From looking at my book, brick has a resistance value of 0.43 and wood has a resistance value of 5.0. So wood should be a much better insulator. However homes are usually built with brick. Good homes have a double layer but air only has a resistance value of 1.0 Brick homes are considered better and more common. Why build homes with brick if they are poor insulators? Is it because they are stronger than wood and lasts longer. This factor is more important than insulation when considering materials for homes? Or would it be because wood homes only have a thin layer whereas bricks are thicker. So this would make bricks a bit better insulators espeically if doubled layer brick homes.