Hello, Im moving my garage forward onto the side of my house and building above it as well. Due to the drive being narrow at the front I am going to build a single leaf wall for the garage. The wall above the garage will be cavity wall. I know this can be done by buidling pillars into the single wall below and then spanning them with lintels, but, what is the minimum width of a pillar for this type of job? And, would one pillar in the middle of the garage wall be enough? The single wall will be 6.3m long.
Any advice would be appreciated,