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Sash Windows Repair and Replacement

Older sash windows may be plagued by a variety of issues, including draughts rattles, and poor insulation. A little care can often restore them to their original performance.

First, scrape off the seal on the paint of the window stop with a utility knife. Remove the staff bead, pull out the upper sash and remove any cords or chains. Keep the hardware in a bag that has an identification label.

Sealing

Sash windows are beautiful in older buildings, but they require care. They are susceptible to problems like wet-rot cracked putty and draughts. Sealing, replacement or repair of the windows in sash is a great method to minimize these issues and improve energy efficiency.

Draughts are mainly caused by gaps between the sash and frame. They can also trigger rattles and reduce sound-proofing. Sealing beads, specialist products and secondary glazing can all be used to reduce the air leakage inside the sash.

A gap between the top or bottom of the sash and the jamb frame is a common problem. This can cause moisture leaking in the wood, rotting and the growth of mould. Seal the gaps with silicone, polyurethane, or foam sealant.

If a gap is hindering the windows from closing and opening easily, it could be necessary to install new spring bronze or sash runners. These strips of bronze are tied or stapled to the lower sash edges in order to prevent the rattling of the sides. They can be bought at DIY stores. Tubular vinyl weather-stripping is an alternative option, but it is prone to tear and affect the appearance of windows.

When installing replacement sash runners, it is important to measure the upvc window repairs opening. It is recommended to take measurements from the top of sash up to the horizontal centerline on the rail of the meeting and from the bottom of sash down to the sill. These measurements can be incorporated into the new runners, which will ensure a proper fitting and better operation of the window.

In older buildings, there is a wider gap between the sash and frame at the leading edge. It is possible to draught-proof it using a strip of V-strip which is self-adhesive. However, it is important to take this into account when measuring and cutting the material.

The strip should be cut at the top of the sash and with an inch extra on each side to allow for movement. It should be cut to a square shape and then positioned so that the ends are aligned to the angle of the window sill. Make sure to use stainless steel screws since brass will rust. Also, make sure you use a high quality silicone or polyurethane glue.

Refurbishment

The sash is a stunning historical feature of a lot of homes. These windows are beautiful however they are prone to problems. The most frequent issues are rattling, stuck or draughty windows. Rotting frames and rails that meet, as well as broken glazing bars, faulty weights or rotten frames are all causes of problems. If these issues occur, it's time to consider a sash repair or replacement.

Refurbishment can be a more costly alternative than replacing the sash itself, however, it can bring back the appearance and function of your sash window as good, if not superior to its original state. It involves lining the joining rail and sash box with traditional putty and repairing any damage caused by rot. Re-painting the frame of the timber is also included, as is glazing using traditional glass. A full refurbishment can also include adding draught proofing, re-attaching the sash furniture/ironmongery and replacing the parting bead (the dividing strip between the two panes of glass). Finally, it's recommended to fit brush pile weather strips in order to minimize the rattling and increase insulation.

If a replacement sash is required, it can be made using the same style to match your existing frame. This will help preserve the heritage style of your house. This is particularly important for listed properties where any changes to windows will require planning permission.

Before you put the new window on, it's best to compare its metal tabs to those on the sash that was previously used (see below). If these are different shapes the new sash won't fit correctly into the window frame slots.

If a window has been damaged, it is crucial to decide between repair or replacement, because each kind of work will involve a different level of expertise and cost. For example the case of a sash windows that has a large piece of glass that is missing, then a replacement will be the best choice. But when the glass has been damaged in a small area or a sill is rotting then a repair will be more appropriate.

Replacement

Many homeowners wish to keep their old sash window in good condition, however the deterioration of the window will eventually cause issues such as rattles or draughts. Broken glass is also a possibility to occur. These issues typically lead to a replacement as the only feasible solution. There are other options to improve the performance of sash windows rather than replacing them. These include installing secondary glazing and draughtproofing.

Consider the extent of the problem. It may not be necessary or suitable to replace the window. A foggy glass problem for instance, is usually caused by the sash and can be addressed without having to tear out the entire frame. A poor seal can also be fixed with a few simple fixes rather than an expensive full-frame tear-out and replacement.

Sash windows have a complex design that has many moving parts. It can be challenging to fix common problems like broken panes or snapped sash cable. Solving these issues usually requires dismantling the window frame, which isn't something most homeowners would want to tackle on their own. Because of this, many homeowners choose to work with a specialist.

Specialists can restore sash window frames back to their original glory or bring them up-to-date with the latest energy standards. This can include reconditioning the frames and installing secondary glazing, which will stop heat loss through the double glazed window repairs. You can also install a brush-pile strip to reduce drafts and stop the window from rattling.

To begin a repair project, remove the window stops (the moldings on the front of the lower sash). Then, loosen the staff bead, then remove the lower sash. Remove the chains or cords on both sides. Then, remove the sash weights from bottom of the weight cavity and remove them. Keep the hardware in a safe position. The heat gun will soften hardened filler or putty. Scrape it away with the blade of a putty. Reassemble the window. Reattach the hardware. Lubricate the pulleys with Teflon or silicone spray. Install the parting beads and reinstall upper sash.

Repair

It is essential for the homeowner to make a choice on whether to repair or replace their sash windows. Although modern replacements offer many advantages, the original features of an older house add authenticity and value to the property and are usually cheaper to repair than replacing them. Maintaining them in good condition can also reduce energy costs. Sash windows are vulnerable to rattles, drafts and condensation, and these issues can lead to higher energy bills and damage to the frame and the sash.

Sash windows are notoriously difficult to close and open and the standard sliding mechanism may become displaced from its track or become draughty. Repairing a sash window involves extensive removal of the window frame, so it's best left to a professional. But, with the right tools and knowledge, it is possible to fix old sash windows yourself. Adam shows Jess the basics:

Remove any security fittings behind the lower window sash. Next, take off the staff bead, then remove the bottom sash. Then, take the chains or cords on both sides and tie them to prevent them being pulled back into the frame by the weights that are attached. It's time to remove the upper sash. Remove the sash stops which is a thin vertical strip of wood that holds the sash. Also, take off any paint-encrusted hardware. Unscrew the sash to reveal the balancing weight, which is a heavy iron cylinder or lead that is enclosed in a hidden cavity and secured by rope. To stop the sash from falling into the void pierce it using a nail, and sacrifice the weight.

Once the sashes are free, clean out the jamb and rails that meet, remove the glazing cords and sash bars, and remove any paint from the sash stops using an utility knife. Reattach the stops once the sashes are reinstalled. Use nails that are not large enough to puncture the weight of the balancing.

Reassemble the sash by putting the upper sash on top of its track, then the lower sash. Make sure the sash stoppers are in the correct alignment with the frame, and then reconnect the beads for parting if necessary. Reattach the sash cords or chains and install the sash pulleys.