piers in single brick walls

Appreciate any advice/pointers on this because my Structural Engineer has sent calculations for a door and aperture that don't add up I think (and hasn't responded for 2 days). We want to install sliding patio doors in the garden-facing back room which has an external width of 3430mm (location...

Bricklayer by trade however not being in the trade for years and I mean years, and things have changed to how we used to do it. I have dusted off my tools to build myself a garage. Its single skin 73mm bricks and need to put some piers in. Size approximately 5.2m X 3.2m. How many piers should I...