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Top-Rated Glass block installation pros in Cedar - Updated Nov 2026

Avatar for Northern Exteriors Company, Inc.
Northern Exteriors Company, Inc.
New to Angi
Glass Blocks - Install

Serving Cedar, MI and surrounding areas

In business since 1958

Northern Exteriors Co., Inc. has been in the home improvement business since 1958. We carry workman's compensation, liability insurance, and our craftsmanship is second to none. We here at Northern offer something never seen in the construction industry, a LIFETIME warranty on our labor! Our work entails: job supervision by an owner every 3-5 days, our windows carry a LIFETIME warranty, and the jobsite is thoroughly cleaned and trash is hauled away. When we start a job, we stay on it until it is completed within a reasonable amount of time. We are members of the Kalkaska, Gaylord, and Grand Traverse chamber of commerce. We are also members of the North Central Michigan Home Builders Association. All of our work is repeat or referral from satisfied customers. We warranty all of our labor with the exception of roofing for life! Our roofing carries a 12 year warranty!

Glass Block Windows FAQs, answered by experts

Glass block windows aren’t fire hazards; fire-rated glass block windows can increase your home’s fire safety. Modern glass blocks are made with materials that can resist high temperatures and prevent fire spread. Most offer a 45-minute fire rating, while some increase it to two hours. Compared to the typical 20 to 90 minute rating for a double-pane window, glass block can increase your home’s safety in the event of a fire.

Their thickness depends on application, but most glass walls are typically 3/8 to 3/4 of an inch thick. Although it’s not as common, single panes of glass can also be 1 inch thick.

You can still see vaguely into some types of glass block windows at night. Although there won’t be clear definitions, passersby may still see shapes, shadows, and movement through the glass. If you want complete privacy, consider installing diamond glass block windows rather than the typical clear or wavy glass blocks.

Glass block mortar is the best choice for glass block window units. It is specifically formulated for glass block window installation. Glass block mortar is usually a mixture of Portland cement, sand, and special chemicals. It is a white mortar that is applicable inside and outside your home. Do not use regular tile mortar because it may not have the binding strength and flexibility required for glass block windows.

Most installations take 1-3 days, depending on the number of blocks and customization requirements.

The Cedar, MI homeowners’ guide to glass block window services

From average costs to expert advice, get all the answers you need to get your job done.