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Measuring up – sash windows


How to do it – for a sash window. The blinds were designed specifically for sash windows, though they work on other windows (often need a small batten down each side of the reveal – see below). Here is a drawing showing how they fit & which dimensions we need. You can download the drawing as a pdf here and if you’d like a Word version of the dimension chart to fill in it is available here.

thermal blinds

Sash window measuring guide

This is how the track & magnets look on a typical sash window;

blind fitted in a sash window, showing track and magnets

deluxe headrail

Deluxe headrail with side batten fitted for magnets

7 Comments leave one →
  1. V St Clair permalink
    30/12/2011 2:05 am

    Are they more efficient than window film plus polycarbonate secondary glazing, I wonder? They are very expensive. How do you clean them? Where I live traffic fumes pollution comes in through every tiny gap. There are lines of it round every door, including in the fridge, on walls, everywhere. It does not just wipe off – you have to scrub. It stains paintwork and plastics grey. I need thermal blinds but they would have to be easy to clean. At this price I certainly could not afford to keep replacing them.

  2. 30/12/2011 10:08 pm

    Hi V St,
    Window film plus polycarb (not sure why you would do both) is in place permanently so is difficult to compare with the blinds, which are only insulating when they are down. You can see the thermal performance of the blinds on the technical page. As for pollution your best bet is serious draughtstripping by the sounds of it. The blinds are made of heavy duty polyester, which is east to clean (there are several spray cleaners on the market). In areas where soiling is likely, for instance a kitchen, we would recommend a scotchguard type spray.

    • V St Clair permalink
      31/12/2011 2:18 pm

      Hi. I would do window film because the flat is too hot in summer – window film should keep it cooler in summer and slightly warmer in winter. Polycarb because I will never be able to afford glass secondary glazing, which is what we really need to keep the draughts and the 24/7 noise out! We have draughtstripping, but the windows are over 100 years old and now have too few straight edges to make it fully effective. They need replacing really, but the cost of new windows is apparently about £10,000 each (conservation area so existing non-standard design would have to be replicated). Landlord cannot fund this!
      I would do window film, polycarb and the blinds if I could afford it. We can only afford to have the heating on for two or three hours a day, maximum, in winter, so thermal blinds for after dark is a very good idea. They could also be lowered in rooms less used in very hot summer daytimes (bedrooms) to keep the heat out of the flat. Last summer I used aluminised mylar sheets, just sellotaped them up over the windows. Very effective but a nuisance as it kept unsticking.

      • 31/12/2011 2:56 pm

        Hi, that all sounds very sensible, though the replacement window cost is way too high, even for bespoke windows. The blinds are roughly equivalent to triple glazing on a typical single glazed window and they cost £150 per sq.m with the standard headrail (a little more for small ones or very large ones). If you send me the sizes and a photo I’ll give you a price. They work really well at keeping heat out in summer too.


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