Original sash windows are an important architectural element of many period homes. Even though they’re built to last, wooden sash windows can become damaged over time. At Sash Window Experts, we have a team of experienced craftsmen to provide rotten sash window sill repairs and a comprehensive restoration service for the traditional timber sashes in your home.
Over the years, we’ve been fortunate to have worked with many beautiful period sash windows that have stood the test of time – many over 100 years old. Unlike modern uPVC windows that have a limited lifespan, wooden sash windows can easily be repaired and refurbished to keep them working well and looking great for many decades to come.
From joint tearing to glass damage and even timber decay, your original windows can be repaired by craftsmen with the right skillset and experience. Not only does this mean that you can enjoy your period sashes for longer, it also makes them more cost efficient. If you wish to preserve the architectural heritage of your home for the long term, Sash Window Experts should be your first port of call.
What causes rotten window sills?
One of the most common problems with box sash windows is rotten window sills. The sills catch the brunt of the good old British weather and this can lead to rainwater absorption into the window sill which, in turn, can result in rotting sills.
Since the sill is located at the bottom of the window, this is the place where most water gathers. The water causes the paint to flake and crack so that the timber underneath is no longer protected. When water gets into the timber, decay can begin to cultivate.
Your window’s elevation and aspect also play a role. South and southwest facing windows are likely to be most affected by the weather since more sun exposure will crack paint more quickly, which allows moisture to penetrate the window sill.
Similarly, if the exterior paintwork on your traditional sash windows has not been kept in good decorative order, rainwater will slowly soak into the timber. Initially, this will cause the window sill to rot but, left untreated, the moisture can spread further into the lower parts of the box frame and into the lower sash itself, leading to major wet rot problems.
If rotten timber issues continue to remain unaddressed, the rainwater can soak through into the plasterwork beneath, causing further and often extensive damage.
How do you spot signs of window sill decay?
Tell-tale signs of rotten window sills include water marks on the underside of the sash window. Discoloration of the plasterwork on the interior side of the window sill – usually a brown watermark – is a sure sign that rot is setting in.
This indicates an opening between the wooden sill and the window’s masonry sill. While it is possible that bad sealing may be at least in part to blame, water marks are a typically a sign of developed timber decay.
You should inspect the exterior window sill, particularly in the corners where the sill meets the box frame. Prod the timber with a screwdriver – if the wood feels soft, this is a definite sign of a rotting window sill.
Can rotten sash window sills be repaired?
If you suspect timber decay in your sash window sill, call Sash Window Experts on 01483 299587 for professional advice, a free no-obligation survey and quotation. Our experienced carpenters have mastered the art of repairing or installing new sills, guaranteeing a flawless finish to all our work.
Just because one section of the window has become decayed, it doesn’t mean that the full window needs replacing. With the right methods and expertise, an experienced timber craftsman can repair or replace the sash window sill with a new hardwood section.
That way, your window will be given a new, solid foundation, which will be resealed and protected to make sure the problem doesn’t happen again. Depending on the extent of the timber defect, we can even replace the complete sill and the outer lower box assembly to ensure all rot is removed completely and new, well sealed joints are constructed. The box frame thus regains its integrity and strength, leaving no gaps between the sill and the frame that could cause future water ingress problems.
At the end of the sash window sill repair process, you’ll find your period sashes revived and restored to their full function and beauty. We’re proud to say that our sash window repair service has saved literally thousands of windows, prolonging their lifespan when other companies have recommended unnecessary and costly replacement.
With more than 20 years’ experience in restoring, repairing and renovating traditional sash windows for home owners of period buildings in Guildford and all across the South East, Sash Window Experts truly are the experts when it comes to looking after your timber sashes.
For professional advice about rotten sash window sill repairs, please call us today on 01483 299587 to speak to a member of our team, fill out the contact form to arrange for a free, no obligation quotation.