How Are Windows Made?

While almost every home built in the last century incorporates windows, few people take the time to learn exactly how their windows are made. At Renewal by Andersen, we have been the gold standard in window replacement since 1903. With more than 2 million windows replaced over that time, our team of certified window installers is well equipped to answer any questions our customers might have. Here, we walk through the manufacturing process to explain just how windows are made.

Molding the Glass

Modern windows are made from float glass. Float glass is also known as Pilkington Glass, named after Sir Alistair Pilkington who pioneered the method in the early 1950s in England. Float glass uses the common raw materials that have been used in glass manufacture for centuries. Sand (silicon dioxide) makes up the main input, with smaller amounts of sodium bicarbonate, lime, and possibly colorants or refining agents, depending on the type of glass. The glass is super-heated into liquid form and poured into a bath of molten tin. The glass flattens under its own weight to an entirely smooth surface of even thickness. Slowly, the glass in the bath is cooled until it hardens enough to be lifted onto rollers. The glass is further cooled gradually and tempered to prevent cracking. Once the glass cools and hardens enough to be handled, it is machine-cut to the desired specifications.

Constructing the Frame

At Renewal by Andersen, we offer window frames made with our revolutionary Fibrex® material. Fibrex® is a composite of wood and vinyl that blends the two to give the customer the best qualities of both. One of the benefits of Fibrex® is that it can be extruded, meaning it is fluid enough to be cast in an injection mold. This gives us the freedom to make window frames in a wide array of sizes and shapes without too much downtime between types. Our frames are injection-molded around pre-cut pieces of glass, ensuring a tight seal and precise fit every time.

Delivering the Finished Product

Of course, once the glass is in the frame, the finished product still needs to be installed in the home. Our expert window installers walk our clients through the entire process and explain every step. When it comes time to put the windows in place, we protect the surrounding area with drop cloths and plastic sheeting before vacuuming up at the end of the job.

For 114 years, people have trusted Renewal by Andersen for all their window replacements. Our window manufacturing process results in a durable, beautiful, and affordable product that will look great in any home. Contact us to schedule a free in-home consultation.