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Flashcard · Footings and Foundations

Sizing a footing: what is the order of lookups?

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Sizing a footing: what is the order of lookups?: Soil value first, then the building (stories and construction type), then the R403.1 footing table, then depth and frost protection.IRC 2024 R401.4, R403.1, R403.1.4
No soil test on site. What soil value can the inspector use?: The presumptive load-bearing value for the soil class in Table R401.4.1. The AHJ can require a test where soil is doubtful, such as fill, expansive clay or organic soil.IRC 2024 R401.4, Table R401.4.1
Where does the local frost depth come from?: Table R301.2, where the jurisdiction fills it in. It is not one national number.IRC 2024 Table R301.2; R403.1.4.1
Name two ways to give a footing frost protection other than going below the frost line.: A frost-protected shallow foundation (R403.3), or bearing on solid rock. R403.1.4.1 lists the options.IRC 2024 R403.1.4.1, R403.3
Why do the footing tables give a brick veneer or solid masonry house a bigger footing than light frame?: Heavier walls put more load on the soil, so the minimum width and thickness go up.IRC 2024 R403.1
A footing on a sloping lot: when must it be stepped, and what do you check?: When its bottom would slope more than R403.1.5 allows. Each step then bears on level ground. Check the trench bottom, not the top of the form.IRC 2024 R403.1.5
A footing sits near the edge of a slope. Which section?: R403.1.7, because the soil in front of the footing could give way.IRC 2024 R403.1.7
Expansive soils, wood foundations, precast concrete foundations: where?: Expansive soils R403.1.8. Wood foundations R401.1, R403.2 and R404.2. Precast concrete R403.4 and R404.5.IRC 2024 R403.1.8, R403.2, R403.4, R404.2, R404.5
A column bears on a footing. What is the inspector's main check?: Restraint at the base so the column cannot slide off, plus the beam connection at the top. A wood column on concrete also brings in decay protection (R304).IRC 2024 R407; R304
A concrete foundation wall table needs which three facts from the field?: Wall height, height of unbalanced backfill, and soil class.IRC 2024 R404.1
Sill plate anchor bolts: what are the checks?: Bolt size, embedment and spacing; a bolt near each end of every plate piece; washers and nuts on before framing covers them. Straps, where used, go in to their instructions.IRC 2024 R403.1.6
Before checking foundation anchorage, what should you look up in Table R301.2?: The seismic design category. Higher categories add anchorage rules.IRC 2024 Table R301.2; R403.1.6