Winter is the most demanding season for sash windows. Low temperatures, damp weather and limited ventilation place continuous stress on timber, raising the risk of swelling, condensation and decay.
Homes across Sussex, particularly those close to the sea, face increased exposure to salty coastal air, which accelerates deterioration.
Drawing on experience from ABC Carpentry and Joinery, which specialises in traditional sash restoration in Brighton, the following five top tips show how homeowners in Sussex can protect their windows during the colder months.
Choose durable timber that withstands winter moisture
Timber quality significantly impacts a window’s lifespan. Softwood is an inexpensive option, but it absorbs moisture easily and decays faster under winter conditions.
Hardwoods such as utile offer greater density and weather resistance, especially in coastal environments. Accoya is another strong option thanks to its vinegar-based treatment, which helps prevent mould from forming inside the grain.
Keep external paintwork intact
Paint is the first line of defence between timber and the elements. Any flaking, cracking or exposed edges allow water to penetrate, especially during wet winter spells.
Pay close attention to the top and bottom edges of each sash where wear appears first. A well-maintained paint system reduces water absorption and slows the development of rot.
Reduce condensation during cold periods
Condensation becomes more noticeable in winter due to the contrast between warm indoor air and cold glass. Left sitting on the timber, it accelerates deterioration.
Wiping windows each morning or opening the sashes slightly for short periods improves airflow and reduces moisture build up. The average person produces around half a pint of water vapour overnight, which is why internal condensation is so common at this time of year.
Double glazing helps, but ventilation is still important.
Check for early signs of rot. A brief winter inspection can prevent minor issues from becoming costly repairs. Look for soft patches, discolouration or flaking wood along the lower rail and sill corners where water collects.
Early treatment prevents decay from spreading deeper into the structure. This is particularly valuable for older Sussex properties where original box sashes are still in use.
Repair problems rather than waiting for spring
Sticking sashes, draughts, or visible deterioration should not be ignored during winter. Cold, damp conditions only worsen existing issues.
Servicing or repairing the affected areas protects the integrity of the timber and improves heat retention within the home. Addressing problems early avoids more extensive work later.