With the improvement in design and manufacturing processes, uPVC sash windows can offer wood-effect surface finishes that give the window a remarkably authentic appearance. Combine this with an extended choice of colour and you have an excellent alternative to timber sash windows that is well worth considering. The durability really depends on how well you maintain your windows. If a sash window is well maintained and looked after, it could easily last in excess of 25 years.
Our Sash Windows are made of the highest quality materials that are designed to last and we are happy to advise on the correct maintenance procedures. In terms of visual appearance, there will be very little change with the new Sliding Sash Windows — this is unless you opt for a different look!
The frames of your windows will be the same thickness as they were original although there will be small differences in the molding on the outside and the inside bead. We will ensure that your new purchase is the perfect fit for your home, retaining the features and designs that make your windows double glazed beautiful.
But if you look for a new sash window with secondary glazing we recommend replacing the existing sash in order to obtain a better performance and lasting durability.
Double glazing itself is known for being energy efficient and minimize heat loss a but the overall energy efficiency rating of your home will also be dependent upon a number of factors including wall and loft insulation, the installed heating systems, and the roofing material.
The windows, however, are a key factor in a house's overall energy cost-effectiveness rating, as they keep the cold and the wind outside as well as they are draught proofing, thus offering incredible performance. Installing windows sash could help you save on your energy and heating bills. Double glazed sash windows will also help the environment as you will have less need for heating systems when you have double glazing, so these new windows will reduce your energy consumption, due to their overall performance.
Reduces Energy Usage. These sash windows are well known for being highly energy-efficient because they seal very well due to their double-glazed. The sash window presses directly against all four sides of the frame of the window, forming an airtight seal that prevents air and cold spots from entering your house, providing incredible efficiency and guaranteeing draught-proofing. Reduces Condensation. Double glazed windows limit air intrusion into your home and due to their incredible performance reduces condensation.
Reduces Noise. Since the glass of this type of window has two glazed units, noise reduction is just one of the many advantages of secondary glazing. Increases Security. All of our sliding sash windows were proved to resist physical attack by a burglar by being sufficiently robust. Moreover, the glazed units are harder to break, thus improving the security. Improves kerb appeal to enhance property value. This unit is of exceptional quality and has not been bettered by Pilkington in around 8 years.
In the event your sashes are thick enough to carry this unit the value for money is incredible. Thinner sashes may require a double glazed unit as slim as 4mm Low E — 4mm Air Gap Argon Filled — 4mm Clear Float 4mm-4mm-4mm , which is not as effective for sound proofing or heat retention as a larger unit 4mm-8mm-4mm , however that said, a normal person will not be able to tell the difference in noise or heating between the two.
If we were to use a fancy dB meter for volume then, the 4mm-4mm-4mm would not be as technically effective as the larger unit 4mm-8mm-4mm , and although the difference would be noted on a U-Value meter for sure — the real heat loss would be unnoticeable on your gas bill. Double glazing is double glazing after all. This depth will allow a 4mm-6mm-4mm or 4mm-8mm-4mm double glazed unit. To install the double glazed unit neatly, we need to make the sash rebate deeper to hold the glass properly. Because we do not rebate the internal decorative profile, we do not disturb the mortice and tenon and therefore the structure of the sash remains good.
By reducing the external glazing bead to a minimum depth we can minimise the impact structurally on the sash.
The end result of double glazing the original existing sash windows is exactly the same as manufacturing sashes of equal depth, only with considerable saving your end and the luxury of retaining your original joinery. Here is a look at the cross section of the original sash:. To allow for the double glazed unit we must rebate the glazing profile more deeply using a specialised router cutter on a work bench.
We then install the double glazed unit into the deeper rebate and rebuild the window with a draught proofing system. Here is a look at the sash close up after being installed.
It clearly needs a little tidying decoration wise but certainly no worse for wear. To have any idea the sash window is double glazed we need to look inside the sash to see the white space edge of the double glazed unit.
Looking at the sash window straight on you would not know this sash window has been double glazed. Pictured below is a 40mm sash with a Argon filled unit. Similarly this technique can be applied to a more traditional Lambs Tongue profile. Some might argue the finish looks better but please feel free to take a look at the image below and decide for yourself.
Please note that this sash window has not been decorated as the client wished to decorate the sashes themselves. This represents an excellent saving if you are DIY capable.. We will happily spend some time going through with you on the best technique to do so. I have also written a DIY sash window painting article to help our clients that wish to make this saving.
Replacement double glazed sashes making use of the original frame is the second most best solution in terms of cost, and being sympathetic to your period property. We will measure sashes and take note of the original profiles as well as external horns. We will then manufacture wooden double glazed sash windows to match the originals. The service is almost identical to double glazing original existing sash windows with the exception we supply a new sash instead of making use of the original joinery.
There are some added benefits of replacement to note. We can tinker with profile sizes and this allows a much larger sealed unit to be installed. If we were to manufacture a standard 22mm they would of looked chunky and unattractive. The bars in this image are 18mm and though 4mm sounds like an insignificant amount, if manufactured larger would completely changes the aesthetics of this window. Below is our hand crafted double glazed sash window replica installed into the original frame:.
Our double glazed sash windows are built with a solid glazing bar construct inside, and then we laminate the glazing bar externally, giving the overall effect of a sash window that has many panes of glass. We feel this construct gives a better looking, more traditional feel. With the glazing bar taken care of and the glass sight lines accurately replicated, we also try to keep the stiles to an absolute minimum as well, This helps the overall feel of the window and helps maintain that authentic look.
Traditionally, and very typically, these are constructed between 44mm and 50mm. We install a concealed draught proof system at the same time, further improving the energy efficiency of your property. Once the new window is in place, we prime all exposed woodwork and caulk the beading, leaving the window ready for painting. Finally, a centre catch, uplifters, D rings and window locks are fitted, and you will be provided with a full operational demonstration and advice on how to look after your new double glazed sash windows.
Windows are a key element of the visual appeal of a home, and nowhere is this more apparent than in period buildings in Conservation Areas where unique and distinctive architectural features are protected by law. Timber sash windows are an important part of our British heritage and, as such, it is right that they should be preserved wherever possible.
Many homeowners believe that double glazed sash windows cannot be fitted in Conservation Area homes or in listed building, but this is not strictly true. This eventually causes the weight to become disconnected and the windows drop out of position.
Happily, modern versions for replacement windows have resolved all the issues by means of spring loaded tensioners instead of weights and smooth operation of the guide track in the frames. To begin with, it may be worthwhile to consider if refurbishing your existing sashes is a viable option.
Adding internal secondary glazing is an option that has been successfully used many times in many homes. Broadly you have 3 primary designs: Single hung where one window section moves usually the bottom one — Double Hung , where both window sections move — Horizontal , where the windows move side to side. In addition to this you could be looking at Box Sash windows , usually made from timber in a traditional appearance or Slimline sashes which are prominent in uPVC Sash Window units.
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