We are here for all of your glass block needs. We offer both residential and commercial solutions for basements, bathrooms and security windows. We only use American-made Pittsburgh Corning Glass Block. We will beat any written estimate! Call now for more information 410-788-4700. You might think glass block windows are an architectural feature from the past. But their energy efficiency, value, good looks, and security enhancement remain highly valued qualities. Glass Block or Baltimore uses type S mortar, which is specially made to adhere to glass block. Glass Block of Baltimore prefabricates its windows by laying them on a level pouring table. This allows us to use a stronger mortar to insure a full mortar joint between every block. This provides strength and durability in our windows, which are GUARANTEED FOR LIFE. After more than 29 years in business, we have satisfied more than 50,000 customers. Heres what a few of them had to say about us. Glass Block of Baltimore has been installing windows for over 29 years. We have the most qualified installers with over 60 combined years of experience. We can either install the whole job for you or we can prefabricate windows to install yourself.