Bi-Fold Doors
[Dev] Spring Sash Window product specification
The modern day version of the Vertical Sliding Box Sash Window otherwise known as the double hung sliding sash.
Our Conservation Box Sash Window uses cords, weights and pulleys to counter balance the sashes in the traditional way. Typically a Box Sash Window would be set back in a ‘rebated reveal’ construction so that the box is mostly hidden by the external brick or stone although it can also be seen positioned close to the face of the brickwork with the box on show and dressed with an architrave.
Our Box Sash Windows are equipped with our click fit staff and parting bead which allows the sliding sashes to be easily removed for future maintenance and decoration.




Our Conservation range is suitable for most projects and can be tailored to suit design requirements using our various glazing bar and moulding options. All of our Conservation range products have the ability to meet modern building regulation standards.
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Glazing Specifications
24MM DGU
Standard Specification
24 mm Double glass unit comprising 4 mm Tough / 16 mm Argon / 4 mm Tough Planitherm Total+
14MM DGU
Standard Specification
14 mm Double glass unit comprising 4 mm Tough / 6 mm Krypton / 4 mm Tough Planitherm One

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