Step By Step Guide To Installing Windows

Energy Efficient Windows for Massachusetts Homes


A window does a lot – it lets in fresh air and warm sunlight, increases curb appeal and allows you to see the outside world from the comforts of your home. However, to enjoy all these benefits, you need to ensure that they are installed properly, or else they can become a source of energy loss. Here is an easy-to-follow guide to installing windows correctly in your home to ensure waterproofing and insulation. This DIY guide assumes that you can tackle this project.

Alside Window

Tools you will need

Some necessary tools that you are going to need for your window installation project include:

  1. Cordless drill
  2. Hammer
  3. Level
  4. Miter saw
  5. Pliers
  6. Tape measure
  7. Protractor

Make sure to take proper measurements of the space before you go ‘window’ shopping so that it perfectly fits into the wall opening. If you are replacing existing replacement windows with better quality or more efficient double or triple pane windows, the job will be simpler.

Inspect for any Damage

Before you start installing the new window, make sure there is no structural damage around its frame. If you see rotting jamb, broken frame, or any other type of damage, you first need to make repairs. Putting new windows into a weak structural rough opening or rotting sill is not a good idea.

Examine the Window Stop

It is a piece of wood that is placed on the outer side of the jamb. The window stop is used to keep the window from opening by sliding out on its own. If there was a window installed before in the space, you will have to see whether it is in usable condition. You may have to replace or repair it if it is not securely in place.

Check for Fit

Dry fit your new window before you apply silicone to the window stop to make sure it perfectly fits. If there are any fitting issues, you need to address them right away. Dry fit the window again to see whether it snugly fits into the opening. Don’t move forward until you are completely sure.

Alside Window

Install the Window

The installation process of the window is quite straightforward. Here are step-by-step instructions to perform the task:

  1. On the window stop, run a bead of silicone on its inside edge.
  2. Carefully slide your new window into place.
  3. Put a level across the window’s top side and press down cedar shims between the jamb and the bottom of the window frame to get the window sitting level.
  4. Check for plumb-ness – run your level on both sides of the window. It is very important that the window is level and plumb. This will ensure that there are no gaps around the window and that the window opens and closes easily.
  5. Generally, when you buy a window a hardware packet comes with it comprising of four screws to be fitted in the jamb. One screw goes near the bottom, one goes to near the top, and the remaining two are put on each side of the window. Pre-drilled holes will be in the window frame for fitting the screws.

Insulate the Window

A good insulating material for insulating windows is window specific spray foam. This specific spray foam will not put undue pressure on the window so that it becomes difficult to open and close it. Fiberglass can also be used, but it is not as insulating. Foam also holds the window securely into place in addition to the fastening screws. Around the original window frame, you will find gaps which you can use to spray the can foam.

Add Trim Molding and Extension Jambs

Select the type of molding that goes well with the décor of your home and build a frame around your window. You will have to measure the length of all pieces and cut the trim using a miter saw. Use the protractor to ensure the cuts are at 45-degree angles so that the trim fits together nicely. Using finish nails, attach the trim to the wall. If needed, add a jamb extension (i.e. thin strips of wood trim) inside the window frame for covering the gap between the drywall and the new window.

Final Touches

Fill any nail holes with paintable wood putty. Paint the trim molding to give your new window a finished look.

If you require professional window installation services or advice regarding insulation for your home, you can count on NEEECO. NEEECO installs Energy Star efficient windows (U-factor of 0.30 or lower) at the most competitive prices. NEEECO is a proud installer of Alside and Harvey windows. We also provides 0% interest loan to its window customers through the Mass Save® program.

Call (781) 514-5882 or contact us to get started with a no-cost Mass Save® home energy assessment.