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Technical Specifications

Ventrolla Ltd 

Ventrolla Limited is the UK’s leading provider of sash window renovation and performance upgrading services. Ventrolla offers a range of services that improves the energy performance, noise reduction and functionality whilst retaining the traditional architectural features. Our core markets are listed buildings, heritage sites and period properties.

Products from Ventrolla Ltd

Ventrolla offers a renovation service for both sash and casement windows. To minimise cost and avoid unnecessary work the service Ventrolla provides is bespoke, which means the first stage of any project is a full site survey.

The next stage will be to renovate the windows returning them to their former condition and functionality. Ventrolla then install it's Perimeter Sealing System that provides the improvement in energy performance, noise reduction and removes any nuisance rattles. At this time Ventrolla can also install either the Sash Removal System or Swing Sash system as an optional extra, which facilitates sash removal for maintenance, painting etc.

Window Renovation and Performance Upgrade

Technical Data/ Specification

The first stage requires all windows to be inspected and surveyed prior to quotation and commencing work.

Sashes shall be removed and the condition of the timber, glass and pulleys is checked.

Window Repair System

  • Decaying wood shall be removed back to the sound timber
  • VR90 WS stabiliser shall be applied
  • VR90 filler shall be used to fill the gaps and moulded to match the window profile or in the case of larger repairs by splicing in new wood
  • All sash cords shall be replaced and the pulleys serviced to ensure free and smooth operation

Window Performance Upgrading

A perimeter sealing systems using Weatherfin two-piece parting bead comprising of a pile carrier fitted into a U-section shall be installed to ensure the sealing system:

  • conforms to BS EN 12207 : 2000 Class 3 and BS6375-1: 2004. Class C (tested to 600 Pa)
  • conforms to BS 7386: 1990
  • is manufactured from multifilament polypropylene yarn that is silicon treated to be water repellent and UV stabilised
  • independently tested and proven to fall within the 6-10dB noise reduction range

The sealing system shall be installed to the top of the box, mid rail, bottom rail, parting bead and the staff beads.

The sashes shall be weighed and the weights adjusted to ensure the window is correctly balanced and operates smoothly.
 
All exposed and bare wood shall be painted with white acrylic primer to BS5082.
The sashes shall be reinstalled and staff beads fitted (optional removable staff beads with easy release can be fitted with the optional SRS). 
Windows shall be checked for smooth operation.

Method Statement:

  • Staff beads, parting beads and sash cords removed and discarded.
  • Sashes are eased by removing excess paint build-up and removed.
  • Safety Bars are fitted to the window opening while sashes are not in-situ.
  • Adjustments made to ensure min 3mm gap between upper sash face and parting bead face.
  • Mid rail and lower rail of bottom sash routed to profile of pile carrier.
  • Pile carriers fitted into the mid and bottom rails of lower sash and the new staff beads.
  • Where specified, Sash edges routed to allow mounting of invisible Sash Removal System then the Ventrolla sash cord brake and detachable sash cord holder is threaded on to each new sash cord.
  • Ventrolla parting bead snapped into the new U Section installed into the existing parting bead groove.
  • Weatherfin pile weather-stripping size selected and inserted as appropriate to width of gaps to be sealed.
  • Sash weights are adjusted to balance sashes.
  • Sashes re-hung and checked to ensure easy sliding
  • New staff beads mitred or butt jointed and fitted by pinning, brass screw and cup, or easy release clips.
  • Exposed bare wood is painted with white acrylic primer to BS 5082.

Our specification is on NBS which can be used, alternatively you can Click here to download a pdf version of our specification and method statement.

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