How to paint fascia boards

Video by inexteriors TV. This walk-through is based on the video “How to Paint Fascia Boards and Soffits | Step-by-Step Exterior Painting Tutorial.” from inexteriors TV, a practical UK decorating channel focused on making exterior decorating achievable for homeowners. The prep sequence in particular is worth watching before you open a tin — it shows clearly why rushing that stage is what causes early peeling.

1. Pick a suitable dry spell and check the boards first

Painting outside needs decent weather — dry, reasonably warm, and not too windy. Aim for temperatures above 10°C and avoid painting in direct strong sunlight, which causes the paint to skin over too quickly before it has properly bonded. In East Kent, late spring and early autumn tend to give the most reliable painting windows. A week of dry forecast is ideal; three dry days is the realistic minimum.

Before you get the ladder out, have a proper look at the boards from ground level first. Poke any soft-looking sections with a screwdriver. Rotten timber will not hold paint no matter how many coats you put on — it needs to be repaired or replaced before any painting starts. There is no point spending a weekend painting boards that are going to fail within a year.

2. Clean the surface thoroughly

Fascia boards collect algae, mould, bird droppings, and a fine layer of grime that paint will not stick to. Scrub them down with a stiff brush and a bucket of warm water with a small amount of sugar soap or exterior cleaner added. Work along the board from one end to the other, then rinse with clean water and let them dry completely — at least 24 hours in warm weather, longer if it is cool or damp.

If there is heavy green algae or black mould, a diluted bleach solution (one part bleach to four parts water) will kill it off properly. Rinse well afterwards. Skipping this step and painting straight over algae is a common mistake — the spores remain active and the new paint will bubble and flake within months.

3. Scrape off loose paint and sand the surface

Any paint that is already flaking or lifting needs to come off before you add more. Use a hook scraper or a paint scraper to remove loose material, then feather the edges of the remaining sound paint with 80–100 grit sandpaper so there is no sharp step between painted and bare wood. Sand any remaining sound painted areas lightly with 120 grit to give the new coat something to key into.

If you end up with a lot of bare wood after scraping — perhaps a quarter of the board or more — consider whether the old paint system is worth keeping at all. Sometimes it is cleaner to strip back to bare timber and start fresh. Mind you, on a full run of fascias that can become a serious day’s work, so be realistic about what you are taking on.

4. Fill cracks and treat bare timber

Small cracks, nail holes, and minor surface splits should be filled with an exterior-grade flexible wood filler. Do not use interior filler on outside work — it absorbs moisture and falls out in the first frost. Press the filler in firmly, allow it to harden fully, then sand it flush. For deeper splits, two thinner applications with drying time between them will give a better result than one thick lump that skins over on top while still soft underneath.

Any bare wood — whether it was already bare or you have just exposed it through filling and sanding — needs a coat of exterior wood primer before the topcoat. A knotting solution on any visible resin-bleeding knots first, then primer over the top. This is what stops the resin staining through your white gloss six months later. Allow the primer to dry fully according to the tin.

5. Apply undercoat then topcoat

A coat of exterior undercoat over the whole board, primed areas and all, gives the topcoat a consistent base and builds up the paint film thickness. Use a 50–65 mm brush and work along the grain, laying off with light strokes at the end of each section. Cut in carefully around the gutter brackets rather than trying to remove them — it is quicker and the finish is usually neater.

Once the undercoat is dry and sanded lightly with 180 grit, apply two coats of a quality exterior gloss or satin in your chosen colour, allowing full drying time between coats. Work from the highest point (soffits first if you are doing those too, then fascia) so any drips land on unpainted surfaces. Two thinner coats will always outlast one thick coat — thick coats sag, trap solvents, and crack as the wood moves seasonally.

6. Work safely on a ladder

Painting fascia boards means working at height, which is probably the most important thing to get right on this job. Use a good-quality extending ladder long enough to reach the roofline without stretching. The feet should be on firm, level ground — a ladder on soft Kent clay after rain can shift without warning. Always have the ladder at the correct angle, roughly one unit out for every four units up.

A ladder standoff bracket is worth investing in if you are doing a full house. It holds the ladder away from the guttering so you are not putting weight on plastic gutters that may be brittle after years of UV exposure, and it gives you a better working position. Never over-reach — move the ladder. It adds a few minutes but it significantly reduces the chance of a fall. That said, if the roofline is more than about four metres and you are not confident working at height, this is a job better handed to someone who does it regularly.

When to call a handyman

Call Richard if you have discovered rotten sections that need cutting out and splicing, if the boards are too high or awkwardly placed for a domestic ladder to reach safely, or if you simply want the whole job done in a day without the fuss of sourcing materials and setting up scaffolding. Painting a full run of fascia on a semi-detached in Sandwich typically takes the better part of a day and involves a fair amount of up-and-down ladder work — a second pair of hands or an experienced decorator makes a real difference.