How to fit your own double glazing

Replacing your old and worn windows is a wise move. Not only will you be able to save a small fortune on your energy bills, but you’ll also be able to bolster your home’s security with modern multilocking systems.

Most people will opt to bring in a professional window installer for their double glazing, but if you’re a handy DIYer, you may fancy taking on the task yourself.

Why you will save money on the installation if you get it right, a word of warning that you could end up paying out a lot more for repairs with ill fitting.

This is only intended to be a rough guide for installing your own windows, so if you really do decide to go ahead it’s worth seeking professional expertise and advice.

Fitting double glazing

If you want to install your own double glazing window you’ll need:

  • Drill
  • Chisel
  • Screwdriver
  • Scoring blade
  • Spirit level
  • Frame fixings
  • Silicon sealant

An extra you could also require is a saw to trim the sill and provide a tidy finish.

Before you even think about removing the old windows, make sure to measure the replacement and the space it’ll fill to be certain it will fit. When you’re happy with the measurements, score between the wall and the window frame to break the bond. Not only does this make removing the window easier, but will also prevent you pulling off plaster.

Now you need to remove the old fixings and break the external silicon sill. Remove the external brick corners and the old frame will come out of its place. clean any debris and sealant left behind so it’s a smooth finish ready for the new installation.

Screw the sill to the bottom of the window frame and seal the ends to prevent moisture getting into the brickwork. A window sealant is sufficient here.

Now you want to position the frame into the gap left behind from the old window. It’s an awkward job so always handy if you have someone around to help you at this stage. Once it’s centred, put packers underneath to level it and maintain the 5mm extension gap.

Once you’re confident it’s level and flat, drill at least two fixing holes on all four sides of the frame. Drill holes should be approximately 150mm from top and corners and around 600mm centres in between.

Nylon sleeve frame anchors or self-tapping masonry screws are suitable for this job. Use more packers around the frame and break of any excess length with a chisel.

Now you’ll be ready to put the window pane into the frame and with a hammer you’ll be able to tap the beads into place. Make sure everything is nice and clean before sealing the gap between the frame and internal window sill.

Tom Crosswell

I have been managing online projects since 1999 and I'm a experienced marketeer, who is well versed in international brand management, online business strategy and developing long term relationships. Through my academic and professional background I am a specialist in generating online loyalty towards brands. My experience has taught me that ultimately business is about relationships and people. For more information see my Google+ page.

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