Requirements for Professional Involvement Pile & grade beam foundations must be designed by a professional Engineer for pile size, depth, spacing and reinforcement in the piles. Steel screw piles or wood pile foundations require an Engineers design. Preserved wood foundations must be stamped by a professional Engineer or conform to CAN/CSA-S406-92. Post & beam construction with framing members spaced greater than 24” o.c. requires an Engineers design. Slabs-on grade or thickened slabs require an Engineers design for reinforcement in the slab when garages exceed 55m2 (600 ft2). Shallow foundations or footings that are less than 1.2m (4 ft.) below grade level require an Engineer’s design. Tall walls that require wind bracing may require an Engineers design (generally greater than 14 ft. high). NOTE: A building that falls in the scope of Part 3 of the Building Code or is greater than 600 m2 (6460 ft2) will require an Engineers or Architects stamp.