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PVCu Sash Windows – Frequently Asked Questions

When measuring the windows, how much of the frame can I fit behind the brick reveal?

The external face of the outer frame is the section in question here. This profile section measures 69mm which is 52mm of flat profile and 17mm of sculpted profile. You can put up to 40mm of the flat section of the profile behind your reveal but we would usually recommend 30mm each side.

Can your windows be installed into ‘listed’ properties?

To date the best result we have had is having permission to install them to the sides and rear of a listed property. Generally the consensus when asking about PVC windows is ‘no’ however it is always worth a try. If you find that you may require some additional information from Quickslide directly, please just give us a call. We will always do what we can to help.

Have you ever had your windows installed in conservation areas?

Yes. Conservation areas are sometimes a bit of a sticking point, but on the whole we have had great success. I am sure you will appreciate that each area is different and the majority of the time you are are reliant on one specific individual to give you green light but in our experience we do seem to be having more and more success. My suggestion however would be to go with a wood-grain finish, most conversation areas I have dealt with tend to like the white wood-grain finish opposed to the smooth white PVC.

I have purchased and installed them myself but how do I get a FENSA certificate?

Contact your local authority, tell them that you have changed the windows. They will arrange to come out and inspect and charge you a small fee.

What is the depth of your sliding sash frame?

The depth of our sliding sash window is 135mm from front to back (excluding the sill).

How do I know what sill to put on my sliding sash windows?

If you have an existing stone sill then usually our 150mm sill with upstand is the most suitable because it has no external projection. To check which is the most suitable sill then Please refer to the technical section or view the sill comparison document. Both of which have information which will answer your questions.

Can I have trickle vents and safety restrictors fitted post manufacture?

Yes you can but it will be costly. Both of these items are simply not designed to be fitted afterwards they must be included at the quotation stage. If you want to fit them afterwards then it would usually result in a new glazed top sash, so try to get this right to start with.

Where do I fit the D handles on my VS Window?

D handles are located to the outside of the window at the bottom of the top sash, screwed into the underside of the sash into the steel reinforcement using four screws. These then enable the top sash to be pulled downwards from the inside (once access is gained by tilting the lower sash inwards). One D-handle is fitted as standard for windows under 1200mm wide and is fitted centrally. Two are fitted as standard on windows 1200mm wide and over spaced equally –  max. of 300mm from corners. You can fit two to windows below 1200mm it would be personnel choice.

Where do I fit the Lift Hooks?

Lift hooks are located to the inside of the window at the bottom of the lower sash and placed 19mm up from bottom of sash. Screw through the sash into the steel reinforcement using two screws, these then enable the lower sash to be pulled upwards. One lift hook fitted as standard for windows under 900mm wide fitted centrally. Two lift hooks are fitted as standard on windows 900mm wide and over they need to be spaced equally – max. of 300mm from corners. You can fit two to windows below 900mm wide it would be personnel choice.

How do we attach the vertical slider to the structure?

You can use fixing bracket which can be purchased from our trade counter. We would recommend using 3 per side and across the top.  If you are using fixing brackets, these should now be firmly attached to the outer frame, starting at no less than 150mm from the corners and at no more than 600mm apart. The utmost priority of fitting the sliding sash window is ensuring that the sash window is fitted plumb and square into the opening cavity for the correct operation of the window. The other option would be to screw through the frame using standard Fischer type fixing screws.

Screw holes should be a minimum of 150mm and maximum of 250mm from each main frame corner with maximum centres of 600mm thereafter with a minimum of 3 fixings per jamb. Frames can also be fixed through the balance channels, but care must be taken not to distort the chamber when tightening the screws. To position a fixing in the top half of the window it may be necessary to remove the balances if access is restricted. Before final tightening, the frame should be packed at screw positions with approved shims.

My bottom sash arrived in the locked position but now it has been installed it will not lock correctly

The first thing to check is that packers have been placed under the cill directly under the jambs as this then allows the dead load to be transferred directly to the structure without bowing the cill which would then cause the sash not to locate correctly. If the lift hooks have not been fitted at the correct height this can also stop the bottom sash going down far enough and again stop the lock from engaging.

There is a gap between the frame and the astragal bar, is this correct?

There should be a gap between the astragal bar and frame to allow for movement if there was no gap then the bar would just pop of.
Required Gap: 0.8mm
Tolerance: +/- 0.1mm

Why do I have a haze on the glass in my windows?

A haze on the glass is usually an optical illusion caused by the sun shining on the glass at an oblique angle. It can happen at certain times of day and is caused by the sun reflecting off the energy coating on the inside of the glass.

Why do I have condensation on my windows?

Condensation is defined as the physical process by which a gas or vapour changes into a liquid.

With regard to windows and doors, it is the difference in temperature between the internal and external environment, and the glass, that causes condensation to form.

It is not a manufacturing fault.

For more information about our products, visit our collection of timber and PVCu sliding sash windows for Trade.