As well as box sash windows we supply and fit new double glazed, casement windows. Our double glazed casement windows are manufactured to compliment and period single glazed traditional Victorian or Edwardian window. Fully focused on period heritage, each timber profile is meticulously designed to not only replicate the Victorian and Edwardian elegance, but to give the modern benefits of keeping your home warm and provide ultimate durability.
Our standard European Redwood casement windows have engineered timbers throughout, with a hardwood Meranti sill for ultimate durability. The casement sashes have a choice of either a multipoint locking system loaded on frictionless, easy clean hinges or a more traditional method of ball bearing butt hinges hinges with a stay and fastener for secure locking. The glass units are internally beaded as all glazing products should be, with a beautiful timber putty replicating sight line to the outside.
At North London Box Sash we supply our windows with the latest glass technology with accompanying products that surpass the UK’s standard building requirements. All windows are finished in our workshop with one of the worlds leading timber paints, with two undercoats and two finishing coats, new windows will repel even the harshest of weathering at any temperature. With a modern addition of draught proofing the Schlegel gaskets that are fitted to our windows keep out gales whilst also insulating.
Engineered timber is purposely manufactured from smaller selected prime cuts, from knot free European Redwood. The timber sections are meticulously finger jointed and laminated together forming one solid piece of timber. This enhances strength, stability, durability, and also has the positive values of minimal shrinkage and expansion, there is also a 30% less wastage that occurs using large stock timbers that have to be machined to size.
Stock timbers can have natural distortions like knots, warping, and hard grains, which can in time become visible. The window timbers we use are available in various grades, European Redwood that is our standard timber, good enough to withstand any hard weathering conditions. Meranti hardwood, a more dense timber for expectant exposure to extreme weathering, is also available for clients who desire supreme quality.
Low expansion and shrinkage, preventing seasonal movement
Stability, strength with no cracking
Anti-Fungus with water repellent treatments
Ethical and sustainable with minimal wastage
Ultra-Clear 4mm Float Glass
90% Argon Gas
Warm Edge Spacer
Low-emissivity glass (or low-e glass as it is commonly referred to) is a type of energy efficient glass, designed to prevent heat escaping out through your windows to the cold outdoors.
By installing our low-e windows glass units, you can significantly improve your window energy ratings and reduce the amount of energy lost through your windows by up to 75%!
Heat always flows towards the cold, therefore window glass without a low-e coating will absorb the heat from your home and radiate it onto colder outside surface where it is lost. Low-e glass has a special coating which is an inactive radiator of heat, and does not allow heat to be transferred to the outside Instead the low-e coating actually reflects the heat back into your room, this can eliminate internal condensation that can rest on cold surfaces like glass. Low- E glass also reduces ultraviolet ray penetration by 73% to help keep curtains, rugs and furniture from fading.
Stops internal heat from escaping rooms
Reflects heat from radiators back into the room
Stops internal condensation
Allows external heat to enter the room
Reduces ultraviolet rays by 73%
Low E glass comes as standard with argon gas (instead of air) between the panes to increase energy savings even more. Argon is colourless, odourless, non-corrosive, nontoxic and non-flammable. It’s known for its insulating qualities and provides 30% more resistance to thermal conductivity than air.
Enhances sound proofing characteristics
Minimizes heat exchange through the window
Reduces the possibility of condensation and frost
Can be used in all climates
Does not corrode window material unlike oxygen
Does not contaminate the environment; non-toxic gas
When it comes to building sustainably, high-energy efficiency, durability, and indoor climate are key factors. To achieve this, thermally optimized edge bond solutions for insulating glass are what it takes. With our warm edge spacers between the glass panes, our technoform warm-edge spacer improves the thermal performance of the edge bond and thus guarantees gas tightness at a peak level. The effects are not only minimized energy losses there is also a visible reduction in external condensation that can form at the edge of the window and thereby prevents the formation of mould. A warm edge spacer significantly reduces the circulation of air near the window that gives you better life quality inside your home.
Increased thermal performance
Supreme bonding properties, guarantees gas tightness
Reduction in external condensation
Promotes mould reduction
All our windows come with four workshop applied coats of Teknos Aqua Top, Micro-Porous paint, two undercoats, two finishing coats with a standard colour of RAL 9016, Traffic White. Our dedicated painters take every precaution to make sure every coat of paint is perfectly applied. We have an extensive colour range to match your requirements with over 200 RAL colours to choose from. https://www.ralcolor.com/
Teknos coatings dry to a hard but elastic finish. They penetrate deeply into pores to form a protective, flexible shield, which resists cracking due to the natural movement of the wood and maintains surface integrity. Hard yet flexible surface resists cracking (to the left: standard coating, to the right Teknos coating)
Using state-of-the art technology, particle sizes of pigments and binders have been progressively reduced. The resulting improvements in flow, penetration and saturation have raised quality to new levels.
