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Eg (1 of 100x200x2.4m)
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Sawn timber firrings, cut to order from structural softwood, are tapered sections fixed to flat roof joists to create a drainage fall. Available in a 50 mm rise over lengths from 1.2 m to 4.8 m, these firrings help achieve the 1:60 minimum fall required under UK Building Regulations Part C.
| Property | Detail |
|---|---|
| Material | Structural softwood |
| Grade | C16/C24 sawn |
| Finish | Sawn |
| Profile | Tapered (firrings) |
| Rise | 50 mm |
| Available lengths | 1.2 m, 2.4 m, 3.6 m, 4.8 m |
| Cut | Cut to order |
Store firrings flat and off the ground in a dry, ventilated area before installation. Allow them to acclimatise to site conditions for at least 48 hours, particularly in heated buildings, to reduce the risk of movement after fixing. Fix firrings to joists using ring-shank nails or structural screws at regular centres, ensuring each tapered section runs in the correct direction to maintain a consistent fall toward the outlet or gutter.
What fall do 50 mm rise firrings give over a 2.4 m length?
A 50 mm rise over 2.4 m gives a fall of approximately 1:48, which exceeds the 1:60 minimum recommended under Building Regulations Part C for flat roofs. This makes the 2.4 m length suitable for short roof spans where a steeper fall is acceptable.
Can I order firrings cut to a specific length?
Yes. Nottage Timber Merchants cuts firrings to your specification. The standard lengths available online are 1.2 m, 2.4 m, 3.6 m and 4.8 m. For bespoke lengths or quantities, call the yard on 01656 745959 with your measurements and the team will advise on the most suitable option.
What timber grade are your firrings cut from?
Firrings are cut from C16 or C24 graded structural softwood, the same grades used for joists and rafters on UK construction projects. Both grades are suitable for flat roof applications, though C24 offers a higher strength classification where structural loading requires it.
For related structural timber, browse the C16 graded timber collection at Nottage Timber Merchants. We supply trade and DIY customers across Bridgend and South Wales, with next-day delivery available to many local areas.
| Variant | Quantity | Price | Total |
|---|---|---|---|
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50mm Rise / 1.2m
35920-50-12
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50mm Rise / 2.4m
35920-50-24
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50mm Rise / 3.6m
35920-50-36
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50mm Rise / 4.8m
35920-50-48
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75mm Rise / 1.2m
35920-75-12
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75mm Rise / 2.4m
35920-75-24
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75mm Rise / 3.6m
35920-75-36
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75mm Rise / 4.8m
35920-75-48
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100mm Rise / 1.2m
35920-10-12
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100mm Rise / 2.4m
35920-10-24
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100mm Rise / 3.6m
35920-10-36
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100mm Rise / 4.8m
35920-10-48
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150mm Rise / 1.2m
35920-15-12
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150mm Rise / 2.4m
35920-15-24
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150mm Rise / 3.6m
35920-15-36
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150mm Rise / 4.8m
35920-15-48
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200mm Rise / 1.2m
35920-20-12
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200mm Rise / 2.4m
35920-20-24
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200mm Rise / 3.6m
35920-20-36
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200mm Rise / 4.8m
35920-20-48
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