Snow Load

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Snow Load API

Calculate balanced and unbalanced snow loads per ASCE 7-16 and ASCE 7-22 Chapter 7. Returns flat roof snow load, sloped roof snow load, design snow load, and applicable factors.

Standards

Standard	Endpoint	Key Difference
ASCE 7-16	POST /v1/snow-load/asce7-16/calculate	Thermal conditions as numeric codes (1-6)
ASCE 7-22	POST /v1/snow-load/asce7-22/calculate	Descriptive thermal conditions, roof R-value input

Two Approaches

Single-Call (Recommended)

Create, configure, and solve in one request using the standard-specific endpoints above. API Reference →

Multi-Step

For iterative design scenarios:

Code
 
POST  /v1/snow-load/asce7-{16,22}/sheets    → Create
PATCH /v1/snow-load/sheets/{sheetId}         → Update
POST  /v1/snow-load/sheets/{sheetId}/solve   → Solve
GET   /v1/snow-load/sheets/{sheetId}         → Get results

Quick Example

Calculate snow load for a building with a 4:12 roof slope (ASCE 7-16):

Code
 
curl -X POST https://api.calcs.com/v1/snow-load/asce7-16/calculate \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "projectId": "your-project-id",
    "name": "Warehouse Roof",
    "attributes": {
      "exposure": "Partially Exposed",
      "thermalCondition": "1",
      "eaveToRidgeDistance": 30,
      "roofSlope": 4
    }
  }'

Response:

Code
 
{
  "sheetId": "sheet_abc123",
  "name": "Warehouse Roof",
  "standard": "ASCE 7-16",
  "status": "solved",
  "results": {
    "passed": true,
    "outputs": {
      "pF": 24.99,
      "pS": 24.99,
      "pDesign": 24.99,
      "cE": 1.0,
      "cS": 1.0,
      "cT": 1.0,
      "iS": 1.0
    }
  }
}

Output Fields

Field	Description	Unit
pF	Flat roof snow load	psf
pS	Sloped roof snow load	psf
pDesign	Design roof snow load	psf
cE	Exposure factor (Ce)	-
cS	Slope factor (Cs)	-
cT	Thermal factor (Ct)	-
iS	Importance factor (Is) (ASCE 7-16 only)	-

Project Defaults

By default, the calculator uses project defaults for risk category, ground snow load, and surface roughness. To override these, set overrideDefaults: true in your attributes and provide the values directly.

Next Steps

• API Reference - Full interactive endpoint documentation with all input parameters