Greengates Builders Merchants

Installing Roofing Felt: A Step-by-Step Guide

The roof is a property's first line of defence against the elements and, as such, should always be kept in tip-top condition. Greengates, your local builders merchant, supplies a comprehensive collection of roofing materials which includes corrugated sheets, slates, tiles, timber, battens, gutter accessories and dry ridge systems. The collection also includes felt for flat roofing applications.

In this edition of the Greengates blog, we'll share with you a step-by-step guide on how to install roofing felt for professional results.

Primarily used to provide robust, durable and cost-effective protection to the flat roofs of many structures such as sheds, garages and extensions, roofing felt is particularly versatile. Even for those with little DIY experience, installing roofing felt is a quick, simple and rewarding project./p>

  • As with any construction project, good preparation is absolutely key. Ensure that the roof surface is sound and is completely free of any dirt or debris. Check that there are no obstructions present such as protruding nail heads. If replacing an old felt roof, remove all of the old felt, along with any nails or adhesive. 
  • Roofing felt should be laid on timber that is tolerant to moisture or onto chipboard that is installed on top of treated timber joints.
  • The first layer of felt will be the foundation for subsequent layers so pay close attention to getting it right first time to avoid later issues. Starting at the roof's lowest edge, roll out the felt perpendicular to the full. When you have established how much felt you need, cut accordingly.
  • Starting from the centre of the sheet, begin nailing the felt into place. It is best to used galvanised clout nails (available from Greengates in several pack sizes) for this purpose. Using nails as opposed to adhesive for this first layer allows the felt to accommodate natural movements of the timber beneath, which can be caused by changes in moisture content and temperature. 
  • Now it's time to add a second layer, which this time will be secured with adhesive. For professional results, we recommend Cromar Roofing Felt Adhesive, available to purchase from our website. Ensure that any joins of the felt are in different places from those of the first layer.
  • Allow the adhesive to completely dry.
  • Finally, add a third layer in the same way as the preceding layer. 

Please browse the Greengates website for more information about roofing felt and the required accessories.

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