How to Replace Fascia and Soffits Boards With Plastic Upvc

Over the last 16 years I have fitted roofline fascia and soffit boards to hundreds of houses. Here is my step-by-step guide, I hope you find it useful.

Below is some detailed information on exactly how I remove the old boards and replace them with a new system.

If you intend to use this guide on a DIY project, you should know that it’s not practical or safe to do this work from ladders. I own scaffold access towers and always use them for this type of work.

Pro Tip: Asbestos soffits were installed to millions of homes from the 1950’s through to the 1980’s. You shouldn’t remove or disturb this material unless you have received training. This page explains how to identify this material and also provides a cost guide to removing asbestos.

Step 1) Fully Remove the Boards

Existing boards and guttering – (see more in the photo gallery)

The first row of roof tiles are removed and set aside for re-use. Using a Stanley knife, cut the existing felt back a few inches from the front and then remove the guttering.

Instead of capping over existing boards like many cowboys do, the existing timber fascia and soffit boards should be removed using a crowbar/pry-bar. If the soffits are sealed to the window frames with a silicone/mastic sealant, then this can be cut with a knife.

The exposed rafters can now be checked for rot. If any is discovered it can be cut out with a saw and replaced. The timbers on the roof shown in these photos were in good condition and the rot was only present on the fascia boards that were removed.

Step 2) Fixing the Soffits

Fixing the soffit boards to the rafters – (more photos from this set in the photo gallery)

The new Upvc soffit boards are fixed to the underside of the timber rafter ends with stainless steel plastic capped nails.

Timber “packers” or lengths of baton can be used to close any gaps between the soffit and the rafter, I use 28mm thick timber baton, but I also keep several other sizes/quantities in the van as they are frequently needed.

The back of the soffit board rests on the top of the wall and is pinched down with timber “legs” to prevent the wind from lifting the board up.

The soffit boards used in this installation are 10mm thick and 5 metres in length, an expansion gap of 10mm is allowed for at each 5 metre joint. Alternatively you could use hollow cladding boards as a soffit here.

Are you looking for information about soffit and roof ventilation options?


Step 3) Fixing the Fascias

Fascia get fixed to the rafter ends – image  taken from the photo gallery

The 18mm Upvc fascia boards are then fixed to the timbers with 65mm stainless steel nails.

Two nails are used to prevent any buckling or pivoting of the boards. Don’t forget that these boards must hold the weight of the roof tiles, the guttering, rainwater and any snow or icicles that may form during winter.

All windows are now fully opened and closed to ensure the new boards are not obstructing them. If a window cannot be fully opened because the fascia is blocking it then the boards will need to be adjusted, possibly by trimming back the rafters. It is best to check the windows before fixing all the nails into place.

We have compiled a list of all the materials used in this installation. Think of it as a roofline checklist.

If you are unsure which nails to buy then here is a list of all the screws and nails I use on a typical roofline installation.

Step 4) Eaves Vents and Gutter Support Brackets

Vents and gutter support brackets are now fitted – see more photos like this in the gallery

A 10mm eaves vent strip (colour black) is then fitted to the top edge of the fascia board (you can see this in the photo to the right) to prevent loft condensation. It is secured with 40mm nails

The gutter support clips/brackets are then screwed to the fascia using two 30mm screws. A string line and spirit level is used to ensure the gutter has the correct gradient fall and all water flows freely to the pipe outlet.

To prevent the guttering from sagging in later years, the support clips are spaced no greater than 800mm apart.

Water should never “pond” in the gutter. The life expectancy of any guttering is greatly increased when the water runs freely to the outlet.

Read my step-by-step guide to installing plastic guttering here.

Step 5) Guttering

Guttering – more gutter pics can be found in the photo gallery

The Upvc guttering is then inserted into place and all joints are screwed to the fascia with a 30mm screw to prevent any movement. Gutter adapters can be used on the joint with the neighbours guttering (if the profile is different).

The gutter is then tested with water to ensure everything is leak free and working correctly.

At this point in the installation, a new rainwater pipe is usually installed to replace the existing one, connectors/adapters can be used to connect into any existing pipework.

