Norm finds Tom installing exterior trim that looks like wood but is actually cellular PVC and therefore resistant to rot. Inside, Kevin finds Jeff finalizing the lighting plan with master electrician Allen Gallant. In the future sunroom, Kevin lends Norm and Tom a hand installing the new clad windows that look just like Janet's traditional wood windows on the main house. At a Menomonie, Wisconsin, facility that produces more than 550 tons of glass per day, float glass expert Al Slavich shows Kevin how residential window glass is manufactured using state-of-the-art technology. With the rough plumbing complete and inspected, it's time to infill the slab. To cut costs, Tom shows Kevin how to make concrete from scratch - 3 parts gravel, 2 parts sand, 1 part cement - mixing it on site with a portable concrete mixer.