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Sash Windows Repair and Replacement
Sash windows that are older than 20 years can have many issues, including draughts and rattles. They could also be inefficiently insulated. A little attention can often bring them back to a top level of performance.
First, take off the paint seal using an utility knife. Remove the staff bead, then pull out the upper sash, and remove any cords or chains. Store the hardware in a bag with a label.
Sealing
Sash windows can look stunning in older buildings, but they require maintenance and could be susceptible to issues such as cracks in putty, wet rot and drafts. Repair, sealing, or replacement of the windows sash is an effective method to minimize these issues and improve energy efficiency.
Draughts are mostly caused by gaps between the sash and frame. They can also trigger noise and rattling, which can reduce soundproofing. Sealing beads, special products, and secondary glazing may all be used to reduce the air leakage in a Sash.
A gap between the top and bottom of the sash and the jamb frame is an issue that is common. This can result in water leaking into the wood, rotting of the wood and the growth of mould. Seal the gaps with silicone, polyurethane, or foam sealant.
If a gap in the window is preventing windows from closing and opening smoothly, it may be necessary to replace spring bronze or sash runners. These bronze strips are attached by staples or nails to the lower sash edges in order to prevent the rattling of the sides. They are available at DIY stores. Tubular vinyl weatherstripping can also be used, however it is more likely to tear and may alter the look of your window.
When installing replacement sash runners it is essential to take full measurements of the window opening. It is best to measure from the top of the sash up to the horizontal centerline of the meeting rail and from the bottom sash down to the sill. These measurements can be transferred to new runners, which will ensure the best fit and function of the window.
In older buildings there is a greater gap between the sash and frame at the leading edge. It can be draught proofed by using a self-adhesive V-strips, but it is important to take this into consideration when cutting and measuring the material.
A piece of material should be cut to the height of the sash, with an extra inch to allow movement. It should be cut square and positioned in a way that the ends are aligned to the angle of the window sill. It is also crucial to use stainless steel screws as brass can rust, and high-quality polyurethane or silicone adhesive.
Refurbishment
The Sash window is a beautiful and historic feature of many homes. But despite their beauty, windows like sash windows can be prone to a range of issues. Common issues include rattling draughts or sticking. And rotting frames and connecting rails, broken glazing bars or faulty weights can create a mess. If you experience any of these issues it's time to replace or repair your sash.
Refurbishment is more expensive option than simply replacing the sash itself, but it can bring back the appearance and function of your sash window as good, if not superior to its original state. It involves re-lining the meeting rail and sash box with traditional putty and fixing any rot-related damage. It also includes re-painting the frame of timber 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 put in brush pile weather strips in order to minimize the rattling and increase insulation.
If a new sash is required, it can be made using the same style to match your old frame. This will preserve the style and character of your home. This is particularly important for buildings that are listed, as any modifications to windows need planning permission.
Before you put the new window in before installing it, make sure you check the metal tabs against those on the sash that was previously used (see below). If they're different shapes, the new sash won't fit properly into the window frame slots.
It is important to decide if you want to repair or replace a damaged window, as each choice will require a different degree and level of expertise. If a large part of the glass in the sash is missing replacing it would be a better alternative. But in the event that the glass is damaged in a tiny section or a sill has been decaying, a repair may be the better option.
Replacement
Many homeowners wish to keep their old sash windows in good condition, however deterioration will eventually cause problems such as rattles or draughts. Broken glass can also occur. These issues typically point to an inevitable replacement as the only sensible solution. However, there are other ways to improve sash windows beyond just replacing them, such as installing draught proofing as well as secondary glazing.
Consider the extent of the issue. It may not be necessary or appropriate to replace the window. For instance, a fogging glass issue typically occurs in the sash itself and can usually be solved without tearing out the entire frame. It is often possible to fix a weak seal by making a few easy fixes, rather than tearing out the entire frame and replacing it.
window repairs are quite complex in design and feature a lot of moving parts. It can be challenging to fix 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 that most homeowners would want to tackle themselves. This is why many opt to hire a specialist.
Specialists can restore sash window frames back to their original glory or make them more up-to-date with the latest energy standards. This may include reconditioning the frames and fitting secondary glass to stop heat from getting out of the window. It is also possible to add a brush-pile strip in order to minimize drafts and prevent the window from squealing.
To begin a repair, remove the window stops. (The moldings are on the side of the lower glass). Then, loosen the staff bead and pull out the lower sash. Remove the chains and cords from both sides. Then, remove the sashweights from the bottom weight cavity. Keep the hardware in a safe location. Use a heat gun to soften hardened filler or putty. Scrape it off using a blade made of putty. Reassemble the window, reconnect the hardware and lubricate pulley axles using silicone or Teflon spray. Reinstall the parting beads and then reinstall the upper sash.
Repair
The decision to repair or replace a sash window is an important one for homeowners. Modern replacements have many benefits, but the original features in an older home can provide authenticity and value. They are also cheaper to repair instead of replacing. Maintaining them in good condition can help lower the energy cost. Sash windows are susceptible to rattles, drafts, and condensation. These problems can lead to increased costs for energy and damage to the frame and sash.
Sash windows are notoriously difficult to open and close and the standard sliding mechanism can become dislodged from its track, or even draughty. It's best to leave the repair of window sash to a professional because they require extensive removal. With the right tools and skills it is possible to repair an the sash window that is old. Adam shows Jess the basics:
Getting the window to come apart begins with the removal of any security fittings on the front of the lower sash. Then, you can remove the staff bead. Then, remove the sash at the bottom. Then, take the chains or cords on both sides, and tie the ends to stop them from being pulled back into the frame by the weights attached to them. It's now time to remove the upper sash. Take out the sash stops which is a thin vertical wood strip that holds the sash. Also, remove any painted-covered hardware. Pull the sash back to reveal the weight. It is a massive iron or lead cylinder, which is tucked away in a cavity and is supported by cords. To stop the sash falling into the void make a hole in it using nails and remove the weight.
When the sashes are untied Clean the jamb and meet rails. remove the glazing cords and sash bars, and scrape off any paint off the sash stops with a utility knife. When the sashes are returned to their original positions, you can attach the stops using nails that are small enough to prevent puncturing the weight that is balancing.
Reassemble the sash by inserting the upper sash first on its track, then the lower sash. Verify that the sash stoppers and the frame are aligned correctly. If necessary, reattach any beads that are parting. Then, reconnect the sash chains or cords and re-install the sash pulley axles.