Technical Specifications

Here you can read in more detail about the technical details of the windows we produce and the materials we use within our repair and upgrade services.

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Repair Care

Decoration Protocol

Weather Seals

Heritage Glazing

Furniture

Sustainable Hardwood

Stained Glass

Noise Reduction

Thermal Performance

Repair Care

Sashcraft is an accredited user of the Repair Care International system, which is used in combination with traditional joinery methods. It offers a total solution for sustainable timber restoration and maintenance. The DRY FIX®/DRY FLEX® primer and repair system is the only durable solution for decayed and damaged joinery. DRY FIX® primers penetrate deep into the fibres of the wood ensuring that DRY FLEX® bonds permanently. Based on a unique epoxy resin formula, DRY FLEX® remains elastic so that it accommodates any movement.

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Decoration Protocol

  • To comprehensively rub down all joinery
  • Areas of defective paint will be burned/sanded back to bare timber
  • The external side of retained existing sashes will be burned back to bare timber in most cases
  • All rotten wood to be cut out and restored using the Repair Care International system and traditional joinery methods
  • Conservation joints will be created appropriately to allow for movement to the windows and any other external joinery in preparation for decoration
  • Any new wood to be primed with micro-porous paint
  • Internal and external joinery will be finished with up to three coats of high-quality, water-based, micro-porous paint. Please note that all mouldings associated with the windows internally will be fully decorated.
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Schlegel Weather Seals

We use Schlegel weather seals, which have numerous benefits, including:

  • Excellent memory – returns to original shape after compression
  • Stability – low/no stretch gained by glass fibre internal cord or insert
  • Easily compressed – low compression forces, unaffected by temperature variance
  • Acoustics – independently tested outstanding acoustic performance
  • Thermal conductivity – independently tested unrivalled thermal performance
  • Paint and stain proof – unaffected by standard paints and stains
  • Stabilised – unaffected by rot, fungi, UV light or ozone
  • Patented – innovating seals for over a century
  • Temperatures – the widest operating range – from +70ºC to -65ºC
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Heritage Glazing

Developed by Safe Guard  – the first UK Company to offer a fully certified, kite marked, heritage IGU Solution.

SafeGuard is the first company in the UK to achieve EN 1279 Parts 2 and 3 across a range of heritage IGUs as our CLARITY Classic range of slim units sailed through the moisture penetration index, and gas loss rates at BSI laboratories.

With an 8.5mm sightline and a five year guarantee, the CLARITY Classic range from Safeguard is the perfect option for those seeking a low sightline, alongside units that are made to the highest quality. Available in spacer sizes of 4mm, 6mm and 8mm in either dark brown or silver with white also available in 6mm and 8mm versions.

CLARITY Classic slim units are available incorporating a range of period glasses to closely replicate the aesthetics of the original glass.

Through extensive research, our CLARITY Classic sealed units are designed to provide the ultimate in long-lasting performance by incorporating a dual seal unit with aluminium spacer & a high performance sealant developed in conjunction with the world’s leading igu sealant manufacturer Fenzi.

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Sashcraft use a 6mm or 8mm krypton gas filled cavity with toughened glass as standard. This will be dictated by the thickness of the existing sash arrangement for the Renovate and Sash Replacement Service.

For Complete Replacement projects, a 8mm krypton filled cavity will be used with a U Value of 1.1 W/m2k.

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Furniture

For sliding sash windows, we supply and fit new high-quality window accessories: brass/chrome pulley wheels, sash lifts and a lockable heritage fitch fastener – which has been approved as a  Secured By Design Official Police Security Initiative.

For casement windows, we supply and fit high-quality fasteners and stays: solid brass or chrome as preferred with lockable options.

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Sustainable Hardwood

Cambridge Sashcraft work hand in hand with Rosewood Joinery to develop replacement sashes, windows and doors.

We use Utile hardwood from Latham Timber  to construct our sashes for both our renovate and sash replacement and complete replacement services.

The sashes are made in our local joiners workshop, Rosewood Joinery. Owned and managed by Paul Bailey, Rosewood Joinery use traditional methods with meticulous attention to detail to create superior replacement sashes, windows and doors.

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Stained Glass

Cambridge Sashcraft work with local Stained and Leaded Glass Specialist Damon McDonald to offer sympathetic restoration of stained and leaded windows using traditional methods. Glass can be repaired and professionally cleaned and we can create bespoke glass panels for windows and doors.

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Noise Reduction

The Sashcraft Advanced Sealing System significantly reduces the amount of noise ingress; noise travels in a similar way to air and will find a route into a building through any gaps. Sashcraft’s memory foam based sealing system minimises the gaps and improves noise resistance.

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Thermal Performance

The use of the Repair Care system in combination with traditional joinery methods and a professional decorating service ensures that there are no gaps in or around timber to facilitate air ingress.

The Sashcraft Advanced Sealing System uses memory foam seals that are independently tested showing unrivalled thermal performance. Air permeability is significantly reduced keeping draughts out.

The low u-value of our conservation approved glazing greatly reduces the amount of heat loss through the glass.

As a whole, our service options contribute to a reduced u-value and a more energy efficient building.

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