Sash Windows Repair and Replacement

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

First, remove the seal of paint from the window stop using a utility knife. Remove the staff bead, pull out the upper sash and take out any chains or cords. Keep the hardware in a bag with the label.

Sealing

Sash windows can look stunning in older 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 in sash is a great method to eliminate these issues and improve the efficiency of energy.

Draughts are usually caused by gaps between the sash and the frame. They can also lead to noise reduction and rattling. Different methods can be employed to stop air leaks from a sash window, including sealing beads, special products and secondary glazing.

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

If a gap is preventing windows from opening and closing smoothly, it may be necessary to replace sash runners or spring bronze. These bronze strips are stapled or nailed to the lower sash edges to stop the rattling of the sides. They can be purchased at DIY stores. Tubular vinyl weather-stripping is another option but it can rip, and it can detract from the appearance of windows.

When installing replacement sash runners it is essential to measure the entire width of the window opening. It is recommended to take measurements from the top of the sash up to the horizontal centerline of the rail that connects them and from the bottom of sash down to the sill. These measurements can be transferred to new runners which will ensure a better fit and operation of the window.

In older buildings there is a greater gap between the sash as well as the frame around the leading edge. It can be draught-proofed using a strip of V-strip which is self-adhesive. However it is essential to take this into account when measuring and cutting the material.

A strip must be cut to the height of the sash. There should be an additional inch on each side 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. It is also essential to use stainless steel screws, as brass can rust, and a high-quality silicone or polyurethane adhesive.

Refurbishment

The Sash window is a beautiful historical feature in many homes. These windows are gorgeous, but they can be susceptible to issues. Rattling, draughts, sticking or leaking are typical issues. Frames that are rotting and rails that connect them, as along with broken glazing bars, faulty frames or weights that are rotten can all cause problems. When these problems occur it's time to consider repairs or replacements to your sash.

Refurbishment may be more expensive than replacing the sash, however, it can bring back the appearance and function to the same level that it was in its original form. Refurbishment involves lining the meeting rail as well as the sash box with traditional putty, and repairing any damage caused by the rot. 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). It's also recommended to install brush pile weather strip to prevent rattling.

If a new sash is needed, it can be made using the same style to match your existing frame. This will preserve the style and character of your house. This is especially crucial for listed homes where any changes made to windows will require planning permission.

Before putting the new window repair in place It is recommended to check the metal tabs against the tabs on the old sash (see below). If these are different shapes the new sash will not fit in the window frame slots.

It is crucial to determine whether to replace or repair a damaged window, as each choice will require a different degree and cost of expertise. If a significant portion of the glass in a sash is missing then replacing it will be the better alternative. But when the glass has been damaged in one small section or a sill is damaged, a repair would be more appropriate.

Replacement

While a lot of homeowners are eager to keep their old sash windows in good working order, deterioration can eventually cause issues such as draughts, rattles, or even broken glass. This is why it's often the only solution to these issues. But there are ways to improve the sash windows beyond just replacing them, including installing draught proofing as well as secondary glazing.

It is crucial to assess the extent of a problem, as it may not be feasible to replace the entire window. A foggy glass problem for instance is typically caused by the sash and can be fixed without tearing out the entire frame. A poor seal can also often be remedied with a few simple fixes instead of a costly full frame tear-out and replacement.

Sash windows feature a complicated design that has many moving parts. This is why it can be a challenge to remedy some common problems such as snapped sash cords or broken panes. The solution to these issues typically involves dismantling the window frame, which isn't something that most homeowners want to take on themselves. Many homeowners choose to work with a professional due to these reasons.

A professional can help restore windows made of sash to their original splendor or even bring them up to modern energy standards. This could include reconditioning the frames and installing secondary glazing to stop heat out of the window. You can also add a brush-pile strip in order to minimize drafts and prevent the window from rattling.

To start a repair project, remove the window stops (the moldings in front of the lower sash). Next, remove the staff bead and take off the lower sash. Remove the cords or chains on both sides. Then, remove the sash weights from the bottom of the weight cavity and remove them. Keep the hardware in a secure place. Soften any old filler, hardened putty, or filler by using a hot gun. Then scrape it away using the help of a putty knife. Reassemble the window. Reattach the hardware. Lubricate the pulleys using Teflon or silicone spray. Install the parting beads and reinstall the upper part of the sash.

Repair

The decision to repair or replace windows with sash is a crucial one for the homeowner. While modern replacements provide numerous benefits however, the original features of an older home add character and value to the property and are usually cheaper to repair than replacing them. Maintaining them in good condition can help save on energy costs. Sash windows can be susceptible to rattles and drafts. This could result in more expensive energy bills and can damage the frame and sash.

Sash windows are notoriously difficult to open and close, and the traditional sliding mechanism can become dislodged from its track or become draughty. Repairing a sash window involves extensive dismantling of the frame of the window, so it's best left to the professionals. With the right tools and skills, it is possible for you to repair the old sash window yourself. Adam shows Jess how to get started:

Remove any security fittings behind the lower window sash. Then, remove the staff bead. Finally, pull out the sash at the bottom. Take the chains and cords from both sides, and knot them in a way that they can't be pulled back by the weights attached. It's time to remove the upper sash. Take out the sash stops and a thin wood strip that holds the sash. Also, remove any paint-encrusted hardware. Unscrew the sash to reveal the balancing weight, which is a heavy iron cylinder that is encased in a hidden cavity and held by rope. To prevent the sash from falling into the void, hit it with an hammer and then sacrifice the weight.

After the sashes are removed clean the jambs and rails that connect them. Remove the glazing bars and sash cords. Then, using a utility blade take off any paint from the sash stop. Once the sashes are back in place, you can reattach the stops using nails that are not too large to risk cutting the weight that is balancing.

To reassemble the sash place the top sash onto its track first, and then the lower sash. Make sure the sash stoppers are properly aligned with the frame, and then reconnect the parting beads if needed. Then, reconnect the sash cords or chains and then re-attach the axles for the sash pulleys.