You will need Adobe®
these tips and instructions on how to remove and replace broken window glass can
help save you time, money and effort. Inside this document you will find information
- Preparing for the New
- Installing New Glass
- Adding the Finishing Touches
Glass on Doors
1 - Wear heavy work gloves and use care when removing broken glass.|
2 - Use a chisel or knife to remove old putty.|
3 - A heat gun or soldering tool can make it easier to remove old putty.|
4 - On old windows, brush a coat of linseed oil on all wood surfaces before
applying new putty.|
5 - Apply a very thin layer of putty around the fram before installing new
FOR THE NEW WINDOW GLASS
and replacing windowpanes is not a difficult job, doing the job right requires
a certain amount of attention and skill. There is a lot more to it than just inserting
a new windowpane and adding a little putty.
can use the instructions here for a windowpane of almost any size. However, if
the windowpane is a large one, you should remove the complete window frame and
place it on a flat surface before attempting to remove the broken glass or to
install the new glass.
- The first
step is removing the broken glass. Use care on this phase of the jobobviously,
broken pieces of glass can be very dangerous. Wear work gloves to protect your
hands while removing the broken pieces of glass from the frame.
- A shattered windowpane can be removed quite easily
(Fig. 1). Pull one broken piece out at a time. Be sure to wear protective gloves
while doing this. Don't take chances!
the glass is only cracked, you may need to remove most or all of the putty in
order to take out the broken glass. Regardless of which way you do it, use extreme
care to protect your arms from cuts.
remove the old putty from the window frame. You can use a wood chisel, a putty
knife or a jackknife (Fig. 2). Take time to remove every trace of the old putty.
- Break the old putty into little pieces
as you remove it. If you try to remove too much putty at one time, you may split
the wood frame on the window.
all the glazier's points as you remove the putty. Glazier's points are the small
metal triangles driven into the frame underneath the putty that hold the glass
- Some putty may be extremely
difficult to remove. If this is the case, you can use a heat source such as a
heat gun or soldering tool to soften the old putty, which makes it much easier
- Run the heat source
along the putty just ahead of your chisel (Fig. 3). The heat will soften the putty.
This allows the putty to pull away from the wood frame much more easily.
- Take your time when removing old putty,
since this is an important part of a glass replacement. By using heat, a good
putty knife or chisel, and a little patience, you can remove even hardened putty
that is well-set quite easily.
completely removing the old putty and the glazier's points, use the point of the
chisel or the knife to smooth out any rough spots in the wood frame where the
new glass will be inserted.
you are replacing glass in an old window, take a small paintbrush and apply a
heavy coat of linseed oil to all sections of the wood around the frame (Fig. 4).
Allow the oil to completely soak in.
oil on the frame helps keep the oil in the putty from soaking out, which causes
the putty to dry out quickly. If you saturate the wood with linseed oil before
applying the putty, the new putty remains pliable and lasts much longer.
- While pure linseed oil works in most cases,
check the label on the putty you are using. The manufacturer may have another
- After you have
removed the old putty and applied the linseed oil to the frame, apply a very thin
layer (about 1/16") of putty completely around the frame where the new glass
will be set (Fig. 5). Make sure the base layer of putty is not too thick.
- This thin layer of putty on the window
frame provides a cushion for the new glass to be inserted in. This cushion also
stops the leakage of air around the glass and prevents it from resting directly
against the wood.
6 - Press the new glass firmly into the putty bed.|
7 - Insert a glazer's point about every 4" around the new glass. |
8 - Roll the putty into pencil-sized strips and lay it all around the glass.|
9 - A combination glazing tool can make applying the putty easier. |
10 - Smooth the finish on the putty with a putty knife or scraper/glazer.|
11 - The new putty should be shaped somewhat as shown.||
- Now that you have
removed the old putty and the frame is ready for the glass, you can insert the
replacement glass in the frame.
replacement glass must be exactly the right size. If it is not, cut it to size
with a good glass cutter. The new pane should be just a fraction of an inch smaller
than the window area it is to fill.
the new windowpane into the frame carefully (Fig. 6). Press it down firmly.
