Frame Specification
Vertical sliding sash windows
Allan Brothers have designed and manufactured traditional sash windows for many years. We have now developed a sash window which incorporates modern thinking and technology whilst maintaining traditional styling and values.
Sizes
The recommended minimum and maximum sizes are:
- Minimum 400mm wide - 1,000mm high
- Maximum 1,500mm wide - 3,000mm high
Performance
Tested independently and approved to BS 6375 Part 1, achieving a '2,400 Special' exposure category and the following pressure class ratings:
- BS 6375 Part 1
- E 2500 exposure category
and the following pressure class ratings:
- Air Permeability: 600Pa
- Water Tightness: 300Pa
- Wind Resistance: 2,400Pa
Frame Soles
Windows are supplied with flush soles as standard. 25, 45, 62 and 87mm timber sole extensions are also available on request.
Please note that, in the event of windows in a reveal situation requiring a sole extension, the amount that the extension will need to be cut back from each end of the window to the depth of the reveal should be clearly specified.
Cases
The windows are supplied with 95mm wide inside facings forming an open pulley box to suit reveal openings. Boxed mullions with continuous head and soles, 153mm wide to suit 6 inch imperial stone mullions, are standard, although wider ones can be made to order. If required, 110mm wide outside facings (95mm from daylight) external mullion plates can be provided.
Construction
As standard, the windows are made from quality redwood. A hardwood option is also available.
The range is constructed from generously proportioned timber sections.
Security
Designed to score an A+ rating to meet and exceed the requirements of BS 7950 - Enhanced security for windows in private dwellings, this range offers a stronger and more effective deterrent to would-be burglars and vandals than ever before.
This, also combined with the assurance of quality, styling and attention to detail makes the A-Series the perfect choice for those who are concerned with security.
Security locking by shoot-bolt espagnolette system with 6 locking points.
High performance security glazing features double sided tape with a silicone infill around the unit and secured with our glazing system.
A+ enhanced security exceed to BS 7950 standards.
Finish
Finish
Allan Brothers' products are treated with preservative after all machining. This is applied by means of a double vacuum process in accordance with BS8417 and NHBC recommendations.
Our water-based coatings are carefully formulated to seal the end-grain against moisture ingress, inhibit tannin stain and give the timber a quality look and feel.
Ventilation
All ventilators comply with current building regulations: Approved Document F England & Wales and Scottish Building Standards Section 3.
Pulleys
Brass wheel pulleys with mirror finish polished brass face plates are fitted as standard. Ball bearing pulleys with mirror finished polished brass faceplates, for a smoother vertically sliding action are fitted as standard.
Fasteners
As standard, one brass non-locking fitch fastener is fitted to the meeting rails and two brass hook lifts to the lower sash rail. On request, most other recognised fittings can be provided.
Security devices
Can be fitted if required and, as a minimum, we recommend one face fixed 'sash lock' and strike plate fitted with detachable key.
Optionally, for improved security, two such devices can be fitted, whilst most other available patterns can also be supplied and fitted on request.
Cleaning facilities
Special ironmongery can be fitted to cord and weight windows to allow safe cleaning of the sash window from inside the building.
When asked to fit such ironmongery, we provide batten rods that are completely detachable, by means of two thumb screws, on the opening side. Alternatively, if required, the batten rods can be hinged.
Colours
These are our standard colours, however we can provide your windows and doors in any RAL colour.
Glazing
A fully drained and vented glazing system is used for improved performance and insulation and timber beads are fitted all round to simulate a traditional putty line.
Black or white glazing tapes are available to suit the particular window finish.
Specialist glazing, e.g., argon filled, patterned or laminated glass can be fitted if required, to provide additional insulation and/or security. A range of glazing bars and astragals can also be fitted on request.
Learn more about our glazing