This is an excellent, highly insulate material, which benefits from little or no external maintenance. It is readily available and well tested and is usually the lowest cost option of all three materials. It is mainly seen in white but also available in Mahogany and Oak woodgrain styles. PVCu is by far the most popular material for windows and doors today. There are many well-proven PVCu extrusions available. Problems with discoloration are virtually unheard of and most suppliers will warrant against this. The design of the windows varies from company to company. Here are a few of the main points. You may like to raise them with your supplier.

Internal or Externally glazed windows Most
Most PVCu systems will now give you this option. As a generalisation Internally beaded windows (where the glass is held in from the inside) are considered more secure and burglar resistant. That said there are a lot of satisfactory externally beaded PVCu systems about – many of which feature either internal wedge gaskets or a “double sided” tape which holds the external bead firmly in place. You should investigate this particular issue with your supplier.
Thickness of PVCu walling?
Most PVCu systems for window and door construction are “multi-walled” with internal reinforcement by means of either Aluminium or Galvanised Steel box section. Wall thickness can vary from system to system – most are around 3 – 3.5 mm thickness. Generally speaking the “thicker” the walling – the stronger the section. Ask your supplier for an example section and enquire if the frames are fully reinforced. Note also that the greater the number of internal walls – the greater the strength.
Depth or thickness of frame
Actual depth of frame extrusion varies from as low as 50 mm to a number at 70 mm and above. Most are in the 60 – 65 mm region. Clearly this does have an effect on the structural strength of your replacement window or door. This is especially worth bearing in mind when comparing prices. It would not for instance be fair to compare the price of a conservatory built using a 55 mm depth of frame with a window made using 70 mm depth of frame.
We bring the points above to your attention purely to give you a feel for the sort of questions you should ask a potential supplier. The above is by no means the whole story, and there will be varying arguments one way and the other. Here is a short list of PVC systems companies supplying extrusion for the manufacture of PVCu windows and doors: Rehau, Veka, Spectus and Synseal.
Coloured Frame Options
What colour do you want? You name it and today you can almost certainly get itStandard colours for PVCu and aluminium are white, whilst for hardwood it is a natural stain option such as mahogany, walnut or light oak. You can, however,have hardwood already primed in green, cream and teak plus a whole host ooptions to your specification. PVCu in mahogany woodgrain and cherry oakwoodgrain styles is also increasingly popular. Additionally, both PVCu and aluminium can be specially colored in red, blue, green, black and orange.
Buyers Tips – Top Design Tips
In this section we introduce you to some very important but often overlooked issues when choosing window designs. Regrettably we find that quite often some aspects of window design are not discussed at the buying stage.
One such issue is “equal sight lines”
When manufacturing most modern replacement windows it is normal for there to be smaller areas of glass wherever there are openings (sashes) fitted. Where the frames are fixed the glass area will be larger. This “unequal” site line is quite
normal and acceptable to most people.
However on a lot of older properties (and indeed some newer ones) it was more common to have an equal sight line. (i.e. you would not be able to tell from the outside which windows opened and which did not.) Fitting “dummy sashes” or “dummy openers” into the frames created this “equal” sight line.
Another design issue that is often overlooked is whether to use black gaskets or white gaskets on your white PVCu windows.
Consider your Neighbours
For instance if you and your neighbour both agree on a style for your windows the overall effect can be considerably better if you both agree to use similar designs. It doesn’t matter if you both use the same company or even have the
work done at the same time.















