Fed up with blocked gutters? You can read my reviews of gutter leaf guards here.

Step 6) Eaves Felt

Eaves felt – we have many more eaves felt photos in the gallery

Roofing felt rots on the edges that overhang into the guttering, thus we need to install a new product that will last for decades.

Replacement eaves felt “trays” are tucked under the existing roofing felt and overlap into the guttering.

This type of eaves felt is rigid and unlike traditional felt it is designed not to rot or sag. These felt trays are now being used on newly constructed homes as well as refurbishment projects.

As you can see from the photo this product prevents rainwater from splashing up from the gutter onto the fascia boards.

You can even buy eaves felt on Amazon.

Step 7) The Completed Installation

The boards and guttering are now cleaned and a mastic/silicone sealant is applied to the window frames and external walls. This prevents insect infestation and leaves a neat finish.

Here you will find a list of all the materials used in this installation.

Please feel free to explore the many other helpful pages on this site that contain informative guides and photos. This site is frequently updated so bookmark it!



10 Responses to “How to Replace Fascia and Soffits Boards With Plastic Upvc”

  1. Ian King08/01/2012 at 6:04 pm #

    Invaluable site – in conjunction with EuroCell Plastics I have completed the replacement of the whole of the roofline on my property.


  2. Brenda13/03/2012 at 3:29 pm #

    Thank you very much for the information on your website. It has saved me from going with a contractor who told me that there was no need to remove rotten wood!

  3. Peter lawless04/07/2012 at 3:06 pm #

    Thanks for this – given me a little more confidence to attack my bungalow.
    Just a couple of questions:

    How long would you expect it to take for a half decent diyer to do a 7-8 metre stretch.

    Also the tiles I have on my bungalow look like the ones that feature in your pics, what’s the best way to remover, are they Hooke on nailed in etc.


    • ADMIN04/07/2012 at 5:10 pm #


      Not sure how long this would take as it depends on your ability. The boards are 5 metres in length so having two people is alot easier than a single person trying to fit them.

      The tiles are usually hooked over a baton and sometimes nailed to the baton as well, shouldn’t be too much trouble to remove the nails if you nudge up the second course of tiles to reveal the nail.

      This photo shows the second course of tiles nudged up and the baton that the first course are nailed to –

      Hope it helps!

  4. Clare01/09/2012 at 4:19 pm #

    Great website. I have had 2 quotes to replace guttering, fascia etc but there is a difference of £1000 between quotes. Is there a need to remove tiles when putting roofing felt on and if so how many rows?

    • ADMIN01/09/2012 at 5:56 pm #


      I always push up the 2nd row of tiles and completely take off the 1st row, this photo is a good example –

      It would not be possible to install the felt securely without removing the tiles, not to a standard I would find acceptable. Some companies just tuck a small amount of felt under the tiles, but that’s not acceptable and is usually a sign of a bodge job.

      Hope the info helps!

  5. andy16/09/2012 at 12:14 pm #

    Difficult to repair guttering after. Eaves strips are quite stiff and coulnt get to gutter bracket screws! one drawback.

    • ADMIN16/09/2012 at 2:33 pm #

      Agreed, It can be a bit tough bending the eaves felt up to get to the screws but shouldn’t be impossible, not with the felt trays I use as they are a bit bendy. Also the eaves vent I install on top of teh fascia means the gutter bracket isn’t butted up to the eaves felt, so there is some space to get a screwdriver in there as well.

      I offer ten year guarantees with new installations so customers shouldn’t need to get to the screws anyway.

      • Kev17/06/2013 at 1:15 pm #

        Hi Daniel, at some point in the next couple of years i’ll be looking to replace my woodwork with PVC. A couple of questions:- What is your company called? Where abouts in the UK are you? Do you travel far for work? (Suffolk)? Could i labour for you to do mine installation when the time comes (So i can learn and also keep costs down)? When going round a semi-detatched roof corner (3 slopes to roof), i’m guessing that you have to remove the first couple of hip tiles on each corner? Can the job be done with two scaff towers with boards in between towers? (I,m not a builder or a roofer 🙂 ) Interesting website, regards Kev.