The Blenheim Sliding Sash Window

The BLENHEIM spirally hung sliding sash window has been developed to meet the needs of today´s market for cost effective high performance with low maintenance. It´s been accepted not only by premier-brand house builders but planning authorities and architects alike.

Each window in the range is tailor-made to order using proven sections and ovolo mouldings in keeping with traditional joinery practice. Virtually any size, style and shape can be produced, within practical limitations, giving specifiers complete freedom of choice. Coupled with our in-house design service, sections can be adapted to meet aesthetic requirements of listed buildings and properties within conservation areas where attention to existing detail is paramount.

Operation

Sashes are operated using high-quality pre-tensioned, heavy duty spiral spring balances.

Materials and Construction

Windows are manufactured in quality European Redwood, from PEFC certified forests or from environmentally sourced species of hardwood. Joints are formed using advanced machining methods and purpose designed tooling.
The Blenheim window has been tested to meet the most stringent British Standard BS6375 Parts 1, 2 and 3, Severe Weather Resistance ratings and Mechanical Strength .

Glazing

Blenheim windows are supplied factory glazed in accordance with BS 6262. Variations including toughened, laminated, obscure glazing and gas filling are available upon request. Either single or double glazing can be supplied. Single glazed sashes incorporate putty profile beading or left open to accept putty by others.

Acoustic Glazing

MH Joinery has extensive experience in the field of sound attenuation. Further details are available upon request.

Fire exit and retardant designed frames

Fire resistant framing and minimum sized egress information is available on request.

Health and Safety

Frames calculated to exceed CDM recommended limits can be supplied de-sashed if required, for ease of handling and fitting. Blenheim windows incorporate a removable push-fit timber staff bead, allowing effortlessness sash fitting or removal without the need for re-decoration. A site commissioning service by our skilled remedial team is available. Please ask for further details.

Security

Sections within the entire MH Joinery range have externally beaded profiles in line with good joinery practice. Factory glazing incorporates a proven security tape and pinned glazing beads.
The Blenheim window has been tested to PAS24.

Building Regulation Part ‘L’

Thermal simulation testing has been carried out in accordance with ISO 15099. All products passed thermal conductivity readings in line with or exceeding Document Part 'L' and meet the latest regulation standards (October 2010).

Window Energy Rating

MH Joinery manufacture a range of BSI A - C rated windows (WER). Our products meet or exceed the current Building Regulation requirements. Energy rating details are available upon request.

Applied glazing bars

To meet the visual requirements of clients and planning authorities, MH Joinery has adopted the applied glazing bar system to replicate slim sectional bars of single glazed windows.
A 22mm bar is standard with a 19mm option. Internal bars are tenon-jointed into the sash and external bars applied to the glass in a controlled environment as a matrix, in a putty-check design. Bars applied this way are extremely unlikely to delaminate away from the glass over time. The air space within the sealed unit is filled with a back-to-back spacer to visually replicate individual panes.

Ventilation

To avoid detracting from the aesthetic lines of the window, discreet trickle ventilation is hidden and operated via the head of the frame as standard.

Timber preservative treatment

All softwood timber sections are preservative treated before assembly by the double vacuum impregnation process, using inert water based materials.

Finishes

Windows are supplied as standard in a semi-finished condition of one basecoat of stain or primer/undercoat plus one top-coat of water based stain/micro-porous paint. Full factory finishing incorporating a third top-coat is available as an option. When site decorating, it´s important care is taken to avoid contact with operational and moving parts of the window. Paint applied to weather stripping and ironmongery will impair overall performance.

Ironmongery

High quality Blenheim ironmongery includes one Fitch type fastener (two to sashes over 900mm wide) and two sash lifts. Opening restrictors and trickle vents are optional, all supplied factory fitted if specified.
Standard ironmongery finishes include traditional brass, polished bright chrome and satin plate chrome.

Ironmongery extras

Sash pulls ('D' handles).
Security/restrictor locks

Security/Safety/Design options

The following optional extras are available to clients own specification.

Sash horns matching existing or clients own profile to inner and outer sashes
Extended jamb and head linings
Cill horns and extensions
Hardwood cills
Full Grooving for water-bar underside of cill
Full factory paint or stain finish in selective RAL shades
Sash commissioning service - Frames supplied initially, sashes fitted and balanced by MH Joinery site remedial operatives

Complete joinery package

To complement the Blenheim window, a complete range of compatible joinery to a customer´s own specification, including doors, door frames and French casements is available, ensuring continuity throughout a project. In addition, we offer a full design service and comprehensive technical support.