straighten

Sloped Roof Snow Load Cases

NBC 2025
v1.0.0
File:
Project:
Designer:
Date:

Climatic Data

Source
Region
Location
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Ground snow load
Ss:
Rain Load
Sr:
Winter Average
Temperature, Tws:
°C
Wind speed, Vws:
m/s
Importance factor
Is:
Factors
Cb:

If Cb left blank, provide the dimensions in the roof geometry to compute Cb

Wind Factor, Cw:
info
If Cw left blank, Cw will be computed.
Thermal Factor, CT:
Average indoor temperature, Tin:
°C
Roof Thermal Transmittance, Uroof:
W/(m2K)
info
Provide Ct or Tin and Uroof.
Roof Geometry
Pitch:
/12
Slippery:
Roof Plan dimensions
Dimensions used to calculated Cb if Cb left empty.
Longer dimension, l:
m
Shorter dimension, w:
m
snow load cases

Specified Snow Load

S = Is[Ss(CbCwCsCa)+Sr] [4.1.6.2]

Factors

User input values:
Ss = 1 / Sr = 1
Importance Factor, ULS: Is = 1.0 / SLS: Is = 0.9
Roof slope = 0 degrees
Slope Factor
For non-slippery roof:
Slope <= 30 degrees.
Cs = 1

ULS:

S = 1.0[1(0.8*1.0*1*1.0)+1] = 1.8kPa

S = 1.8 kPa

S = 37.6 psf


SLS:

S = 0.9[1(0.8*1.0*1*1.0)+1] = 1.62kPa

S = 1.62 kPa

S = 33.8 psf

This information must be read or used in conjunction with Part 4 of the NBC 2025. In the event of discrepancies, Part 4 of the NBC 2025 shall govern.

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