How to replace fascia and soffit boards

Inspired by Skill Builder. This guide is based on the detailed walkthrough "How To Install Fascia & Soffits", a collaboration between Eurocell and the Skill Builder channel. The video covers the full replacement sequence from stripping old gutters to fitting vented soffit boards — useful to watch in full before you start, as the order of operations matters quite a bit on this job.

1. Work safely at height

Fascia and soffit work means working at eaves height — typically four to six metres on a two-storey house. A scaffold tower hired for the weekend is far safer than a ladder for this job. You need both hands free to handle lengths of uPVC and a drill, and leaning across from a ladder is exactly the kind of thing that ends badly.

Tell someone you are working at height. It sounds obvious. People forget.

2. Remove guttering and existing boards

Start by disconnecting and removing the guttering — this is your chance to check it for cracks and replace any damaged sections while everything is apart. Guttering is cheaper to replace when you already have access than when you have to erect the tower again later.

Prise off the old fascia boards carefully. They may be nailed or screwed to the rafter feet. Old timber fascias sometimes come away in pieces, particularly if they have been painted over many times. Have someone below to catch anything that falls.

3. Check the rafter feet

With the old boards off, inspect each rafter foot for rot. Probe with a screwdriver — sound timber will resist, rotted timber will not. Any soft or spongy rafter feet need cutting back to sound wood and spliced with new treated timber before you fix anything to them.

This is the stage most people are tempted to rush past. It is also the stage that determines whether the new boards last twenty years or five.

4. Fit the new fascia boards

uPVC fascia boards clip or screw to the rafter feet. Start at one end and work along, using the manufacturer’s recommended fixing centres — typically every 600 mm. Join lengths with snap-fit joiners rather than cutting tight butts, which allows for thermal movement.

Keep a spirit level handy and check the fascia is level as you go. The guttering will sit on it, and a fascia that drops at one end will pool water rather than drain it. Not ideal.

5. Fit the soffit boards and ventilation

Soffits slot into a channel on the underside of the fascia and are supported at the wall end by a J-trim or F-trim fixed to the wall. If the existing loft has no other ventilation, use vented soffit boards — they have a series of slots that allow airflow into the roof void and prevent condensation.

Measure and cut each soffit panel carefully. A fine-toothed saw or an angle grinder with a cutting disc gives cleaner cuts in uPVC than a regular wood saw. Wear eye protection — uPVC shavings are sharp and unpleasant.

6. Refit the guttering

New guttering clips to fascia board brackets, which you fix at the correct fall toward the downpipe — 1 in 600 is the standard minimum, so about 5 mm per metre. Snap the gutter sections together, fit the stop ends, and connect the downpipe before you test with a bucket of water.

Check every joint is seated properly. A dripping gutter joint after a wet winter is one of the more predictable bits of property maintenance you will ever deal with, and it is easily avoided at fitting stage.

When to call a handyman

Call Richard if the job is at the front of the house and affects the streetscape, if any rafter feet need structural attention, or if the idea of working at height for a full day does not appeal. This is a very doable DIY project for the right person on a single-storey extension or garage — less so on a full two-storey run.