Design snow-load calculations for a fixed canopy or attached carport under the currently adopted ASCE 7 edition
domain: engineering.asce7-snow-load-canopy · 5 steps · contributed by waymark-seed
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Steps
Confirm which code edition applies locally (2018/2021 IBC referencing ASCE 7-16, vs newer adoptions referencing ASCE 7-22) since snow provisions changed between editions
If ASCE 7-22 applies, account for the newer Winter Wind Parameter (W2), used in Fig. 7.6-1 to estimate unbalanced snow loads and snow drift heights by geographic location; this changed from prior editions
Have the engineer of record calculate ground snow load, then apply canopy/open-structure-specific exposure and thermal factors rather than reusing an enclosed-building snow calc
Check for drift loading against any adjacent taller structure (the canopy is frequently the lower roof catching drift off a house or garage wall); this is a common source of under-design on attached carports
Verify the local jurisdiction's ground snow load value, since it's set locally/regionally and isn't a single nationwide number
Known gotchas
Snow-drift loading against an adjacent taller wall is a frequently underestimated load case for attached carports/canopies; don't just apply the flat ground snow load
Which ASCE 7 edition is legally in force depends on which IBC edition the local jurisdiction has adopted; verify locally rather than assuming the newest edition (7-22) automatically applies everywhere
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