Connecticut Building Design Criteria for Homes

Most states leave the climatic and geographic design criteria for local officials to complete. Connecticut fills in nearly all of it centrally. The amended Table R301.2 sets the seismic design category at B, weathering at Severe, termite risk at Moderate-Heavy, the winter design temperature at 7°F, the air freezing index at 1,500 or less, the mean annual temperature at 50°F, and the climate zone at 5A, all statewide. Ice barrier underlayment is required. Flood hazards are the one item explicitly left local: the table reads simply that they are to be determined locally. A footnote adds that the Severe weathering classification may require a higher strength concrete or grade of masonry than the structural requirements alone would call for, which is a practical consequence worth catching at specification rather than at inspection.

These criteria are enforced through plan review and inspection rather than as offences in themselves. Specifying concrete or masonry that meets only the structural requirement, and not the Severe weathering classification, is the common failure: the footnote exists precisely because that substitution looks compliant on a structural calculation and is not.