STRUCTURAL GLAZING WORK PROCEDURE – GLASS FIXING, TYPES, PRECAUTION

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Structural Glazing work procedure glass is fixed to doors and windows for diffused lighting, for privacy, and as a decorative feature of the building. Varieties of glasses are available in the market. of these, obscured glass and plain glass are used most often in building construction.
In this chapter, we will discuss the types, quality, and handling of structural glazing work procedure glass. We will also study the quality of fixing material, workmanship, precautions to be exercised, and the mode of measurement.
STRUCTURAL GLAZING WORK PROCEDURE GLASS FIXING
STRUCTURAL GLAZING WORK PROCEDURE GLASS FIXING 

 

TYPES OF STRUCTURAL GLAZING GLASS

  1. Obscured glass
  2. Plain glass
  3. Tinted glass
  4. Wired glass
1. OBSCURED GLASS


Pinhead (Bajari), flora (tomato), chameli, and pyramid are the different varieties of obscured glass. Bajari is the most popular and is commonly used for glazing.
 

It is not transparent and allows light ventilation as well as privacy. One side of this glass is plain and
smooth. The other side is rough in texture like fine food grains as “Bajari”: giving it the name Bajari glass. It is available in 3mm, 4mm, and 5mm thickness.
 
The exact thickness of the glass is mostly unavailable, always being on the minus side, to an extent (measured in mm). The glass sheets are available in the size 120cm x 180cm and 120cm x 210cm.

2. PLAIN GLASS 

Generally, plain glass is used for aluminium windows and M.S. windows. It is available in thickness varying between 2mm to 19mm, like 2mm, 3mm, 4mm, 5mm, 5.5mm, 6mm, 8mm, 10mm, 12mm, 15mm, and 19mm. It is completely transparent. A variety of plain glass is available. Both sides of the glass are plain and smooth. It does not allow privacy unless specially treated.

3. TINTED GLASS
 

Tinted glass is most often used for aluminium windows. It is available in the same thicknesses as lain glass. Privacy may be gained with this glass.

4. WIRED GLASS
 

It is manufactured by rolling molten glass with a steel wire mesh that is embedded in it. This glass is used in fire break doors and in roof glazing because the wire mesh holds the broken glass together and so minimizes the danger of the glass breaking into pieces.

STRUCTURAL GLAZING WORK PROCEDURE – GLASS FIXING (BAJARI PLAIN) TO M.S. WINDOWS

  • Check all the windows for its straightness and, bends, fixity, rigidity in fixing, etc.
  • Before fixing the glass, ensure that all the work inside the flats is complete. A coat of distemper painting should also be complete to minimize the chances of breakage of glass.
  • Ensure that the window is properly scraped, cleaned, and painted with a coat of oil paint.
  • The measurements of glass panels should be taken at the site.
  • Glasses are cut to the required size and brought to the site for fixing.
cutting of glass
cutting of glass

 

  • Check the glass for thickness and quality as per the ordered specifications.
  • Check the glazing clips and putty (lambi) for quality and brand.
  • Glass is fixed in the panels from outside, with the help of a ladder or zula for external windows.
  • Glass panes should be perfectly cut to match the size of each panel. Ensure that the fitting is not loose.
  • Cut the glass using a glass cutter with a diamond point. 
  • M.S. clips are fixed to support the glass in T/Z section.
  • See that clips are fixed in every hole.
  • Apply the putty to the corners of the panels. Quality of the putty is important. The roll should be prepared by using whiting to get a consistent uncracked filling.
  • The putty should cover the M.S. clip.
  • Cut the putty at an angle, i.e., about 45 degrees to glass. 
  • Smooth the surface of the putty with a cut piece of glass.
  • After the putty is dry, the final coat of oil paint should be given.
  • Clean the window glasses with wet dusters paper to remove paint stains.

 

1. STRUCTURAL GLAZING GLASS FIXING TO ALUMINIUM WINDOWS
  • Generally, plain glass is used for aluminium windows.
  • Check the tracks of aluminium window for its level straightness, the width of the track, smoothness of track, etc.
  • Cut the glass as per the required size.

 

the procedure of glass fixing

 

  • Provide rubber packing strips on edges of the glass and prepare the panel to fix in the track.
  • The required size of the glass should be less by 2 mm than the size of the panel.
  • Fix the panels on track and check it for free movement. It should not shake considerably prepare the panels to fix in the track. across the track.
  • Clean the glass with a cloth or paper.

HOW TO FIXING STRUCTURAL GLAZING GLASS

 

2. STRUCTURAL GLAZING WORK GLASS FIXING TO WOODEN WINDOWS
  • Ensure that one coat of oil paint is applied to the wooden window.
  • Measurements should be taken on site.
  • Fix the M.S. grill, if any, before fixing the glass panel and two coats of oil paint.
  • Ensure that the beading patti on one side of the panel is applied rigidly (on which M.S. grill is fixed) and keep the other side of the beading patti loose.

 

procedure of glass fixing wooden frame
procedure of glass fixing wooden frame

 

  • Remove all the loose beading pattis. 
  • Fix the glass panel in the space touching the other side of the fixed beading pattis.
  • Then fix the beading patti on the other side carefully with panel pins to prevent the glass from breaking.
  • Clean the glass with cloth paper.

3. STRUCTURAL GLAZING PUTTY (LAMBI)

Glass is fitted to the window with putty. It ensures that the glass remains in position. Putty is made by mixing one part white lead to three parts of finely powdered chalk. boiled linseed oil is added to this mixture to form a stiff paste of the desired consistency. Readymade putty is available easily in the market under brand names Brite, Shalimar, Kumb, etc.

Following precautions should be taken while or using putty for glass fixing

  1. Mix the putty at the site with linseed oil and form a roll for better consistency.
  2. Ensure that the second coat of oil paint is applied after the putty is in a semi-dry condition.
  3. Finishing of the putty should be made smooth with glass cut-piece.
  4. Ensure that a sufficient quantity of putty is applied to every panel.
  5. Before applying putty, ensure that glazing clips are fixed in every hole provided in the frame.
  6. The position and tension of each glazing clip should enable holding the glass in position.
  7. Ensure that glass size is not undercut.
  8. Use a glass diamond cutter to cut the glass of the required size.
  9. Do not disturb the glass panes when the putty is wet.
4. STRUCTURAL GLAZING WORK MODE OF MEASUREMENT
 

Glass is manufactured in standard sizes of sheets. As per the requirement of window panels, the glass has to be fixed. This causes wastage of glass.

Usually. the mode of measurements in the market are in multiples of 7.5cm (3″) for glass panes up to 60cm (24″) and in multiples of 15cm (6″) for glass panes above 60cm (24″), e.g.

Actual size of glass for window panel

40cm (16″) x 55cm (22″)

70cm x (28″) x 65cm (26″)

 

Actual payment to be made.

45cm (18″) x 60cm (24″)

75cm (30″) x 75cm (30″)

 

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Akshay Kamble
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