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Sash Windows Repair and Replacement

Sash windows that are older than 20 years can have various issues, including draughts and rattles. They might also be poorly insulation. With a little care, they can be restored to a high level of performance.

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

Sealing

Sash windows look gorgeous in old buildings but they do need maintenance and are susceptible to issues such as wet rot, cracked putty and drafts. Sealing, replacement or repair of the windows in sash is a great method to minimize these issues and increase energy efficiency.

The gaps between sash frame are the primary cause of drafts. They can also trigger noise reduction and rattle. Sealing beads, special products, and secondary glazing can all be used to reduce the air leakage within the Sash.

A common problem is a gap between the top of the sash and the jamb frame, or the bottom of the sill and the sash. This can cause moisture to leak in, rotting wood and growth of mold. The gap can be closed with silicone or polyurethane caulking or foam sealant.

Installing new sash runner or spring bronze could be necessary in the event that a gap blocks the windows from opening and shutting easily. These bronze strips are tied or stapled to the lower sash edges in order to stop sideways rattling. They are available at DIY stores. Tubular vinyl weather-stripping is an alternative option but it can tear, and can affect the appearance of a window.

It is important to determine the size of the window opening prior to installing the replacement sash runner. It is recommended to measure from the top of the sash to the horizontal line of the rail that connects it, and from the bottom of the sash to the sill. These measurements can be incorporated into the new runners, which will ensure a proper fit and a better performance of the window.

In older buildings there is a larger gap between the sash as well as the frame at the leading edge. It is possible to draught proof by using a self-adhesive V-strip, but it is essential to consider this when measuring and cutting the material.

The strip should be cut at the height of the sash and with an inch extra on each side to allow for movement. It should be cut squarely and placed to align with the angle of the sill. It is also important to make use of stainless steel screws because brass is prone to rust, and the best quality polyurethane or silicone adhesive.

Refurbishment

The sash window is an elegant historical feature in many homes. These windows are beautiful but they can also be susceptible to problems. Common issues include rattling stuck or draughty windows. Rotting frames and rails that connect them, as and broken glazing bars, defective frames, or rotten weights are all causes of problems. If these issues occur, it's time for repairs or replacements to your sash.

Refurbishment is more expensive option than simply replacing the sash itself, however, it can improve the appearance and functionality of your sash window to the same or better than its original state. Refurbishment involves the lining of both the meeting rail and the sash box using traditional putty, and repairing any damage caused by the rot. It also involves 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). In addition, it is recommended to install brush pile weather strips in order to minimize the rattling and increase insulation.

If a new sash is needed it can be constructed with the same design to match the frame you have. This will preserve the style and character of your home. This is especially important for listed buildings where any changes to the windows need planning permission.

Compare the metal tabs on the new window to the old sash prior installing it (see below). If they are different shapes the new sash may not fit in the window frame slots.

When a window is damaged it is essential to decide between repair or replacement because each kind of work will require a different level of expertise and cost. If a large portion of the glass in a sash is missing replacing it would be an alternative. But, if the glass is damaged in a small area or a sill is damaged, a repair would be the better option.

Replacement

Many homeowners would like 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. This is why replacing sash windows is often the only solution to these issues. However, there are other ways to improve sash windows, beyond simply replacing them, like installing draught proofing as well as secondary glazing.

It is important to determine the severity of the issue, as it may not be feasible to replace a complete 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 leaky seal can often be corrected with a few simple fixes rather than an expensive full-frame tear-out and replacement.

Sash windows are surprisingly complex in design and have many moving parts. It can be challenging to fix common problems such as broken panes, or snapped sash cable. Solving these issues usually requires removal of the window frame which isn't something that the majority of homeowners would like to tackle themselves. Many homeowners decide to engage a professional for these reasons.

A specialist can assist in restoring windows made of sash to their original splendor, or timber even bring them up to the latest energy standards. This can include reconditioning the frames and fitting secondary double glazing repair, to avoid heat out of the window. It is also possible to put in a brush pile strip, to stop rattling and reduce drafts.

To begin a repair, take off the window stops. (The moldings are in front of the lower glass). Then, loosen the staff and pull out the lower window sash. Remove the cords and chains from both sides. Lastly, remove the sashweights from the bottom cavity of the weight. Keep the hardware in a secure position. Soften any old filler or hardened putty using a heat gun, and scrape it off with a putty knife. Reassemble the window, reattach the hardware and lubricate pulley axles by using silicone or Teflon spray. Install the parting beads and reinstall the upper sash.

Repair

The choice of replacing or repairing windows with sash is an important one for the homeowner. Modern replacements are beneficial in many ways however, the original features in an older home can provide character and value. They are also cheaper to repair instead of replacing. Maintaining them in good shape can help lower energy costs. Sash windows can be prone to drafts and rattles. This could result in higher energy bills and even damage to the frame and the sash.

Sash windows are notoriously difficult to open and close and the standard sliding mechanism may become displaced from its track or become draughty. It is recommended to leave the repair of window sash to a professional since they require extensive removal. With the right tools and experience it is possible to repair old sash windows yourself. Adam shows Jess the basics:

Remove any security fittings behind the lower window doctor sash. Then, you can remove the staff bead. Then, take out the sash at the bottom. Remove the chains and cords from both sides, and knot them in a way that they can't be pulled back by the weights. It's time to remove the upper sash. Remove the sash stops which is a thin vertical wood strip that holds the sash. Also, remove any paint-encrusted hardware. Unscrew the sash to reveal the balancing weight that is a massive iron cylinder that is encased in a hidden cavity and held by rope. To prevent the sash falling into the void, you must pierce it using a nail, and then let the weight go.

After the sashes have been removed clean the jambs and meet rails. Remove the glazing bars and the cords of the sash. Then, using a utility blade take off any paint that is on the sash stop. Reattach the stops after the sashes have been reinstalled. Use nails that are not large enough to puncture the weight of the balancing.

Reassemble the sash by putting the upper sash first on its track, followed by the lower sash. Check that the sash stops and the frame are aligned properly. If needed, reconnect any beads used for parting. Finally, reattach the sash chains or cords and re-install the axles of the sash pulleys.