What is insulbrick?

Insulbrick is indeed a fiberboard asphalt siding product. It was designed to resemble brick and was used primarily in the mid-20th century as an economical exterior cladding option for homes and buildings. The manufacturing process involves treating wood fiber with asphalt, resulting in a durable yet lightweight material that mimics the appearance of traditional brick siding.

This product gained popularity for its affordability and ease of installation; however, it may pose some challenges today, such as durability concerns and potential issues with moisture retention. Understanding Insulbrick is essential for home inspectors, particularly when evaluating older properties where this material may be present, as it can impact both aesthetic and structural assessments.