Fascia boards play a vital role in your home’s roofline. Positioned along the edge of the roof where it meets the external walls, they support the bottom row of roof tiles, carry the guttering and provide a neat, finished appearance. Over time, particularly on older properties with timber fascias, these boards can begin to rot, crack or warp, leading to damp issues, pest access points and a deteriorating appearance.

Replacing timber fascias with uPVC is a practical and cost effective home improvement. uPVC fascia boards will not rot, require very little maintenance and provide a clean, long lasting finish. This guide explains the process, from assessing the existing boards to installing new ones.

Why Replace Your Fascia Boards?

Before starting work, it is important to understand why fascia replacement is often recommended. Timber fascia boards were widely used on UK properties for many years, but they are vulnerable to weather exposure. Rain, frost and damp conditions can cause timber to swell, crack and eventually decay. Once this happens, the boards may no longer adequately support the guttering or roof tiles, allowing water to penetrate the roof structure and potentially cause more serious damage.

uPVC fascia boards, by contrast, are resistant to moisture and will not rot, swell or support mould growth. Once installed, they require minimal maintenance beyond occasional cleaning. Replacing timber fascias with uPVC is a long term solution that can enhance the appearance of your property while reducing ongoing upkeep.

Tools and Materials You Will Need

Before beginning, ensure you have all the necessary tools and materials. A typical fascia replacement will require:

uPVC fascia boards, cut to size
uPVC fascia joints and corner sections
Suitable fascia fixings or nails
Replacement gutter clips and brackets, if required
A secure ladder or scaffold tower
Tape measure and pencil
Hand saw or mitre saw
Pry bar or claw hammer for removal
Safety gloves and eye protection

Always ensure that ladders or access equipment are stable and safely positioned before working at height. If you are unsure, consider using a scaffold tower or hiring a professional.

Step 1: Remove the Existing Guttering

To access the fascia boards, the guttering must first be removed. Begin by unscrewing the downpipe brackets and carefully taking down the downpipe sections. Then work along the gutter run, unclipping or unscrewing it from the brackets.

If the existing guttering is still in good condition, set it aside for refitting later. This is also a good opportunity to inspect for any damage, such as cracks or sagging, and replace any worn sections. Dispose of old materials responsibly, as uPVC components can often be recycled.

Step 2: Remove the Old Fascia Boards

With the guttering removed, the fascia boards will be fully accessible. Use a pry bar or claw hammer to carefully remove timber boards from the rafter ends, taking care not to disturb the roof tiles above.

Inspect the exposed rafter ends for any signs of rot or damage. Any compromised timber should be repaired or replaced before installing new fascia boards. Fitting new boards over damaged timber will lead to further problems over time.

Step 3: Prepare and Install the uPVC Fascia Boards

Measure each section accurately, allowing for joints, corners and any angles. Cut the uPVC boards to size using a fine toothed saw on a stable surface.

When installing, allow a small expansion gap at each joint, as uPVC can expand slightly with temperature changes. Joint covers can be used to conceal these gaps while allowing for movement.

Secure the boards to the rafter ends using appropriate fixings, spaced evenly along the length. Check that each board is level before fixing in place. Use purpose made corner pieces at external angles to achieve a clean finish.

Step 4: Refit or Replace the Guttering

Once the fascia boards are in place, the guttering can be refitted or replaced. Position the brackets to create a slight fall towards the downpipe, typically around 1 in 600, to ensure proper drainage.

Secure the guttering into the brackets, reconnect the downpipe and check that all joints are sealed. Run water through the system to confirm there are no leaks and that water flows correctly.

Step 5: Install Soffit Boards if Required

If your property includes soffit boards between the fascia and the wall, this is an ideal time to replace them. uPVC soffits are available in solid, vented and hollow designs to suit different roof structures. Replacing both fascia and soffit together ensures a consistent appearance and avoids additional work later.

When to Call a Professional

Fascia replacement is suitable for a competent and confident DIY enthusiast or an experienced tradesperson. However, working at height involves risk. If you are not comfortable using ladders or access equipment, it is advisable to seek professional assistance. Likewise, if significant structural damage is identified, consult a qualified professional before continuing.

At The Plastic Centre, we supply a comprehensive range of uPVC fascia boards, soffits, bargeboards and all necessary trims and fixings. Whether you are a trade professional or undertaking a DIY project, our team can help you select the right materials for the job.