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Frequently Asked Questions

  1. How do I know if my windows are internally or externally beaded?
  2. Why have externally beaded windows been approved for installation?
  3. Why then are externally beaded windows so easy to remove?
  4. Are all externally beaded windows at risk?
  5. How can I check if my windows have been secured with tape?
  6. How can I secure my externally beaded windows?
  7. How do No Go Glass Locks secure the glass panel?
  8. How many No Go Locks do I need?
  9. What are the disadvantages of using a bonding tape?
  10. What are the advantages of using No Go Glass Locks?

How do I know if my windows are internally or externally beaded?

External and Internal Beaded Windows

The simplest way is to look at the window from the outside. If there is a join in the frame around the whole window and in particular an open mitre join in the corners then your window is externally beaded. An internally beaded frame will have a continuous frame which overlaps with the glass panel. If you are in any doubt then you should contact the installer or another double glazing installer who can advise you.

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Why have externally beaded windows been approved for installation?

There are benefits to externally beading the window in terms of heat transfer and moisture ingress as well as in the ease of installation. Most systems require a rubber sealing strip to be inserted on the inside which locks the external bead into place.

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Why then are externally beaded windows so easy to remove?

Intruders have discovered that sliding a sharp knife around the window can cut the bead and allow it to be removed. The window can then be removed. The whole process is quick quiet, and safe to the intruder as no glass is broken.

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Are all externally beaded windows at risk?

Some glazing companies have known about this problem for some time and have used a double sided adhesive bonding tape around the frame to bond the glass to the frame and prevent it being removed. This prevents the glass from being removed but the intruder still causes great damage to the frame. If this happens the whole window has to be replaced even if the intruder does not gain access to the property.

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How can I check if my windows have been secured with tape?

The only way to ensure that your windows have been correctly fitted with bonding tape is to ask a glazer to check by trying to remove one window to check. We do not recommend that you try removing a glass pane yourself. Double glazed units are heavy and should be handled by people trained to do so.

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How can I secure my externally beaded windows?

There are three options:

  1. To have your externally beaded windows replaced with internally beaded. This is a very expensive option, so, as to maintain the appearance it is necessary to replace all windows and not just those that are vulnerable to an intruder.
  2. To have the vulnerable glazing panes removed and secured with tape. This is a tricky and time consuming operation that must be done by a qualified installer. The glass panel has to be inserted into the frame correctly at the first attempt. If a panel is inserted into an opening window frame incorrectly then the window may not shut or seal correctly. In these circumstances the whole window needs to replaced, as the glazing panel has been bonded to the frame.
  3. To Fit No Go Glass locks to the vulnerable panes. We recommend fitting at least two No Go Glass locks to each vulnerable pane (in diagonally opposite corners). This is a less expensive option as the No Go Glass locks can be fitted by anyone with competent DIY skills. However the locks must be fitted in accordance with the supplied instructions and the glass must be thoroughly cleaned and dry before the locks are fitted.

We recommend that fitting No Go Glass Locks is the best and most cost effective solution for securing externally beaded windows.

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How do No Go Glass Locks secure the glass panel?

No Go Window Locks consist of two parts. The lower base part is bonded to the glass using an approved adhesive. Once bonded correctly it is impossible to separate the glass and the metal base. A second ‘shim’ is screwed to the base which locks around the window frame. This shim is designed to fit any window frame profile.

With the panel locked to the frame in at least two corners it is not possible to remove the panel without breaking the panel. This requires considerable force, is likely to make noise and leaves shattered glass through which the intruder needs to climb. The need to break the glass panel to gain access will deter all but the most determined of intruders.

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How many No Go Locks do I need?

Although two No Go Locks are sufficient to secure a glass panel in its frame (fitted in opposite corners of the panel) we recommend that for complete security a No Go Lock should be fitted in each corner of each vulnerable panel.

A vulnerable panel is one that can be reached either from the ground or from any other vantage point such as a roof, wall or fence that can be used to reach the window.

If your windows have locking catches then only panels large enough to allow an intruder to crawl through need to be secured – but please bear in mind that intruders can get through a opening much smaller than you may imagine. If in doubt please consult your local Crime Prevention service who will be pleased to advise you.

  • If your windows do not have locking catches then all glass panels must be secured.
  • Never leave keys in window catches
  • For complete security you should fit No Go Locks to all glass panels.

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What are the disadvantages of using a bonding tape?

  1. Bonding tape has the advantage of not being visible, however being invisible also means that it can not be seen by an intruder and does not act as a deterrent. An intruder can cause damage to a window secured with tape even if they do not gain access.
  2. Glass panels secured with tape can not be easily replaced if a unit becomes faulty (leaky) or is damaged or cracked. It is usually necessary to replace the window frame.
  3. It is not possible to check if the bond between the glass and the frame is secure. If the bonding tape has not been fixed correctly, for example the glass was dirty or damp when the tape was fitted, then the panel may not be secured.

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What are the advantages of using No Go Glass Locks?

No Go Glass Locks were designed and patented precisely to overcome the problem of insecure windows.

  1. There are visible signs that the glass panel has been secured and that the glass can not be removed without breaking the panel.
  2. Faulty or broken glass panels can be replaced simply by just unscrewing the lock without any damage to the frame. (Replacement Glass Locks need to be fitted to the new panel – the glass locks can not be removed from the faulty panel - If the panel is being replaced because of faulty manufacture under guarantee – remember to ask your installer to refit the glass locks free of charge.)
  3. The security of the bond between the lock and the glass can be checked. Although it is important to check the bond when the lock is fitted there is no need to check the bond again as it does not deteriorate. However it is possible to check that the lock has been fitted correctly for example when taking possession of a property.
  4. No Go Window Locks fitted to vulnerable windows may enable you to get a discount on your Home Insurance. Please check with you insurance company for details.

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