Rhode Island Building Design Criteria for Homes

Rhode Island replaced the model code's Table R301.2 with its own, and filled in the criteria that the model code leaves blank. Weathering is classified Severe and decay Slight to Moderate. Termite risk is Moderate to Heavy. Ice shield underlayment is required. The air freezing index is recorded as 1,200 degree days below freezing and the mean annual temperature as 50°F. The one criterion that splits geographically is the winter design temperature: 0°F in Providence County and 5°F everywhere else, a small difference, but one that feeds directly into heating system sizing. Flood hazards are handled by reference to the community flood insurance rate maps rather than a value in the table, so that item still requires a local lookup even though the rest of the criteria are settled statewide.

These are design inputs enforced at plan review and inspection rather than offences in their own right. The winter design temperature split is the one that most often goes wrong in practice, because a heating calculation prepared for the wrong side of the Providence County line uses a design temperature five degrees off and undersizes or oversizes accordingly.