Lancashire PVC-u Trade Frames Ltd, Preston, Manchester

Measuring
The position should in general:

Bridge the cavity by a minimum of 30mm
Cover the DPC
Be set back a minimum of 10mm in the opening

When replacing narrow windows (e.g. steel windows) with PVC-U, it is necessary either to cut back the plaster or to fit odd legs to the frame to ensure the ouside face of the window is set back from the building line. Ask us if you need help!

Pre-Installation Preparation
Prior to starting any work the installer should check the following:

The types of windows supplied are correct to the customers order and are undamaged.
Glass type and pattern are correct, and window and glass sizes are compatible
All cills, trims and gaskets are correct
Any furniture and fittings should be moved away from the working area
Carpets and soft furnishings should be covered with clean dust sheets
Check that the windows are not load-bearing. Ensure there is a lintel or suitable load-transferring structure above the window.

Fixing - Cill to building first
The cill is positioned in the aperture and levelled. It is bedded on either a sealant or mortar bed. A run of sealant is applied to the cill and across the ends before the window is fitted

Fixing - Cill to frame
The cill is cut to length (including the horns if required). A run of sealant is applied on the frame. The cill is fitted using self-drilling screws. Fit the screws 150mm from the corners and at 300mm centres. Avoid screwing at the mullions. Fit the cill end caps.

Position of window
The position should in general bridge the cavity by a minimum of 30mm, cover the DPC and be set back a minimum of 10mm in the opening When replacing narrow windows (e.g. steel windows) with PVC-U, it is necessary either to cut back the plaster or to fit odd legs to the frame to ensure the ouside face of the window is set back from the building line.

Through frame fixing
There are many types of suitable screws and plugs. The frame should be drilled and the inner face opened up to 13mm to allow cover caps to be fitted. Before final fixing of cills, windows should be positioned temporarily to check on the line of the cill and the window in relation to the structure of the building.

Dirty marks on PVC-U frames can easily be removed by using cleaning materials.

Cleaning cloths should be unbleached cellulose/cotton material. Do not use cloths containing synthetic fibres. Click here to see what you should use to clean any markings on your frames.

Any unacceptable scratches on white profiles only, can be removed by sanding and polishing. Sanding should be carried out using a 320/400 grit sanding disc and polishing using a sisal rotary brush to bring back the surface finish. It is important to achieve as smooth a sanded finish as possible before polishing.

If this is not done, there will be a visual difference between the surface finishes. Woodgrain surfaces cannot be sanded.

On woodgrain surfaces, care must be taken when cleaning. Any white areas showing, either through damage or cleaning, can be retouched using a woodgrain marker pen.

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