Having been in business nearly 35 years, we pride ourselves in building a solid, quality home that withstands the test of time. We continually search for ways to use better materials, and will only use products we would put into our own homes. Take a look at the 20th Century Advantage.



20th Century uses JM FORMALDEHYDE-FREE™ FIBER GLASS INSULATION. JM Spider custom insulation is a spray-in fiberglass isulation. It fills framing cavities completely, leaving no gaps or voids, which results in superior thermal performance and sound control. The system uses fiber glass with 25 percent recycled content and is protected against mold growth with an EPA-registered mold and mildew inhibitor. And because it’s formaldehyde free, it improves indoor air quality, making it a better and safer choice for you and your family.

Effective R Values

2 x4 Exterior Walls – R 15
2x6 Exterior Walls – R 23
House Attic – R 40
Sloped Ceilings R 38