Double Glazed Sash & Casement Windows


Where replacement sashes are not an option, Ventrolla can manufacture and install complete new windows, including the box frame. As with our replacement double glazed sashes, we use slim glazing units, which enables Ventrolla to manufacture sashes using traditional carpentry methods, including ‘through' or 'solid’ glazing bars, which help to retain the window's authentic feel and look. Another main feature of the slim glazing unit is the reduced sightline of the spacer bar between the two panes of glass, which enables Ventrolla to manufacture narrower glazing bars thereby allowing them to closely replicate the existing or original sashes.

Ventrolla can manufacture complete new windows with either:
• Single glazed units - for use where historic protection applies, or
• Double glazed units - that comply with the current Building Regulations, Part L

Glazing Specification
Slim 16mm (4/8/4) double glazed units utilising the latest Warm Edge Spacer Bar technology, Planitherm Total+ glass (outer pane) and Krypton gas filled cavity.
• Centre Pane U-Value of 1.3 Wm²K
• Total Window U-Value of 1.6 Wm²K

Timber Specification
The new windows are manufactured from either Accoya or treated softwood and/or hardwood. Accoya has a 50 year manufacturer’s warranty against rot and termite infestation. The replacement sashes are manufactured using a range of selected traditional ‘through’ glazing bars, and are manufactured and hand finished by Ventrolla's skilled craftsmen.

Ventrolla Sash Removal System (SRS) Specification
To assist with future maintenance and painting we can install our patented Sash Removal System (SRS) that enables both the top and bottom sashes to be removed for redecoration.

Ventrolla Perimeter Sealing System (VPSS) Specification
All Ventrolla new sashes include the unique VPSS draught system that has been tested to BS 6375-1 2009 Class 3, which is equivalent to 71mph winds.
The system is fitted by routing grooves into the mid-rail and bottom rail in the sashes, and within the inner face of casement windows, to which a pile carrier is fitted and appropriate height weatherfin pile installed. New parting beads and staff beads are fitted that also incorporate the weatherfin pile, creating a fully sealed window.

The Finish
The windows are supplied sprayed with a high build base coat and an anti-stain primer, ready for final finishing coat by others.


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Established for over 30 years, period window specialists, Ventrolla, provide a unique renovation and upgrade service to improve the energy and operational performance of traditional timber windows. Their services include draught-proofing, repair and...
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T(0800) 378 278
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 Ventrolla House, Crimple Court, Hornbeam Business Park, Harrogate, N Yorkshire, HG2 8PB

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