WHY IS THE DEPTH OF THE SASH WINDOW FRAME SO IMPORTANT?

There are many timber window suppliers who only sell their “standard” window, irrespective of how it will look or fit in your property – rather than providing a service aimed at retaining the authentic character and look of your home.

All windows look great in a showroom, but will they really look like your originals or fit correctly?

Because of thicker and cheaper double glazing units, many standard design sash windows have thick frames, often up to 174mm thick.

At Timbawood we offer a range of frame thicknesses, with frames from as slim as 120mm, to ensure they will fit perfectly in your period property.

BUT WHY DOES THIS MATTER TO YOU?

The images below show cross sections of sash window frames of varying thicknesses. (Click on images to enlarge).

Most period properties, especially in and around London, have an L shaped recess (check reveal) in the outer wall to allow space for the window frame so that it can sit flush against the inside of the wall, without protruding into the room.

The space to take the frame is usually only between 140mm and 150mm deep, so the thickness of the frame needs to match this (see the cross-section above left, set at 145mm reveal depth with a 140mm frame depth).

If the sash frame is too thick, it will protrude into the room rather than sitting neatly within the recess (see the cross-section above right, set at 145mm reveal depth with a 168mm frame depth).

This may not sound like much of a problem, but with a bulkier frame the architrave will have to be packed out and can stick into the room by up to 2 inches, which will look very bulky indeed.

On a splayed bay, due to the angles, the effect will look even worse.

WHAT TO REMEMBER WHEN ORDERING SASH WINDOWS

When requesting surveys or quotes for box sash windows, make sure that you ask them whether the frame will align flush with your wall.

It is details like this that will prove to you whether the window supplier offers a bespoke service, or a standard product. 

Timbawood are expert in designing, manufacturing and installing bespoke, traditional timber windows and doors.

As specialists in windows and doors for period, conservation and listed properties, we can exact-match your current windows down to the finest detail. 

If you would like get some honest advice, or to arrange for a free survey by Timbawood, please call us on 0208 893 4889 or email us at sales@timbawood.co.uk

 

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