Deck footing depth and framing loads in St. Joseph County, IN
county/South Bend joint dept (incl. Granger)
The numbers a St. Joseph County, IN deck permit turns on, and the one question worth asking before you draw it. Same figures the free deck span calculator sizes from.
- Frost depth
- 36″
- Framing load
- 50 psf
- Code in force
- 2020 Indiana Residential Code (2018 IRC + Indiana amendments)
- Stairs and guards
- Riser ≤ 8¼", tread ≥ 9"
675 IAC 14-4.4-5, replacement IRC Table R301.2(1) — per-county frost depth — St. Joseph row: 36 in
40 psf live plus 10 psf dead, the basis the span tables are built on. No separate ground snow load is recorded for here, so the tables govern — if your department publishes a ground snow above 40 psf, the tables stop covering the deck and that is worth a call.
Guard required over 30″ above grade, 36″ minimum height. 675 IAC 14-4.4-16 and -17, amending IRC R311.7.5.1 / R311.7.5.2
Who to ask
- Granger and the unincorporated county are served by the joint St. Joseph County / City of South Bend Building Department. Mishawaka, New Carlisle and Walkerton issue their own permits.
- A widely repeated 42 in frost depth for this county has no primary source — the state table says 36 in.
The question, word for word
Read this one down the phone. It is answerable in a sentence, which is why it gets answered.
“The state table puts this county at 36 inches for footing depth. Is that what you inspect to, or do you require deeper? And do you want a soils report for a deck, or will you take the presumptive bearing value out of the code table?”
Size a deck in St. Joseph County, IN
The free calculator carries all of the above. Pick St. Joseph County, IN in the jurisdiction box and it sizes joists, beams, posts and footings at 50 psf, digs to 36″, and tells you where a number runs past the end of a table instead of printing one anyway.
Open the deck span calculatorNone of this is an engineered design, and none of it replaces your plans examiner. It is the published code, the published tables, and a note where the two do not meet.