How To Fit Fascia Boards To Flat Roof

Having an issue with the fascia boards on your flat roof? That’s probably what you brought here to our website, but not to worry, we’ll give you a simple explanation of what fascia boards are and how to fit them to your flat roof.

What Are Fascia Boards?

As we explain on our fascia boards replacement page, the fascia board is a protective cover for the timber joists in your roof that stops rain and snow from getting into your roof and wall cavities.

The fascia board is usually combined with a soffit to close off any gaps between the felt, wall and tiles of your home. This is commonly referred to as the roofline.

Poorly fit fascia boards can rot, which can result in water leaking into your home and causing damage, so it’s important that this is done professionally, especially if opting for a timber fascia.

Fitting Fascia Boards To Flat Roof

If you decide to fit your own fascia boards, it’s important that you know what you’re doing and carry out some preparations before you start, make sure you have anything you need to hand including any tools before beginning work.

It’s also important to understand what width fascia board you will need, they come in increments of 25mm and can vary in width from 100mm up to around 405mm, so make sure you measure correctly or consult an expert if unsure. All boards are 5 metres in length and and the board thickness that we use is 18mm.

Here are the steps for fitting your own fascia boards to flat roof:

  1. Start by fitting the sheathing and board, it’s up to you which comes first, but this makes the job more efficient.
  2. It may also be worth using sub fascias, which are boards behind the fascia, these help straighten up the main fascia if the rafter board is not sufficient.
  3. White fascias require 600mm centers as a minimum, while foiled fascias require a 40mm center. We recommend stainless steel nails with a plastic head.
  4. To allow for expansion, leave a gap of at 15mm between each joist in the roof and use superglue on one side of the joist to ensure they stick and do not detach overtime.
  5. If you need to install ventilation, this needs to be on top of the fascia board to comply with building regulations.

When fitting your fascia boards, make sure to keep your work environment safe and tidy at all times, be mindful of where all your tools are and if you’re using a ladder ensure it’s in good working condition.

If you are still a little unsure and would like to speak to an expert, feel free to contact our team and we will be able to advise you further or provide a quote for us doing the work for you in the event you are still not confident.

We have also written a detailed guide on installing fascias that you could read for a step by step guide to the entire process.


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