- Hold the new pane in position with
one hand and insert a glazier's point on each side to secure the pane firmly in
place. The glazier's points can be inserted with only a small amount of pressure.
- Insert additional glazier's points
about every 4" apart, completely around the new pane of glass (Fig. 7).
- Lay each glazier's point flat against
the glass and start it into the wood with the point of the combination glazing
tool or putty knife. Then, use the glazing tool to drive the glazier's points
into the wood.
- Slide the glazing
tool along the glass to eliminate the danger of breaking it. It takes only a light
blow to drive the small glazier's point into the wood.
sure to keep the glazier's points firmly against the glass wherever they are applied.
- Putty should be the consistency of
rather dry, thick dough when it is applied. If it is too stiff, thin it down with
the manufacturer's recommended thinner.
can use an old piece of glass as a kneading board for working the putty into the
right shape and consistency.
the putty until it is completely pliable and free of lumps. Then roll it into
- Take a roll
of putty into your hands and start applying it in one corner of the window frame
(Fig. 8). Lay the strip in the frame completely around the new piece of glass.
- When the putty is completely in place,
smooth it out with a putty knife or scraper/glazer using long, even strokes.
- Hold the glazing tool at an angle
and be sure it is clean. Any corrosion or rust on the knife will make it difficult
to do a smooth, neat job.
glazing tool will work better if you dip it into a can of linseed oil just before
using it to spread putty.
long, corner-to-corner strokes with the glazing tool Don't spread the putty so
far out on the new windowpane that it is visible from the other side.
- A combination scraper and glazer tool
makes the job of glazing windows even easier (Fig. 9). The angled blade rides
along the front surface of the window as it forms the bevel on the putty. The
other end of the tool is a scraper for removing old putty.
you use a putty knife or a scraper/glazer, it may be difficult at first. However,
with a little practice, you can smooth out the putty completely around the windowpane
(Fig. 10). Keep smoothing until the putty takes on a neat, finished appearance.
- Study Fig. 11 to see how to place
the putty on the frame. It should cover the glazier's points, which are illustrated,
and be set at an angle so it holds the glass firmly in place without showing from
the opposite side of the window.
completely around the area puttied, and remove any excess putty in corners or
along the edges.
- A fine grade
of sandpaper may be helpful in eliminating rough spots.
12 - Allow the paint to flow out onto the window.|
13 - To clean up, run the scraper about 1/8" from the edge of the putty.||
THE FINISHING TOUCHES
the label on the putty you are using for painting instructions. You may be able
to paint the putty right away or you may have to wait. This depends on the manufacturer's
- Use at least
two coats of outside paint for a good job.
of the easiest ways to paint window frames is to allow the paint to cover not
only the putty but also part of the glass. Don't worry about straight edges (Fig.
- Use a razorblade scraper
for removing the extra paint from the glass. Run the scraper about 1/8" away
from the edge of the putty (Fig. 13). Be careful not to gouge the putty.
- There are products that when applied to
the glass before painting make removing the excess paint easier.
- Make sure the putty left over from your job is
kept airtightit will remain usable for many months.
14 - Door glass is usually held in place with wood strips.||
GLASS ON DOORS
- Although most
window glasses are held in position with putty, the glass on many doors is held
in place with thin wood strips (Fig. 14). Building code in most areas requires
safety glazing materials in entrance doors.
the pane of glass on a door is broken, you can remove and replace these wood strips
- First, pry out
the strip on the long side using a screwdriver, a putty knife or some other prying
instrument. Always remove the long side first. After removing one strip, the others
will come out easily.
- After the
strips are removed, use a pair of pliers to remove the small brad nails or to
pull them through the wood strips.
your state and local codes before starting any project. Follow all safety precautions.
Information in this document has been furnished by the National Retail Hardware
Association (NRHA) and associated contributors. Every effort has been made to
ensure accuracy and safety. Neither NRHA, any contributor nor the retailer can
be held responsible for damages or injuries resulting from the use of the information
in this document.
for Other "Show-How" Instruction Sheets
instruction sheets for home do-it-yourself projects are available from your local
supplier of materials. Come in and ask for "Show-How" instructions when
you get ready for that next handyman project!