Certass Accredited

Supply & Installation

Which? Trusted Trade

Free 10 Year Guarantee

Quick Quote

Spectus Vertical Sliding Windows

  • WER to Band A+
  • U-value to 1.3W/m2K
  • Thermal inserts using recycled composite materials
  • 24mm double glazing as standard

Period style, authentic detail

The Spectus vertical slider combines perfect proportions, period details and traditional techniques. Both frames and sashes can be mechanically jointed, avoiding the ‘giveaway’ mitred weld of PVC-U.

Vertical Sliding Windows Explained

The Spectus vertical slider is engineered to insulate and keep homes protected from the elements.

24mm double glazing is standard, and for exceptional energy efficiency, the multi-chambered sections can be enhanced with the addition of purpose-made recycled thermal inserts.

Pile seals to the sash and outerframe prevent the draughts that are common with timber frames and features like our optional, dedicated weather bar add another level of defence against rainwater. These frames are durable, tough, resistant to the forces of nature and need next to no maintenance.

Vertical Sliding Window Options

Our windows can be fully mechanically jointed, achieving the appearance of a timber frame’s construction. Foiled finishes give the option of textures and period colours – the appearance has been nailed. Add to that our durability, security and energy efficiency and you’ve got a very persuasive argument.


Light Oak

Black Brown

Anthracite Grey





Agate Grey

Pebble Grey

Sage Smooth

Chartwell Green

Dark Green

Steel Blue

Dark Red

Hazy Grey Finesse

Kensington Grey

Buckingham Grey

Basalt Grey Smooth

Slate Grey Finesse

Slate Grey

Anthracite Grey Smooth

Black Ulti-Matt


Irish Oak

Honey Oak Super Matt

Swamp Oak

Silver D Smooth


Flemish Gold Smooth

Download a Vertical Sliding Window Guide

View more benefits, styles, colours and much more.


Vertical Sliding Windows Benefits

Safety restrictors

When sprung outwards, they prevent sashes opening more than a set amount. Turning the key retracts and secures the stops allowing the sashes to slide past and open fully.


Trickle ventilation units have a slide-open-and-closed operation. Take care not to damage the unit when sliding the bottom sash up.

Your Next Steps

Why choose us
Which Trusted Trader logo

Got a question? Call us on 0116 403 0279

You can also email our team of experts on enquiries@customtradesystems.co.uk

Copyright 2023 Custom Trade Systems Ltd, All Rights Reserved. Registered in England & Wales No. 13185588 | VAT No. GB 437148488

We are using cookies to give you the best experience on our website.
You can find out more about which cookies we are using or switch them off in settings.