Home > Companies > TRC Windows > Traditional Box Sash Windows

Timber sash windows which embrace the all style and function of traditional box sash windows, yet are enhanced with modern construction and materials. Smooth-running and robust, they feature a classic weight-and-pulley mechanism.

Suitable for non-listed buildings and contemporary developments, the sash windows are available in a selection of hardwood and softwood frame finishes, along with RAL colours. With the option of safety glass, obscured glass, acoustic glass or solar control glass, the wooden double-glazed sash windows can be tailored for every situation.

Bespoke windows and doors are available; consult manufacturer for details.

Standard product features

Frame:

100 x 160 mm (lining width x frame depth), manufactured using mortise and tenon joints, glued and mechanically fixed.

Sash:

39 x 55 mm top rail and stiles, 90 x 55 mm bottom rail, 45 x 55 mm meeting rail.

Mullion/ transom:

200 mm wide (130 mm for triple sash with fixed outer sash).

Sill section:

54 x 160 mm.

Staff/ parting beads:

Timber.

Wood moisture content:

12–19%.

Glazing beads:

Internally beaded.

Sill:

Solid hardwood.

Horns:

Solid feature horns to top sashes are included as standard.

Fittings:

A lockable fitch fastener and two finger pulls to the bottom sash.

Mechanism:

Sashes are hung on cords or chains, operating over pulleys and counter balanced with lead weights.

Weather seal:

The window is fully weather sealed to BS EN 6375-1.

Performance:

  • U-value (to BS EN ISO 10077-1): ≥1.6 W/m²K.
  • Air permeability (to EN 1026:2000): Class 4.
  • Water tightness (to EN 1027:2000): Class 4A.
  • Wind resistance (to EN 12211:2000): Class C4.

Options

Finish:

Three coat spray applied factory finish using water based micro-porous paint/ stain.

Trickle ventilation:

Concealed through frame head trickle ventilator. 1700 mm², 4400 mm² or 5000 mm² air flow dependent on frame width.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-25-99/350 Wood window units

NBS Specification

NBS Buliding logo
This product is associated with the following NBS clauses:

Product specification

An important note about specifying

Manufacturer

Name:

TRC Windows

Tel:

+44 (0) 1858 469225

Product reference

Traditional Box Sash Windows

Size

[As drawing]
-
Insert reference.
[As schedule]
-
Insert reference.

Material

[Engineered Accoya]
[Engineered European oak]
[Engineered hardwood]
[Engineered redwood]
-
Standard.

Sill projection

[35 mm]
[50 mm]
[60 mm]
[70 mm]
[80 mm]
[90 mm]
[100 mm]
[110 mm]

Sill horns

[Not required]
[As drawing]

Sash horns

[Not required]
[Type H1]
[Type H2]
[Type H3]
[Type H4]
[Type H5]
[Type H6]

Window board groove

[Required]
[Not required]

Internal glazing bars and/or perimeter bead

[18 mm lambs tongue type 2]
[18 mm ovolo profile type 2]
[22 mm lambs tongue type 1]
[22 mm ovolo profile type 1]

External glazing bars

[18 mm chamfered putty bar]
[22 mm chamfered putty bar]

Finish

[Dual finish]
-
Insert requirement.
[RAL classic range]
-
Insert requirement.
[Stain]
-
Insert requirement.

Glass units

[24 mm double glass unit]
-
4 mm tough/ 16 mm argon/ 4 mm tough low-E.
[24.8 mm sound control double glazed unit]
-
6.8 mm sound control laminated/ 14 mm argon/ 4 mm tough low-E.
[Special order]
-
Insert requirement, safety, obscured, acoustic or solar control glass options available.

Perimeter/ Integral spacer bar

[Black warm edge perimeter spacer and integral glazing bars within unit cavity]
[Matt chrome warm edge perimeter spacer and integral glazing bars within unit cavity]
[White warm edge perimeter spacer and integral glazing bars within unit cavity]

Ironmongery

[Antique brass sash fitch fastener, sash lifts, sash pulleys]
[Brass sash fitch fastener, sash lifts, sash pulleys]
[Oil rubbed bronze sash fitch fastener, sash lifts, sash pulleys]
[Polished chrome sash fitch fastener, sash lifts, sash pulleys]
[Satin chrome sash fitch fastener, sash lifts, sash pulleys]
[Satin nickel sash fitch fastener, sash lifts, sash pulleys]
[Special order]
-
Selected Croft ironmongery with bespoke finish is available; consult manufacturer and insert requirement.

Trickle ventilation

[Not required]
[Concealed through frame head trickle ventilator]

Child restrictor

[Not required]
[Angel lock]
-
Standard.
[Traditional sash stop]

Manufacturer details

Knoll House ,
Union Wharf ,
Market Harborough ,
Leicestershire, LE16 7UW
Tel +44 (0) 1858 469225
Fax
NBS Plus
NBS National BIM Library
Other content by this manufacturer:
Company Overview Products (7) BIM (46)