Painting timber windows

When cleaning your timber windows and doors, it’s important to look out for any damage to the paintwork or timber and repair it as soon as possible, to avoid further damage.

All products deteriorate over time and this is particularly true of those that are exposed to the elements. Wind, rain and sunlight – not to mention wind-borne spores and general grime – all contribute to the breakdown and deterioration of all materials.

The performance of timber windows and doors can be protected through a maintenance coating to increase the barrier between the wood and the elements, either when the coating has been damaged, or around every 5 years.

There are various factors that affect the frequency of maintenance cycles, including climate conditions, coating type and window position. Timber whose orientation is North facing and is predominantly sheltered will generally require less maintenance than South facing timber on window sills or beads. Opaque paint finishes will also require less frequent maintenance than stain finishes.

Typical maintenance cycles for different climatic conditions and coating types are illustrated in the table below.

Coating Type Window Position

Moderate Climate:

Non Coastal areas & ground floor

Hard Climate:

Within 1/2 mile of coastline, second floor or above, or on a hillside

Extreme Climate:

High altitude or exposed coastal areas

White or light
coloured paint

Set Back

On Facade

10 Years

8-10 Years

7 Years

5-7 Years

7 Years

4-6 Years

Dark coloured paint
and dark translucents

Set Back

On Facade

6-8 Years

4-6 Years

4-6 Years

4-6 Years

3-4 Years

3-4 Years

Light translucents such as light oak and pine

Set Back

On Facade

3-4 Years

2-3 Years

2-3 Years

2-3 Years

1-2 Years

1-2 Years


Redecorating Technique

Timbawood joinery is factory spray finished or hand painted using Teknos microporous paint system.

To redecorate, a good quality water based, microporous paint such as Teknos should be used.

Before painting, remove any loose coating material from the paintwork and gently abrade with a fine to medium grade sandpaper/foam pad, taking care to sand in the direction of the grain. Frames should not be rubbed down with coarse sand paper. Ensure that any ‘grey’ timber that has been damaged by ultraviolet light is removed back to a clean, bright surface.

Wash down the abraded paintwork to remove any dust, dirt or other contaminants using a mild detergent solution, and rinse with clean water before allowing to thoroughly dry.

For minor flaking/peeling, in DRY weather brush apply a single coat of a suitable maintenance coating (i.e. a water based, microporous exterior grade paint such as Teknos Aquatop 2600), using a long haired synthetic bristle brush to the abraded areas, ensuring any areas of end grain are sufficiently coated, and allow the coating material to dry.

Repeat as necessary to get an even and full coverage, two coats may well be required to build up the coating film sufficiently to achieve an even coating. Allow the first coat to dry for at least 4 hours before lightly sanding the affected area with a fine grade sandpaper/foam pad and repeating coating as above.

For more widespread damage, where moisture has penetrated joints/end grain or cracks have developed in the corner joints of the frame/casing or on the window sill, the damaged areas should be coated with a primer and any open joints filled with Teknos V Joint Sealer or a two part polyurethane filler/hardener. Once dry, rub down to a flush finish before applying one or two coats of Top coat as above.

NB Resin exudation – Resin should be left to dry out and crystallise into a white powder before being brushed away with a semi-rigid nylon/natural bristle brush. Repainting may not be required as resin can often pass through paint coatings without damage.

Timber Windows London

Are you looking to replace your timber windows? At Timbawood we specialise in the finest single and double glazed timber sash windows and casement windows for period properties throughout the ages.

As experts in period, conservation and listed properties, we manufacture and install bespoke timber casement windows, sash windows, French doors, Front doors, bifold doors and internal doors. We can exact-match your existing windows and doors, carefully matching period mouldings, glazing bars and leading, or create unique designs that are sensitive to the character of your property.

We also offer heritage window repair. If the window frames are in good enough condition we can replace the moving sashes or casements only – and can replace single glazed sashes/casements with double glazed. One of our most popular products are double glazed sashes fitted with slimline double glazing, which looks just like single glazing.

If you have any questions about your windows and doors, or you would like a free quote, please get in touch to speak to one of our specialists.