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Ryton Building Products' rafter roll ventilator is claimed to be a simple, highly effective means of allowing the continuation of free air from the soffit area to the roof void.The product comprises a 4 m roll of corrugated high quality plastic which is simply attached at one end of the rafters and rolled out across a 4 m run. It is said to be suitable for any rafter centres. Each roll gives 100,000 sq mm of free air ventilation for each length, equivalent to 25,000 sq mm a metre. Ryton says that this ensures compatibility with most roof specifications.The product is for use with Ryton's other roofing products.Rytons, Tel: 0536 511874. CONSTRUCTION NEWS