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Frequently Asked Questions about secondary double glazing

What is Secondary Double Glazing?

Answer - Secondary glazing is another window fitted on the inside of you existing window, our system is aluminium with a timber sub-frame, it is some times called secondary windows.

How do I get a Secondary Double Glazing quotation?

Answer - In order to obtain a quotation we will need widths x heights x style (two panel vertical slider, three panel horizontal slider, hinged unit etc)
You would be well advised to have a good look at the options available and which of those suits your requirements for the final operation of the products.

Will Secondary Double Glazing eliminate draughts?

Answer - Yes, but we recommend that you draught proof the existing window as well

Will Secondary Double Glazing reduce noise?

Answer - Yes, considerably, for extra sound proofing consider a different thickness of glass to the existing glass, different thicknesses cut out different wave lengths giving improved noise reduction.

Also consider laminated glass for improved sound reduction, apart from ordinary laminated glass there is now a new generation of acoustic laminated glasses.

For additional reduction of noise pollution leave a 4" (104mm) cavity, line the reveals with acoustic tiles leaving a 3mm gap between the tiles and the prime window. Once again draught proofing the existing window is vitally important, you would be amazed that people/firms do not carry out this basic requirement

Will Secondary Glazing reduce heat loss?

Answer - Yes, the cavity formed between the prime and secondary windows is an effective thermal insulator, if the cavity is more than 4" (104mm) then you can get thermal currents within it that will decrease the insulation value.

How do I place and pay for my order for Secondary Glazing?

Answer - You can order by email; please see the top of the page for our email address.
We accept secure credit card payments over the telephone: 01325 310520, We accept the following credit cards: visa, switch and mastercard.

You can post us a cheque, made payable to Protech Direct


Protech Direct, Blue Bridge Centre, Horndale Avenue, Newton Aycliffe, County Durham, DL5 6DS, UK

How long will delivery take?

Answer - Delivery takes between 2 - 4 weeks (6 weeks for remote areas)

What are the advantages of Secondary Glazing?

Answer - The advantages are: Reduced noise pollution, Lower heating costs, Added Security, Increased Comfort

How long would it take to install?

Answer - Installation, either by yourself or us (within the north east of England) is quick, mess free and stress free. all secondary glazing units come fully assembled and glazed, please do not confuse our product with diy kits, our product is good enough for the managers office of our local NatWest Bank and a £35,000 installation for Industrial Estates Scotland

What tools will I need to install secondary glazing?

Answer - the sub-frames are predrilled, so you will need a screw driver or better still a cordless.

Once again we must stress that the product arrives to you fully assembled, glazed and shrink wrapped.

If you require assistance call 01325 310520. or email info@secondaryglazing.com. Please Note: Quotations are only available via e-mail, however you can have as much technical advice via telephone from our technical department, who are always happy to help

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