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Sash Windows Repair and Replacement

Older sash windows can be prone to a variety of problems including draughts, rattles and poor insulation. With a little attention they can be repaired to their original performance.

First, scrape off the seal of paint from the window stop using an utility knife. Then, take off the staff bead and remove the upper sash and remove the chains or cords, and then storing the hardware in a labeled bag.

Sealing

Sash windows look gorgeous in old buildings but they do need maintenance and are susceptible to problems like cracks in putty, wet rot and drafts. Sealing, replacement or repair of the windows sash is an effective way to reduce these problems and increase energy efficiency.

The gaps between sash frame are the primary source of drafts. They can also lead to noise reduction and rattle. Various methods can be used to reduce air leaks in windows with sash, including sealing beads, specialist products, and secondary glazing.

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

If a gap is hindering windows from opening and closing easily, it could be necessary to put in new spring bronze or sash runners. These bronze strips are tied or stapled to the sash's lower edges to stop sideways rattling. They can be bought at DIY stores. Tubular weatherstripping also can be used, but it tends to rip and can alter the appearance of your window.

When installing replacement runners for sash, it is important to take full measurements of the window opening. It is best to measure from the top of sash up to the horizontal line on the rail of the meeting and from the bottom sash down to the sill. These measurements can later be transferred to new runners that will ensure the best fit and function of the window.

In older structures the gap between frames and sash is typically larger around the leading edge. It is possible to draught proof with a strip of self-adhesive V-strip, but it is important to consider this when measuring and cutting the material.

A piece of material should be cut to the width of the sash, and with an extra inch to allow for movement. It should be trimmed to a square shape and then positioned in a way that the ends are aligned to the angle of the window sill. It is also important to use stainless steel screws since brass can rust and the best quality polyurethane or silicone adhesive.

Refurbishment

The sash is a beautiful historical feature of a lot of homes. But despite their beauty, windows like sash windows can be prone to a range of issues. Rattling, draughts, sticking or leaking are common issues. And rotting frames and meeting rails, broken glazing bars, or damaged weights could cause a lot of trouble. When these problems occur it's time for a sash repair or replacement.

Refurbishment is more costly than replacing the sash but it will restore your sash's look and function to the same level that it was in its original form. It involves re-lining the meeting rail and sash box using traditional putty and repairing any rot damage. It also includes re-painting the timber frame and re-glazing with 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 put in brush pile weather strips to reduce the rattling and increase insulation.

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

Before you put the new window on, it's best to compare its metal tabs to the tabs on the old sash (see below). If these are different shapes the new sash will not fit properly into the slots of the window frame.

When a window is damaged it is crucial to decide between repair or replacement, since each kind of repair will involve a different level of expertise and expense. For example the case of a sash windows that has a significant piece of glass missing then replacement is 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 shape, but it is inevitable that deterioration will cause problems like rattles or draughts. Broken glass is also a possibility to occur. These issues typically suggest replacement as the only sensible solution. However, there are ways to improve the sash windows beyond just replacing them, such as installing draught proofing as well as secondary glazing.

Take note of the severity of the issue. It might not be necessary or even suitable to replace windows. For example, a foggy glass issue usually occurs within the sash itself and is typically a solution without tearing out the entire frame. It is typically possible to repair a weak seal using a couple of simple fixes, rather than ripping out the entire frame and replacing it.

Sash windows are extremely complex in design and have lots of moving parts. This is why it can be difficult to fix common issues like sash cords that are snapped or broken panes. Many homeowners do not want to remove the window frame to repair these issues. This is why many opt to hire an expert.

Specialists can restore sash window frames back to their original glory or bring them up-to-date with modern energy standards. This could include reconditioning frames and fitting secondary glass to prevent heat from getting out of the window. It can also be helpful to add a brush pile strip to stop rattling, and reduce drafts.

To start a repair project start by removing the window repair stops (the moldings on the front of the lower sash). Next, loosen the staff bead, then take off the lower sash. Take the chains and cords from both sides. Finally take the sashweights out of the bottom cavity of the weight. Keep the hardware in a safe place. Heat gun to soften the old, hardened filler or putty. Scrape it off with the blade of a putty. Reassemble the window, reattach the hardware and lubricate pulley axles with silicone or Teflon spray. Reinstall the parting bead and reinstall upper sash.

Repair

The decision to repair or replace windows with sash is a major one for homeowners. Although modern replacements offer a host of benefits, the original features of a home that was built earlier provide character and value to the property and are usually cheaper to repair than replacing them. Keeping them in good condition can help save on energy costs. Sash windows are vulnerable to rattles, drafts and condensation. These problems can result in increased energy bills and damage to the frame and the sash.

Sash windows are notoriously difficult to open and close as the traditional sliding mechanism may become displaced from its track or draughty. Repairing a sash window involves extensive removal of the frame of the window and is best left to professionals. However, with the right tools and knowledge, it is possible to repair old sash windows yourself. Adam shows Jess the basics:

Making the window come apart starts by removing any security fittings in front of the lower sash. Then, remove the staff bead and remove the bottom sash. Remove the chains and cords from both sides, and knot them in such a way that they won't be pulled back by the attached weights. It's time to remove the upper sash. Take out the sash stops and a thin wood strip that holds the sash. Also, take off any hardware that has been painted. The sash can be pulled back to reveal the balancing weight, which is a heavy lead or iron cylinder enclosed inside a hidden compartment and held by rope. To prevent the sash from falling into the void pierce it with an hammer and then sacrifice the weight.

After the sashes have been removed, clean the jambs and rails that connect them. Remove the glazing bars and cords for the sash. Then, using a utility blade take off any paint that is on the sash stop. When the sashes are back in place, you can reattach the stops using nails that are small enough to prevent puncturing the weight that is balancing.

Reassemble the sash by putting the upper sash first into its track, then the lower sash. Verify that the sash stoppers and the frame are aligned correctly. If needed, reconnect any beads that are parting. Then, reconnect the sash chains or cords and then re-attach the axles of the sash pulleys.