Questions and Answers

Common engineering questions answered by our professional engineers.

A: Increased snow loading primarily affects purlins, trusses and rafters. However, it also affects post size, footing size and truss attachment.

A: The purpose of a footing is to resist vertical movement of the posts due to vertical loading. The footing prevents the post from sinking into the ground over time.

A: The most common footing size for a pole building in the northwest is 24″ diameter and 6″ thick. Footings can be larger or smaller as required by load conditions.

A: Footing size is effected by vertical loading and soil capacity.

A: Large doors or openings will increase loading in the diaphragm. The walls may require plywood sheathing. When openings are designed into a building, its capacity to resist lateral (primary wind) loading is reduced.