Teknos exterior and interior wood coatings stand for quality and environmental responsibility on every parameter.
Teknos coating systems provide outstanding adhesion. Primers, intermediates and topcoats are all formulated on a selection of compatible, premium quality binders, creating a high degree of synergy in the final coating system.
The optimal protection and adhesion achieved thorough formulation technology that enables nano particles to penetrate deeply into the wood
Impregnation and wood preservative fluid contains actives that penetrate the wood Fluid evaporates but actives remain to protect the wood against fungus and decay.
Specially developed products ensure excellent result on all timber species typically used in exterior joinery; resisting extractive staining on hardwoods and minimising discolouration from softwood knots. These water based antibleeding and knot sealer products lock in extractives, significantly reducing opaque topcoat discolouration.
Teknos coatings also allow wood to breathe; essential for keeping windows and doors in top condition. Teknos micro porous coating systems allow moisture vapour to pass through, allowing the timber moisture content to maintain equilibrium though the seasons and reduce the risk of moisture accumulating in the wood, eventually causing blue stain or decay. Water is repelled while moisture is allowed to escape.
Thanks to light-fast pigments Teknos protective coatings colours do not turn yellow or fade for many years. Wood does not turn grey or become rough.
Combined hardness and elasticity
Excellent stain locking
High water-vapour permeability
Effective protection of wood and colour against UV radiation
Our draught proofing systems are unique to others; using the latest technology and Schlegel gaskets, we have designed a system that is integrated and discrete. Why is this significant? A traditional single glazed, box sash window did not have draught proofing components, and this allows the window to be visually minimal and easy to maintain/ paint.
Common casement draught proofing may have exposed brushes or stuck on surface mounted rubber tape, along with being unsightly these can have poor function. At North London Box Sash all our windows come fully installed with Schlegel gaskets, a hardwearing durable draught proofing gasket with supreme capabilities including soundproofing and insulation
Leading technology gaskets
Hidden draught proofing system
Compliments effortless operation
Easy-Clean, Frictionless Hinges
Choice of Traditional or Modern operating master handle.
A sash horn is a decorative timber that follows off from the end of the sash styles (side of the sash). Sash horns were originally used in timber sash windows to strengthen the window’s structure. They supported the mortice and tenon joints and prevented the sashes from opening too far and becoming jammed. As the Victorian period progressed, architects wanted to use increasingly larger glass panes. Without the glazing bars, a new method of support was needed. Thus, sash horns were born.
Our standard sash horns are detailed below, although bespoke horns can be replicated at clients request.
Our fitters will arrive on site for 8:00am.
Teams will start on the top floors and work down, but can start alternative rooms at clients request.
Standing objects will be covered in each room with light-weight plastic non dust penetrating sheeting. Floors covered with heavy-duty dust proof and waterproof sheeting, an additional hard surface membrane laid down on direct working areas. Foot traffic cover throughout your home, covered by either stick down carpet protector or dust sheeting.
Removal of existing casement frames and openers, all stored externally in a safe area, if there are no safe areas all refuse will be taken of site immediately. Installations that are book for one day, refuse will be removed same day regardless.
Your new casement windows to be supplied & fitted.
If required, new internal 70mm OG architraves will be fitted with bullnose.
All surrounding interior plasterwork will be made good where required, and plastered ready for finishing and painting.
New windows will be externally re-pointed using the traditional sand & cement method or, low modulus mastic applied to the external perimeter of the window.
All work areas will be fully cleaned and vacuumed each evening.
All glass and work areas will be fully cleaned internal and external on completion, gutters cleaned and debris removed externally on ground floors.
All rubbish will be removed from site on completion.
Our fitters will check with the client to see if they are 100% satisfied with the installation and cleanliness.
Your final invoice will be issued of the remaining 50%
FENSA will be informed of your installation and a certificate with the details of your project will be sent via post.
Our knowledge of over 30 years working with Victorian and Edwardian box sash windows, casement windows & external doors gives us supreme confidence you will be satisfied with our outstanding workmanship and the materials that we use.