size of batten |
450mm span
width x depth (mm) |
600mm span
width x depth (mm) |
| Slates |
| Natural sized or random | 25 x 50 | 25 x 50 |
| Fibre cement or concrete | 25 x 38* | 25 x 50 |
| Clay and concrete tiles |
| Double lap | 25 x 38 | 25 x 50 |
| Single lap | 25 x 38 | 25 x 50 |
| TABLE 2: SUGGESTED BATTEN SIZES BASED ON THE CALCULATION METHOD USING TYPE A SPECIES FROM JOHN BRASH & CO LIMITED From British Standard BS5534: Part 1: 1997Annex G, Annex H and NFRC Technical Bulletin TB15 |
| Application on Pitched Roofs |
Basic size of batten |
450mm
single or double span
width x depth (mm) |
600mm
single or double span
width x depth (mm) |
| Slates |
| Natural sized (min. 30° slope) | 25 x 50 | 25 x 50 |
| Natural random (min. 30° slope) | 25 x 38 | 25 x 50 |
| Fibre cement (min. 30° slope) | 25 x 38 | 25 x 50 |
| Concrete (double lap) (min. 30° slope) | 25 x 38 | 25 x 50 |
| Clay and concrete tiles |
| Double lap (min. 35° slope) | 25 x 38 | 25 x 38* |
| Single lap (min. 30° slope) | 25 x 38 | 25 x 38* |
| * Now marked in accordance with NRFC TB15 Note 5 |
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