gambrick.com › does-a-brick-home-need-insulationDoes A Brick Home Need Insulation? | Brick Siding - Modern Design New red brick home with black front door and black shutters. New Brick Homes. Brick siding became the norm when building codes began requiring insulation inside the exterior walls. One of the best insulators is actually air. Most good insulation traps air which is why it’s so light and fluffy, the exact opposite of brick.