How to replace a felt roof on a garden shed
123 views Apr 25, 2018
Your garden shed takes an incredible pounding from the weather and while most homeowners regularly apply creosote or paint to preserve the walls – the roof is inevitably left to look after itself – until the day it starts to leak.

Once water begins to come through the roof most sheds, by the very nature of their soft wood structure, quickly rot and if remedial action is not taken then most will soon be looking for a replacement.

Replacing a felt roof is not as hard as it looks and only requires basic DIY skills and a little help from a friend or neighbour. Simply follow these easy steps and your shed will be as good as new.

  1. You will need at least half a day to complete the project and will require Shed Felt, Roofing Felt Adhesive and Clout Head Nails.
  2. Make sure you also have the right tools such as a tape measure, sharp knife gloves, an old cloth, straight edge hammer 2” or 3” and a disposable paint brush.
  3. Before you start clean and tidy up the surrounding area, including the floor. To ensure you are properly prepared for later, unpack and roll your shed felt onto a clean and dry surface. This allows it to relax or straighten after being rolled up. Roofing felt is harder to work at low temperature so try to avoid working with it below 10° or in wet or windy conditions.
  4. Prepare the surface of the shed roof by removing any old roof felt or nails. Ensure the surface is flat, clean and dry. If the roof is rotten or damaged, you may want to apply a complete new sheet of ply.
  5. Measure your shed by running a tape measure along the bottom of the roof (the eaves), and up the diagonal end (the gable). Write down these measurements (it’s easiest to use metric as shed felt normally comes in 8m or 10m rolls). Remember too that you will need the felt to overhang each gable end, and the eave of the shed by at least 50mm (so you need to add this to your measurements).
  6. Calculate how many lengths of roof felt are needed: The felt will be applied in strips, with each strip overlapping the previous one by at least 75mm. A final length sheet will be required along the ridge. Calculate how many strips and of what length you will need.
  7. Cut your roof felt to length: Using your straight edge and sharp knife, carefully cut your felt to the correct length (don’t forget to include the extra 50mm overhang at each end!)
  8. Nail on the first length: Position the first length of roof felt along the lowest part of the shed roof. Ensure that it overhangs the eaves and each gable end of the roof by 50mm. Nail along the top edge of the strip with the galvanised clout nails. Space the nails at 500mm centres.
  9. Fold over the gables and eaves: Starting at the centre of the eave, and taking care not to rip or tear the felt, fold the overhanging felt over the edge of the roof. Fix the overhanging felt using galvanised nails at 50mm.
  10. Fix the next length of shed felt: Take your second length of felt. Position this strip so that it overhangs the top of the first sheet by 75mm. Nail along the top of this strip at 500mm. Where the sheets overlap, apply roofing sheet adhesive using a disposable brush. Using a downwards brushing motion, firmly press the top layer of roofing felt onto the adhesive, taking care to ensure that the strip of felt does not ripple or crease. Nail in place at 50mm spacing along the bottom of the strip. Use an old cloth or rag to remove any excess felt adhesive. Continue to work up the complete side of the roof in the same method.
  11. Felt the second side of your shed: Repeat the same process for the opposite side of the roof.
  12. Fix the capping sheet: The roof should be finished with a capping sheet along the ridge. Place along the ridge of the shed so that it equally overhangs each side of the roof. Always ensure that it overlays the top strips of felt by at least 75mm. Apply roofing felt adhesive to the underside of both sides of the ridge and press the capping sheet into place. Nail along the bottom of each side of the capping sheet at 50mm intervals.

And that is all there is to it to ensure that your shed continues to provides many more years of useful life. You can source the materials you need from most local builders merchants or go on line. You can click the link below to Amazon to a supplier that has a five star rating if you prefer to have materials delivered.

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