Glass block basement windows seem pretty simple to make: take a few blocks, mortar them together, remove a frame, and then place them in the opening. However, like most skilled trades, it looks easy when done by a professional who is armed with the tools and tricks of the trade. The key to a successful basement window remodeling project is having a logical process for completing the job.
Learn 7 steps to get this job done right the first time.
Step 1) – Determine what the foundation is made of and take your measurements – Most foundations have masonry openings made from poured concrete or concrete block with occasional wood frame openings (this is most common in basements where the level bottom is above the ground level of the surrounding terrain). For masonry openings, measure from the top of the sill to the bottom of the header. For a frame opening, measure the area that will exist after the window frames are removed.
Step 2) – Evaluate the need for blocking vents and a dryer vent. It’s always best to maximize airflow and ventilation for a healthy, mold-free home. Vinyl framed energy efficient vents can be added to create an operable window within a safe glass block panel. Fully removable dryer vents, exhaust fans and sash windows are also available.
Step 3) Consider colored and etched blocks for styling – Your block window doesn’t have to look like everyone else’s – add styling, design, colors and tinted blocks. A project in Alabama used a downspout color block window instead of stained glass to increase safety against high wind loads. Additionally, block faces can now be engraved with custom images or standard patterns to match your personal interests, hobbies and tastes.
Step 4) Order Precast Glass Block Panel with Mortar or Silicone Gasket – Precast glass block window assemblies will save you time, money and improve the quality of your finish. The decision between silicone and mortar gaskets is based on personal taste and which processes finish the window size that best fits your particular window openings. The main advantages of mortar joints is the ability to vary the size of the joint and the traditional look that blends well with brick veneer and block foundations. The main advantages of silicone gaskets are that they can be placed in tighter openings and also in the glass aspect of the panel. If you are unsure about the best fit for your home or building, call a window manufacturer that specializes in blocking with your opening sizes for recommendations on the best joining process.
Step 5) Remove the frame and/or frame from the old window. On masonry basement windows, remove the frame and sash from the window. This is best accomplished by first removing the sheet and then collapsing, cutting, or grinding the old frame with a pry bar, saw, or grinder. For frame openings, in most cases, you will only remove the sash.
Step 6) Set the window level and plumb and wedge it securely into the opening – Place the window in the opening and use a level to ensure proper placement. Next, use a wooden window wedge to hold the precast panel in place.
Step 7) Secure and Seal Window in Place: For masonry openings, add water to premixed block mortar mix (these are available in 50 pound bags), mix with a hoe or trowel and fill in sides, the top and sills (this can be done with a piping bag or pointed tool). For frame openings, use spray foam insulation between the block panel and the window frame, then install wood bumpers around the panel as needed, and then install aluminum or PVC coated coils over the wood frame abroad.
If you’re still not sure if you want to tackle a glass block basement window installation, call your specialty contractor for an estimate.
