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Replacing Window Casing

January 29, 2010 at 12:25 pm | Category: Remodeling Contractor



Replacing your windows can bring numerous benefits to your home. Not only will they look nicer and add value to your property, but you can also gain significant energy savings. Most new windows are now heat and cold efficient and will greatly reduce the amount of drafts coming in as well as UV rays. If you’re ready to get started, you’ll need to get some tools together first. You’ll need the following: crowbar (to remove old window), power sander or rough grade sandpaper, screwdrivers of varying sizes, pliers (just in case), gloves, insulation (either blow in or standard), clamps, wood shims, paint, plastic sheeting and either screws or wood glue depending on how your new windows will be installed.

IMPORTANT: Always measure your windows and casings before you attempt to replace one. It is a lot easier to take care of size issues before you’re left with a big hole in the wall. Take the time to make sure that everything lines up BEFORE you do any replacements. Also – it is a good idea to make sure that the area where you will be working has the electricity turned off. This is very important – you could accidentally cut a wire while you are removing the old window. No one enjoys being electrocuted! Take the time to be safe and take the right precautions.

Before you can install the new windows, you’re going to have to remove the old ones. First, you’ll need to remove the window itself, taking special care not to break the glass. Remove it and place it aside in a safe place. Now, you’re most likely going to need to remove the window casing so that your new window will fit properly. Either unscrew or use that crowbar to pry it apart. You should be left with an empty hole. Sand the edges down to make sure the new casing will fit.

Now that you’ve prepped the wall, you can insert the new casing. You will most likely need to refer to the installation instructions that came with your new window, since most are different. Generally however, you’ll need to attach the new casing with either screws or wood glue. If using glue, make sure that you also clamp the casing and give it time to dry before installing the window. If necessary, use the plastic sheeting to block the hole until the glue is dry.

It is a good idea to fill any gaps with insulation. If the gaps are large, you can use regular insulation, but most people prefer the spray type that comes in a can. It will expand after you blow it into the holes, so don’t use too much. Cut off any excess after it is dry and sand the area down. You may need to further cover this with wood if the gap is large. If not, you can paint over the area to match your walls or your home’s exterior.

Once your casing is ready, you can begin installing the new window. Most will slip into the grooves that are on the casing, but it may take a little time to line everything up. Remember, be gentle and never force the window into the casing. You risk breaking the glass and having to start all over again. After the new window is installed, make sure it works properly and you’re all set.


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