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Sash Windows Repair and Replacement

Sash windows older than 20 years may have various issues, including draughts and rattles. They could also be poorly insulated. A little attention can often bring them back to a top level of performance.

First, knock off the paint seal from the window stop using a utility knife. Then, remove the staff bead and pull out the upper sash and remove the cords or chains and storing hardware in a labeled bag.

Sealing

Sash windows are beautiful in old buildings, however they require regular maintenance and could be susceptible to issues such as wet rot, cracked putty and draughts. It is possible to reduce energy loss and improve the efficiency of sash windows by replacing or repairing them, or sealing them.

Draughts are mostly caused by gaps between the sash and the frame. They can also cause rattling and reduced sound-proofing. Sealing beads, specialist products and secondary glazing can all be used to reduce the air leakage in the shutter.

A gap between the top or bottom of the sash, and the jamb frame, is an issue that is common. This can lead to moisture leaking into the wood, which can cause rotting and growth of mold. Seal the gap with silicone, polyurethane or foam sealant.

Installing a new sash runner or spring bronze could be necessary when a gap is preventing the windows from opening and shutting easily. These are bronze strips that are stapled or nailed to the edges of the lower sash to stop sideways rattle, and they can be purchased 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 sash runners it is essential to measure the entire width of the window opening. It is recommended to measure from the top of sash up to the horizontal line on the meeting rail and from the bottom of sash down to the sill. These measurements can be transferred to the new runners, which will ensure a perfect fitting and better operation of the window.

In older buildings, the gap between sash and frame is usually larger around the leading edge. It can be draught proofed by a self-adhesive V-strip, but it is essential to account for this when measuring and cutting the material.

The strip should be cut at the height of the sash with an inch added on each side to allow for movement. It should be trimmed squarely and positioned to align with the angle of the sill. Use stainless steel screws as brass will be rusty. Also, make sure to use the highest quality silicone or polyurethane glue.

Refurbishment

The sash is a stunning historical feature of a lot of homes. Yet despite their beauty, windows like sash windows can be prone to a myriad of issues. Common problems include rattling, stuck or draughty windows. Frames that are rotting and rails that connect them, as and broken glazing bars, faulty weights or rotten frames are all causes of problems. When these issues arise, it's time to consider a sash repair or replacement.

Refurbishment may be more expensive than replacing the sash, but it will bring back the appearance and function to the same standard that it was in its original form. It involves re-lining the meeting rail and sash boxes with traditional putty and repairing any rot-related damage. 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). It is also recommended to install brush pile weather strip to minimize the noise of rattling.

If the need for a new sash arises the frame can be constructed from similar designs to the frame of the previous one and preserve the style of your home's historic design. This is particularly crucial for listed buildings, where any modifications to windows need planning permission.

Check the metal tabs of the new window to the old sash prior installing it (see below). If the tabs are different shapes, the new sash won't fit correctly into the slots of the window frame.

When a window is damaged it is crucial to decide between repair or replacement, because each type of work will involve a different level of expertise and price. If a large portion of the glass in the sash is missing replacing it would be an option. However, if the glass is damaged in a small area or a sill has begun damaged, a repair would be the better option.

Replacement

Although many homeowners want to keep their old windows in good order, deterioration can eventually result in problems like rattles, draughts, or even broken glass. This is why replacing sash windows is often the only solution to these issues. There are other methods to improve sash window performance rather than replacing them. They can be improved by installing secondary glazing and draught-proofing.

Think about the scope of the problem. It might not be necessary or suitable to replace a window. A glass that is foggy, for example, is usually caused by the sash, and can be fixed without tearing out the entire frame. It is usually possible to fix a poor seal using a couple of simple solutions, rather than cutting out the entire frame and replacing it.

Sash windows are surprisingly complex in design and feature lots of moving parts. This is why it can be tricky to solve common issues like sash cords that are snapped or broken panes. Many homeowners do not want to take apart the window frame in order to fix the issues. This is why many choose to work with a professional.

Specialists can restore sash window frames to their original glory or make them more up-to-date with the latest energy standards. This could include reconditioning the frames and fitting secondary glazing, to avoid heat loss from the window. It is also possible to put in an extra strip of brush pile to stop rattling, and reduce drafts.

To begin a repair, remove the upvc window repair stops (the moldings that are in front of the lower sash). Next, remove the staff bead, then pull out the lower sash. Take off the chains or cords that are on both sides. Finally, disconnect the sash weights and the bottom of the weight cavity and take them off. Store the hardware in a secure location. Soften any old, Sash Windows Repair hardened putty or filler with a heat gun and scrape it away with the help of a putty knife. Reassemble the window, reconnect the hardware and lubricate the pulley axles by using silicone or Teflon spray. Reinstall the parting bead and install the upper sash.

Repair

The choice to replace or repair a sash window is an important one for homeowners. Modern replacements are beneficial in many ways however, the original features in an older home can provide authenticity and value. They are also cheaper to repair instead of replacing. Inspecting them regularly can help lower the cost of energy. Sash windows are susceptible to rattles, drafts and condensation, and these issues can lead to higher energy bills and damage to the frame and sash.

Sash windows are notoriously difficult to close and open and the standard sliding mechanism can become dislodged from its track or become draughty. Repairing a sash window requires extensive removal of the window frame, so it's best left to the professionals. With the right tools and knowledge, it is possible to fix old windows with sash yourself. Adam shows Jess how to get started:

Remove any security fittings that are behind the lower window sash. Next, take off the staff bead and pull out the bottom sash. Then, take the cords or chains on both sides and knot the ends to stop them from being pulled back into the frame by the attached weights. It's now time to remove the upper sash. Remove the sash stops, a thin vertical strip of wood that is used to hold the sash. Also, take off any hardware that has been painted. The sash should be pulled back to reveal the weight. It is a large iron or lead cylinder, which is tucked away inside a cavity and held by an elastic cord. To stop the sash from 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 rails that connect them. Remove the glazing bars and sash cords. Then using a utility knife, remove any paint from the sash stop. Once the sashes are returned to their original positions, you can attach the stops using nails that are not too large to risk cutting the weight that is balancing.

To reassemble the sash, put the top sash into its track first, then the lower sash. Make sure the sash stoppers are in the correct alignment with the frame, and then reconnect the beads that separate if required. Reattach the sash chains or cords and attach the sash pulleys.