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Our Traditional Flush Casement windows deliver outstanding performance and are manufactured bespoke to suit traditional or contemporary properties.
This window is internally beaded to meet PAS 24 security levels and has applied slim glazing bars to maintain the aesthetics of the original window but with a much higher performance, typically achieving a whole window U value of 1.4 – 1.0 W/m2K and acoustic ratings Rw of 29-38dB depending on the make-up of the glass unit.
Constructed with slim frame and sash profiles, the Traditional Flush Casement Timber Window uses concealed friction hinges which can be side, top or bottom hung.
Traditional Flush Casements can be supplied fully finished with a 3-coat spray-applied microporous water-based paint system or can be supplied primed only for a topcoat to be applied on site by others.
All our Traditional Timber Casements come with a choice of fasteners, stays and restrictors with a wide range of option finishes.
Product Guidance
| Frame | 56 x 90 mm - Standard. Manufactured using mortise and tenon joints, glued and mechanically fixed. |
| Sash | 46 x 68 mm - Standard. |
| Sill projection | Projections: 35 mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm. |
| Wood moisture content | 12% +/- 2% on delivery |
| Glazing beads | Windows are internally beaded with the external rebate up stand to give the appearance of putty glazing. |
| Air Permeability | 600 Pa (Class 4) BS EN 1026:2000; BS EN 12207:2000 |
| Water Tightness | 900 Pa (Class E900) BS EN 1027:2000; BS EN 12208:2000 |
| Wind Resistance | 2000 Pa (Class 5C) BS EN 12211:2000; BS EN 12210:2000 |
| Whole Window U-Value | Thermal performance is calculated by the standards of EN ISO 10077-1:2006 and achieves a U-value of 1.4 -1.0 W/m²K depending on the type of timber, unit thickness and type of cavity gas used. |
| Whole Window Acoustic rating Rw, dB | Acoustic rating is Laboratory tested to BS EN ISO 10140-2: 2010 (Airborne Sound Insulation). Window Acoustic ratings Rw 29-38 dB. |
| Anticipated Life Expectancy | 60 years with regular maintenance |
Product Specifications
| Material | Manufactured in selected engineered laminated pine, hardwood or Accoya, sourced from sustainable and managed forestry (FSC or PFEC certified). |
| Finish | Window supplied factory finished, externally and internally with Teknos Water-based micro porous opaque to specified RAL colour, or stained finish. Aqua prime 1410, Aqua mid-2901, Aqua top 2600. |
| Colour | White - RAL 9016 - Standard. Any RAL - from RAL classic range. Stain - from TRC stain range. |
| Glazing | Windows are internally beaded with the external rebate up stand to give the appearance of putty glazing. |
| Perimeter spacing bars | White warm edge perimeter spacer with white warm edge integral spacers - Standard. Black spacer optional. |
| Trickle ventilation | A controllable trickle ventilator can be fitted to the window dependant on width of frame EA 2000, 4400mm². |
| Child restrictor | Restrictors which allow the opening of the sash to be restricted to 100mm is an option. |
| Operation | Sashes are hung and operated on the friction hinges and locked by espagnolette locking system. |
| Timber Species | Manufactured in selected engineered laminated pine, hardwood or Accoya, sourced from sustainable and managed forestry (FSC or PFEC certified). |
| Moisture Content | 12% +/- 2% on delivery. |
| Glass | Windows to be factory fitted with 24-42mm thick sealed double-glazing unit Tested to BS EN1279. Composition of glass units is to be (from outside): 4mm float – 16mm argon filled cavity /4mm float glass with Low-E coating. Perimeter spacer in white or black. |
| Glazing Bars | Applied bars are used to achieve the slim section of traditional glazing bars. These are applied with double sided glazing tape to both faces of the sealed unit and capped with clear silicone. |
| Ironmongery | A locking casement fastener to each operable sash with options in colour and finish. |
| Cill | Manufactured in Hardwood with options of Projections: 35 mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm. |
| Ventilation | A controllable trickle ventilator can be fitted to the window dependant on width of frame EA 2000, 4400mm². |
| Finish as Delivered | Window supplied factory finished, externally and internally with Teknos Water-based micro porous opaque to specified RAL colour, or stained finish. Aqua prime 1410, Aqua mid-2901, Aqua top 2600. |
| Restrictors | Restrictors which allow the opening of the sash to be restricted to 100mm is an option. |
| Fixing | Installation to be carried out using best building practices and in conjunction with recommendations of TRC windows. |
| Warranty | Manufacturing and Material Defects: 10-year guarantee. Finishes: The standard three-coat opaque finished joinery guaranteed for 10 years. The stain finishes guaranteed against blistering or flaking for six years. Seals: The seals on double-glazed units are guaranteed for 10 years (from the date of delivery). Ironmongery: Functional failure is guaranteed on ironmongery for two years. |
Technical Drawings
Whole window U-values as low as 1.0 W/m²K.
Concealed friction hinges allow side, top, or bottom hanging.
Secured by Design certified for strong security assurance.
Optional fully reversible design enables safe cleaning from indoors.
Water tightness certified Class E900 for high weather protection.
Available in any RAL colour or TRC stain.
Browse completed installations showcasing TRC’s craftsmanship across a range of properties.
The smooth lines of TRC traditional flush timber casement windows sit beautifully in the frame. However, they offer more than simple, sleek aesthetics. They are Secured By Design (SBD) certified too.
– Traditional Look, Modern Build
– Clean Lines, Strong Security
– Sleek Frames, Certified Design
– Suitable for Conservation Areas
Our timber flush casement windows open outwards and can be top or side hung. They can also be supplied fully reversible to enable external glass to be cleaned safely from inside the building, making them the perfect choice for high-rise developments.
With four glass options mounted in hardwood or softwood frames, double- or triple-glazing, and double-gasketing, weather containment is assured.
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