How to Replace a Shed Roof

Last updated 7th October 2020 - Reading time: 8 mins

This article aims to explain how to replace shed roof felt. We will highlight all of the tools, materials and safety equipment needed to complete a replacement for shed roofing, and we will provide a step-by-step guide on how to replace your garden shed roof.

replace a shed roof

What Tools Do I Need to Replace a Shed Roof?

Replacing a shed roof requires a number of tools in order to successfully complete the job fully. Below is a list of the tools that you’ll need to replace a shed roof:

  • Tape Measure
  • Marking Pencil
  • Ladder
  • Straight Edge
  • Builder’s Knife
  • Hammer
  • 40mm Wood Nails

What Safety Equipment Do I Need to Replace a Shed Roof?

There is no particular safety equipment needed for a replacement roofing job, however, there are some health and safety steps you can take to ensure the job is completed as safely as possible.

  • Always be aware of children when completing this type of work and never allow children to play with your building tools.
  • Always use your ladders on stable ground and get someone to help steady the ladder for you if necessary.

What Materials Do I Need to Replace a Shed Roof?

Below is a list of the materials that you’ll need to replace a shed roof:

  • Shed Roofing Felt (the amount you need will depend on the size of your shed roof)
  • Felt Nails
  • Fascia Boards (cut to size of roof)

How to Prepare for Replacing a Shed Roof

To prepare for replacing your shed roof, you will firstly need to remove the old felt from your roof to make room for the new felt. This is quite straightforward and requires you to simply pull away the felt from the roof and remove any fixings from the old roof. This ensures that your new felt roof can be added easily and correctly.

Before starting the roof replacement process, you will also need to measure your felt to the size of your roof. You should arrange your roofing felt so that there is a 50mm overhang on the eaves and a 75mm overhang on the gable ends. This is so that you can tuck in the edges so that it’s all nice and neat once finished.

replace a shed roof prep

To measure up the number of felt pieces you’ll need, simply place them on top of the roof allowing the appropriate overhang. Most roofs will need 3 pieces of roofing felt, however, some larger or smaller than average sheds may need different amounts.

The pieces will usually consist of one on one side, one on the other side, and then a third piece over the top of the two side pieces to cover the joints in the middle.

How to Replace a Shed Roof Yourself - Step by Step Guide

Step 1

The first you need to do is to mark-up where the felt is going to start. Use a tape measure to measure where your felt pieces are going to start on the roof and then create a marking in this place on either end of the roof using a pencil.

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You will then need to get a straight edge piece of timber so that you can create a full line across the length of the roof. This is so that you know where your felt is going to start for the later steps.

Step 2

Using your measurements for the length of the shed (including the 75mm overhang), cut your felt pieces accordingly.

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Do this using a tape measure on a flat surface to ensure you cut the felt in a straight line and to the correct measurements. The felt should easily cut using a builder’s knife.

Step 3

Now it’s time to put your felt up on the roof in its position. Offer up the felting piece to your shed roof and ensure that it’s in line on all sides and offers the correct level of overhang (50mm on the eaves and 75mm on the gable ends), then, nail the piece of felt onto the roof with a hammer to secure it.

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Step 4

Once your first piece of felt is up, repeat the step of measuring up where your second piece of felt will line up on the roof, and create a marking once again the same as in step one.

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This ensures that you know where to offer up the second piece of felt on the roof when the time comes. Repeat this step as many times as needed until you have completely covered all the surface area of the roof.

Step 5

Line up your extra pieces of cut felt to the edges, ensuring that they line up with the 75mm overhang on the gable ends. Each piece of felt should overlap slightly. Ensure that the top pieces are the ones that overlap so that when water runs down the roof, it keeps running down and runs off over the sheets rather than running underneath them.

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Step 6

Measure along the edge of your felt at 100mm intervals and then hammer in felt nails all along the eave. This will ensure that your felt stays securely in place at all times. Do this along the top and bottom sections to ensure full security.

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Step 7

It’s now time to sort out your overhang. Using your builder’s knife, cut the centre point of the overhang and fold it over. Once that’s done, simply nail the overhang to the side of the shed to keep it from flapping around and to secure it tightly in place. Use felt nails at 100mm intervals for the best results.

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Step 8

Secure your fascia boards to the front of your shed over the overhanging felt using 40mm wood nails. A good tip would be to part nail these in once you offer up the complete fascia to the shed to make it easier to ensure that it’s lined up correctly.

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Once you’re happy with the line up, you can then fully drive the nails in to secure it in place.

Step 9

To neaten up the look of your roof, use your builder’s knife to trim off any felt that may be hanging down below the level of the fascia. Simply go along the bottom of the fascia using your builder’s knife and remove all of that excess felt. This will create a neat finish.

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Step 10

Where the felt hangs over the sides of the eaves, simply fold the excess felt under the overlay and then use felt nails underneath to nail it properly and securely in place.

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If you shed comes with a fascia for the side, all you will need to do is repeat step nine as necessary until all fascia pieces are up.


What Pitch Should My Shed Roof Be?

The pitch that your shed roof needs to be will depend on the design of your shed. The manufacturer of your shed will provide a minimum pitch recommendation which you should follow to ensure water tightness. A low pitched roof is usually sloped at 10-20 degrees.

How Do I Make My Shed Walls Waterproof?

Timber treatment both inside and outside your shed walls can help by providing a water-repellent coating to the wood.

How Much Overhang Do I Need When Felting My Shed Roof?

It is recommended that you leave a 50mm overhang on the eaves and a 75mm overhang on the gable ends.

Do I Need Planning Permission For A Shed?

You don’t need to seek planning permission for a garden shed provided that it is a single storey shed that is no higher than 4m. It also needs to be at least 2.5 metres away from the main house and it can’t take up any more than 50% of your garden.

How Often Do I Need To Replace A Shed Roof?

Shed roofs usually last for around 5-7 years so should be replaced based on this timeframe. However, if you notice your shed roof is beginning to become shabby, or if it is starting to leak then you may have to replace or perform a shed roof repair sooner.
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