Draft-proofing sash windows

The two materials you will need are bristles strips, and compressive foam seals.


First open the window. Put compressive foam seals on the underside of the top and bottom edge of the window (Marked A). When doing this it is important that you cut the strip to the exact size required to provide as complete a seal as possible. For wider frames it may be possible to install a second layer of compressive frame seal.

Next, close the window, and fit bristle strip to both sides of the beading of the lower sash (Marked B). Do exactly the same for the upper sash BUT on the outside.

Finally to draft proof where the sashs meet (Marked C). Bristle strips should be fitter on both sides with the bristles facing each other just touching. This will stop drafts coming in the middle.


17 Responses to Draft-proofing sash windows

  1. […] similar principles can be used for the sides and the top of doors as with the top and bottom of sash windows. First you need some compressive foam seals, or in some cases a roll of soft polystyrene can be a […]

  2. allan buckland says:

    Hi, i am draft proofing a sash window, where do in get the draft proofing from and do i need a roughter.
    cheers allan buckland

  3. John Sisk says:

    Hi Allan,

    I was on the net a came across you post…….

    Q.1 “where do in get the draft proofing from”

    A.1 The best and most widly used method of draught proofing is the brush pile system, the exsiting beads i.e the parting beads and staff beads would be replaced with new beads the have a brush pile carrier machined into the beads allowing you choose the correct sized brush pile.

    When you are draught proofing your sash windows this is the time to do any nessesary repairs and to rebalance the sashes and change the sash cords.

    For materials:

    To see photos of the material in use look at:

    Q.2 “and do i need a roughter”

    A.1 Yes you will need a router Allan to machine a groove in the “top rail” “bottom meeting rail” and “bottom rail” this is for the brush pile carrier.

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