Stop a sash window rattling

Find where a sash window rattles, then adjust the beads, seals and catch to fix it in an afternoon.

SW-01Work out where the rattle is coming fromOpen the window a little and gently rock each sash side to side and then front to back. Feel for the loose point: a gap at the meeting rail where the sashes meet, play at the sides against the beads, or the bottom sash rocking on the sill. Note whether it's the top sash, the bottom sash, or both, since that decides which fix below you need.

SW-02Gather your tools and materialsLay everything out before you start so you're not hunting for tools with the window half apart. A small flat chisel or filling knife helps ease beads off cleanly, and a bradawl makes starting screw holes in timber easier.

1 each · Bradawl

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1 each · Screwdriver (flat and cross-head)

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1 each · Small flat chisel or filling knife

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1 each · Craft knife

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1 each · Tape measure

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SW-03Ease off and reset the staff bead (inner bead)The staff bead is the thin timber strip that holds the bottom sash in against the frame. Slide the chisel behind it gently and lever it free without splitting it, then check the gap between bead and sash. If it's loose, glue and pin a thin card or hardboard shim behind the bead so it sits tighter, then refix with brass screws rather than the original tacks so you can adjust it again later.

RULES

8 each · Brass screws 25mm

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1 pack · Thin card or hardboard offcuts

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1 bottle · PVA wood glue

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KNOW THE RULES

If the window is in a listed building or a conservation area, check with your local planning authority before altering original beads or fittings — this can need Listed Building Consent even for minor repairs.

SW-04Reset the parting bead if the top sash rattlesThe parting bead sits between the two sashes, deeper in the frame. Ease it out the same way as the staff bead, and pack or reposition it so the top sash sits snugly without binding when you slide it. Refit with a couple of fine screws or panel pins.

6 each · Fine panel pins

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SW-05Fit a brush pile draught seal in the running channelsCut lengths of self-adhesive brush pile strip to fit the channels the sashes run in, on both sides. This cushions the sash against the frame, stopping rattle and cutting draughts at the same time. Press it in firmly and trim any excess with the craft knife.

1 kit · Self-adhesive brush pile draught seal kit

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SW-06Check the sash cords or spring balancesIf a sash drops slightly or sits unevenly, it can rock and rattle even with tight beads. Remove the staff bead to access the cord and pulley, and check the cord isn't frayed or slack — retie it with the sash held at the right height. If your window has spring balances instead of cords, look for a tension screw at the top of the balance and turn it to take up the slack.

2 metre · Sash cord (if replacing)

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SW-07Fit or adjust a sash fastener at the meeting railA sash fastener (fitch catch) pulls the two sashes tight together when locked, which stops rattle for good and adds security. Mark the position on both sashes, use the bradawl to start a pilot hole in the timber, then screw the fastener in place. Test that it pulls the rails firmly together without forcing.

1 each · Brass sash fastener (fitch catch)

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4 each · Brass screws 20mm

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SW-08Lubricate the running channelsRub candle wax or a light PTFE spray along the timber channels the sashes slide in. This lets the sash move freely so it doesn't stick and get nudged loose again.

1 each · Candle wax or PTFE dry lubricant spray

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SW-09Test and tidy upOpen and close the window several times, checking both sashes for rattle, sticking or binding. Sweep up any wood shavings or dust, and wipe down the frame and sill. Store leftover screws and seal strip in case you need to fit other windows the same way.

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