Sill Plates and Anchors
The sill plate should be levelled carefully. If the top of the foundation is level, the sill plate may be laid directly on caulking placed on the top of the concrete or over a closed-cell foam gasket or other air-impermeable material of the same width as the sill plate. If the top of the foundation is uneven or not level, the sill plate may be laid in a full bed of mortar. All sill plates must be anchored to the foundation wall with anchor bolts at least 12.7 mm (½ in.) in diameter spaced not more than 2.4 m (8 ft.) on centre or other approved anchors. Buildings with two or more floors located in areas where the exposure category to earthquake or wind is high are required to have stronger anchorage.
Source : Canada Mortgage and Housing Corporation (CMHC)