Vertical Sliding Secondary Glazing

For box sash windows
Thoroughly traditional look and function with tilt option

This secondary glazing option is perfect for heritage properties and modern buildings alike. Vertical sliders have a tilt option that enables both panels to individually pivot inwards for easy access and cleaning.

Ideal for when you’re unable to replace sash windows with modern double glazing in a listed or heritage property and wish to maintain sightlines of original windows. Secondary glazing sash windows are fitted discreetly on the inside giving you all the advantages of modern living without impacting the façade. They’re also lockable for additional security.

For modern properties, our vertical sliding secondary glazed units offer a vintage look that only sash windows can provide. This enhances your property stylistically while preserving the modern comforts of 80% noise reduction and 65% extra thermal insulation.

Secondary Glazing Illustration
The Granada difference
Quiet
Secondary glazing offers the most effective sound insulation. Reduces noise by up to 80% and significantly outperforms double glazing.
Warm
Improves thermal insulation of existing single-glazed windows by around 65%, approximately 10% more than double glazing achieves.
Secure
An affordable, discreet, highly effective solution to enhancing security. No external access required, ideal for multi-storey buildings.

The Spec

Designed specifically for vertical sliding windows like box sash, or where regular hinged panels are not suitable. Just like a traditional box sash, our vertical sliding units feature two sashes, one above the other, retained within an outer frame.  They are supported by robust spring balances for ease of motion and weight support and fitted with brass rollers of a smooth sliding action.

Special tilt-in feature

Each secondary sash can be independently released from the outer frame. It can then be pivoted inwards by almost 180° making it easy to access all frames. The outside of the glass will be as easy to clean and maintain, without compromising either sightlines or the overall style of your windows.

Customised and guaranteed

We offer a range of 4mm – 8.8mm glazing for thermal requirements as well as reduced noise reduction within your property. You can decide whether you would prefer face-fixed or reveal-fixed and we boast a choice of over 200 RAL colours to match the look of your existing windows. The additional locking facility provides extra security and our 10-year guarantee means complete peace of mind.

You gain all the conveniences of modern living – no cold draughts, noisy and unsecured single panes – without losing any of the style and traditional looks of your property.

It remains one of our most popular options for conservation area buildings and is gaining favour even in more modern developments.

Features & Options of Vertical Sliding Secondary Glazing
Annoyances solved
Annoyances solved
Noise, cold, security, condensation issues managed and controlled.
Multiple design options
Multiple design options
Historic, contemporary, or unusual designs. 200 frame colours, lift out panels.
Many glazing options
Many glazing options
From 4 – 8mm thickness to thermal coatings, all fully customised.
Full advisory service
Helpline for homeowner product, service or installation queries.
Full advisory service
Delivery or installation
Local installers trained and accredited by us or home delivered.
Delivery or installation
10 Year Guarantee
For all frames and glazing. British factory made, engineered to last.
10 Year Guarantee

A colour to suit your scheme

Find the perfect match for your Granada window insulation system using our range of over 200 RAL colours. Whether you own a new build, listed property or commercial property, we can fit your requirement.

RAL 1000RAL 1001RAL 1002RAL 1003RAL 1004RAL 1005RAL 1006RAL 1007
RAL 1011RAL 1012RAL 1013RAL 1014RAL 1015RAL 1016RAL 1017RAL 1018
RAL 1019RAL 1020RAL 1021RAL 1023RAL 1024RAL 1026RAL 1027RAL 1028
RAL 1032RAL 1033RAL 1034RAL 1035RAL 1036RAL 1037RAL 2000RAL 2001
RAL 2002RAL 2003RAL 2004RAL 2005RAL 2007RAL 2008RAL 2009RAL 2010
RAL 2011RAL 2012RAL 2013RAL 3000RAL 3001RAL 3002RAL 3003RAL 3004
RAL 3005RAL 3007RAL 3009RAL 3011RAL 3012RAL 3013RAL 3014RAL 3015
RAL 3016RAL 3017RAL 3018RAL 3020RAL 3022RAL 3024RAL 3026RAL 3027
RAL 3028RAL 3031RAL 3032RAL 3033RAL 4001RAL 4002RAL 4003RAL 4004
RAL 4005RAL 4006RAL 4007RAL 4008RAL 4009RAL 4010RAL 4011RAL 4012
RAL 5000RAL 5001RAL 5002RAL 5003RAL 5004RAL 5005RAL 5007RAL 5008
RAL 5009RAL 5010RAL 5011RAL 5012RAL 5013RAL 5014RAL 5015RAL 5017
RAL 5018RAL 5019RAL 5020RAL 5021RAL 5022RAL 5023RAL 5024RAL 5025
RAL 5026RAL 6000RAL 6001RAL 6002RAL 6003RAL 6004RAL 6005RAL 6006
RAL 6007RAL 6008RAL 6009RAL 6010RAL 6011RAL 6012RAL 6013RAL 6014
RAL 6015RAL 6016RAL 6017RAL 6018RAL 6019RAL 6020RAL 6021RAL 6022
RAL 6024RAL 6025RAL 6026RAL 6027RAL 6028RAL 6029RAL 6032RAL 6033
RAL 6034RAL 6035RAL 6036RAL 6037RAL 6038RAL 7000RAL 7001RAL 7002
RAL 7003RAL 7004RAL 7005RAL 7006RAL 7008RAL 7009RAL 7010RAL 7011
RAL 7012RAL 7013RAL 7015RAL 7016RAL 7021RAL 7022RAL 7023RAL 7024
RAL 7026RAL 7030RAL 7031RAL 7032RAL 7033RAL 7034RAL 7035RAL 7036
RAL 7037RAL 7038RAL 7039RAL 7040RAL 7042RAL 7043RAL 7044RAL 7045
RAL 7046RAL 7047RAL 7048RAL 8000RAL 8001RAL 8002RAL 8003RAL 8004
RAL 8007RAL 8008RAL 8011RAL 8012RAL 8014RAL 8015RAL 8016RAL 8017
RAL 8019RAL 8022RAL 8023RAL 8024RAL 8025RAL 8028RAL 8029RAL 9001
RAL 9002RAL 9003RAL 9004RAL 9005RAL 9006RAL 9007RAL 9010RAL 9011
RAL 9016RAL 9017RAL 9018RAL 9022RAL 9023

Gallery

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