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Sash Windows Repair and Replacement

Sash windows that are older than 20 years may have various issues such as rattles and draughts. They might also be inefficiently constructed to be insulated. With a little effort they can be repaired to a high level of performance.

First, scrape off the paint seal from the window stop with a utility knife. Remove the staff bead, then pull out the upper sash and remove any cords or chains. The hardware should be stored in a bag with the label.

Sealing

Sash windows are beautiful in old buildings but they require maintenance and are susceptible to problems like cracks in putty, wet rot, and draughts. Sealing, replacement or repair of the sash window is an effective method to minimize these issues and increase energy efficiency.

The gaps between sash frame are the primary source of drafts. They can also lead to noise reduction and rattling. Different methods can be employed to limit air leaks within a sash window, including sealing beads, specialty products and secondary glazing.

A common problem is a gap that exists between the top of the sash and the jamb frame, or between the bottom of sash and the sill. This can lead to water leaking into the wood and rotting of the wood, and mould growth. The gap can be sealed with silicone or polyurethane caulking or foam sealant.

If a gap is preventing windows from opening and closing without a hitch, it might be necessary to put in new spring bronze or sash runners. These strips of bronze are stapled or nailed to the sash's lower edges to stop the rattling of the sides. They can be bought at DIY stores. Tubular vinyl weather-stripping is an alternative option however it can tear, and can make a difference to the appearance of windows.

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

In older buildings there is a greater gap between the sash as well as the frame around the leading edge. It is possible to draught-proof it using strips of V-strip that is self-adhesive. However it is essential to consider this when cutting and measuring material.

A piece of material should be cut to the height of the sash, with an extra inch on each side for movement. It should be cut squarely and positioned in accordance with the angle of the sill. Use stainless steel screws since brass may get rusty. Also, use high-quality silicone or polyurethane glue.

Refurbishment

The sash is an attractive, historical feature of many homes. Yet despite their beauty, these windows are prone to a myriad of issues. Common issues include rattling stuck or draughty windows. And rotting frames and sash windows repair meeting rails, broken glazing bars, or damaged weights could cause a lot of trouble. If you experience any of these issues it's time to replace or repair your sash.

Refurbishment can be a more costly option than simply replacing the sash itself but it can bring back the appearance and function of your sash window to as good if not better than its original state. It involves re-lining the meeting rail and sash boxes with traditional putty and repairing any damage caused by rot. Re-painting of the timber frame is also included, as well as the re-glazing process 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 the need for a new sash arises, it can be made using 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 homes where any changes to the windows will require planning permission.

Compare the metal tabs of the new window with those of the old sash prior installing it (see below). If they're different sizes, the new sash will not fit inside the window frame slots.

It is important to decide if you want to replace or repair the damaged window, since each choice will require a different level and cost of expertise. If a large part of the glass in the sash is missing then replacing it will be an option. If the glass is only damaged in a small region or a sill has begun to decay, then a repair would be better.

Replacement

While many homeowners are keen to keep their old windows in good order, deterioration can eventually cause issues such as rattles, draughts or even broken glass. These issues often lead to a replacement as the only logical solution. There are other methods to improve the performance of sash windows than simply replacing them. These include installing secondary glazing and draughtproofing.

Think about the scope of the issue. It might not be necessary or appropriate to replace the window. Foggy glass for instance is typically caused by the sash, and can be fixed without tearing out the entire frame. A weak seal can often be remedied by a few easy fixes instead of a costly full-frame tear-out and replacement.

Sash windows are extremely complex in design and have many moving parts. It can be challenging to fix some common problems like broken panes or sash cables that have snapped. Resolving these issues often requires removal of the window frame which isn't something most homeowners would want to tackle on their own. Many homeowners opt to engage a professional for these reasons.

A professional can help restore windows made of sash to their original splendor, or even bring them up to the latest energy standards. This could include reconditioning the frames and installing secondary glazing, which will stop heat escaping out of the window. It is also possible to add a brush pile strip to stop rattling, and reduce drafts.

To begin the repair, take off the window stops. (The moldings that are located in front of the lower glass). Next, loosen the staff bead, then pull out the lower sash. Remove the chains and cords from both sides. Lastly take the sashweights out of the bottom weight cavity. Store the hardware in a safe location. Soften any old filler, hardened putty, or filler with a heat gun and scrape it off with the help of a putty knife. Reassemble the window, attach the hardware and lubricate the pulley axles using silicone or Teflon spray. Install the parting beads again and reinstall the upper sash.

Repair

It is essential for the homeowner to decide whether to repair or replace their sash windows. Although modern replacements offer a host of benefits, the original features of an older house add character and value to the home and are usually cheaper to repair than replacing them. Inspecting them regularly can also lower energy costs. Sash windows are vulnerable to rattles, drafts, and condensation, and these problems can lead to increased energy bills and damage to the frame and the sash.

Sash windows can be a challenge to open or close. The sliding mechanism may become sloppy or even draughty. Repairing a sash window requires extensive dismantling of the frame of the window, so it's best left to the professionals. With the right tools and experience it's possible to repair an the old sash window yourself. Adam shows Jess how to begin:

Getting the window repairman to come apart begins 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 a way that they can't be pulled back 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) and then loosen any paint-encrusted hardware. Pull the sash to reveal the balancing weight, which is a large iron cylinder or lead that is enclosed in a concealed cavity and held by rope. To prevent the sash falling into the void, you must pierce it with a nail and sacrifice the weight.

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

Reassemble the sash by inserting the upper sash first on its track, then the lower sash. Make sure the sash stoppers are aligned properly with the frame, and then reconnect the beads that separate if required. Finally, reattach the sash chain or cords and then re-attach the axles of the sash pulleys.