Good surveying is the basis of ensuring a quality installation. Follow these points:
If the preliminary survey is satisfactory proceed to the measuring of the opening.
Measurements of the width of the structural opening at the top, middle and bottom of the window are taken. The smallest of these measurements are taken as the window width.
Similarly three measurements are taken at both ends and the middle of the opening. Again the smallest is used as the window height. It is good practice to deduct 10 to 12 mm from the minimum size of both width and height when measuring. This ensures a sufficient gap between frame and opening for installation.
In some occasions, usually due to subsidence. The opening can skew. It is good practice when measuring to measure both diagonals. Ensure that both measurements are equal to within 10 mm of each other. If not please seek guidance.
Note: When building work is being undertaken to house the window, do not build around the window in situ. But wait until the last possible moment before installing.
All glazing must comply with requirements of BS 6262, in addition recommendation from glass and glass unit manufacturers should be followed.
All glass and insulated units should be examined carefully for damage, especially at the edges, prior to installation. Defective Items should not be used. The size of the glass used for glazing must be such that both the necessary clearance between the edge of the glass and the base of the rebate, and also the necessary sealing joint gaps are present.
Recommendations for Glazing Procedure
The system designers recommendations should be followed.
Glazing gaskets, especially pressure wedges are prone to creep back which can result in unacceptable gaps at critical junctions. This can turn significantly and impair the performance of a window. All possible precautions must be taken and it is suggested that the following guidelines be considered:
Windows shall be installed plumb and square without twist, racking or distortion of the window to within stated tolerance to ensure correct operation after installation.
Pvcu window frames are manufactured accurately to specified outer frame dimensions and have specific opening light to fixed frame cleaners for operational efficiency. Distortion of any frame or sash member will reduce the performance, impair the operation and create a security risk.
Positioning of your windows is done on the back of your judgment. These factors must be taken into account when positioning:
When a thinner window frame replaces the original thicker one, it is customary to fit back to the existing plaster and make good externally. In cases where the new frame is much thicker, i.e. replacing steel frames, it may be necessary to remove plaster to ensure that the outside face of the new frame is fitted inwards of the building line.
All metal fixings such as lugs, screws and bolts should be of materials and finishes intended to offer the best corrosion resistance for the situation. They should therefore be made from one of the following:
Fixing methods should take into account thermal movement and will be influenced by:
Glazing blocks are essential to allow the windows to function correctly. The manufacturer's recommendation or block sizes, material and locations should be followed exactly. These are particularly important for side hung and tilt and turn windows.
Securing the glass
The glass or glazing is usually secured in place with glazing beads incorporating glazing gasket.
In certain circumstances it may be advisable to use sealing tapes or resilient sealants to severe the glass or glazing units, or to supplement the use of glazing beads. When these methods are used, the recommendation of the sealing tape or sealant manufacturers must be followed with regard to their use.
It is essential that the systems suppliers recommendations for securing the glass in place are followed. Specifically, care must be taken to ensure that glazing blocks or spacers do not obstruct drainage of the water from the glazing rebate.
Foam fixing offers a useful supplementary method of fixing where through frame or lug fixing prove impractical (for example at aperture heads). The technique requires skilled application to avoid problems of the frame distorting. Be sure to read and follow the manufactures instruction on using the foam.
Preferred fixing distances
Distance between adjacent
Fixings are chosen after careful consideration of all relevant factors. These are:
The purpose of the final checks is to ensure that the installation is of a high standard. It is advisable that, in the absence of any formal handover procedure, these checks are carried out in the presence of the customer. They should be that:
In general the maintenance of uPVC windows requires only that they are washed, and that the systems suppliers' instructions should be followed if any periodic lubrication of mechanism is required.
uPVC is particularly resistant to both marine and industrially polluted environments. Certain solvents, e.g.Chlorinated hydrocarbons will affect the surface of the uPVC. Rust stains cannot be removed by normal methods.
uPVC windows should be cleaned at periodic intervals to maintain their original appearance. The frequency depends upon the ambient atmosphere but as a general rule the frames should be cleaned whenever the glass is cleaned.
The best method of cleaning is to use a clean cloth and a solution of detergent, diluted to the normal concentration for washing-up. It is important to 'flood' the uPVC frame, and at no time rub the dirt with a dry or semi-dry cloth, as this might lead to micro-scratching of the surface.
Internal surfaces may be polished with a colourless silicone furniture polish after washing if required.
If a surface has been allowed to become excessively dirty, it should be cleaned as recommended above. If any unsightly stains remain, they should be removed using a mild household non-scouring cream, followed by washing.
Abrasive materials should not be used for any cleaning purposes as these can cause micro-scratching of the surface. Especially avoid the use of steel wool pads, as they might cause permanent stains.
Every care should be taken during installation to ensure that debris such as wet plaster, etc., does not foul drainage holes or impair the operation of the hardware. Internal reveals should be made good, ready for redecoration. When making good internally, the materials used should not be applied on top of existing wall covering materials, as the former would be removed during redecoration. Neither sand and cement or plaster should be used to fill the gap between the back of the frame and the structural opening. When it is necessary to seal internally, such sealants should be capable of accepting paint or wallpaper.
Wherever you come from, be it South Anglia or North Essex, Falcon Windows is the glazier of choice. We are pleased to offer the following glazing advice.
The glass used in most double-glazed units can be easily scratched and so we recommend that you remove hand jewellery prior to cleaning. Heavy external grime should be removed with a simple soap/water solution followed by the use of any proprietary household glass cleaner with a soft cloth.
Leaded glass cleaning
Extra care must be taken when cleaning leaded windows so as not to dislodge the lead from the surface of the glass. Warm soapy water applied with a soft cloth is adequate for cleaning leaded glass. Please note that external lead will oxidise this is a natural phenomena and cannot be avoided.
Scratches can be removed with jeweller's rouge or equivalent rubbing compound. (Ask your installer for further advice)
During the manufacturing process all double glazed units can be susceptible to a degree of surface damage, meaning that certain imperfections cannot be avoided, even in the most carefully controlled production environment. Such blemishes are inherent in all double-glazing and acceptable within the highest standards of the industry and are, therefore beyond our control. We use only the very highest quality glass available, whether laminated, toughened or float glass, all of which conforms to the requirements of BS6262. Double glazed units produced to BS5713 and BS EN 1279 (mandatory March 07), conform to the highest standards
Minor imperfections may still occur
The glass used originates in very large sheets and due to spacing repetition, centralisation of any design, in a specific window cannot be guaranteed. There is no correct direction for patterned glass - i.e. in general there is no 'right way up'.