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Roof Live Load is the load to which roof is subjected in addition to its own weight. Check FAQs
Lf=20⋅R1⋅R2
Lf - Roof Live Load?R1 - Reduction Factor for Size of Tributary Area?R2 - Reduction Factor for Slope of Roof?

Roof Live Load Example

With values
With units
Only example

Here is how the Roof Live Load equation looks like with Values.

Here is how the Roof Live Load equation looks like with Units.

Here is how the Roof Live Load equation looks like.

18.18Edit=20⋅1.01Edit⋅0.9Edit
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HomeIcon Home » Category Engineering » Category Civil » Category Structural Engineering » fx Roof Live Load

Roof Live Load Solution

Follow our step by step solution on how to calculate Roof Live Load?

FIRST Step Consider the formula
Lf=20⋅R1⋅R2
Next Step Substitute values of Variables
∴ Lf=20⋅1.01⋅0.9
Next Step Prepare to Evaluate
∴ Lf=20⋅1.01⋅0.9
LAST Step Evaluate
∴Lf=18.18N

Roof Live Load Formula Elements

Variables
Roof Live Load
Roof Live Load is the load to which roof is subjected in addition to its own weight.
Symbol: Lf
Measurement: ForceUnit: N
Note: Value should be greater than 0.
Formulas to find Roof Live LoadOpen Variable
Reduction Factor for Size of Tributary Area
Reduction Factor for Size of Tributary Area is the factor by which the size of tributary area reduces.
Symbol: R1
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Formulas to find Reduction Factor for Size of Tributary AreaOpen Variable
Reduction Factor for Slope of Roof
The Reduction Factor for Slope of Roof is the factor by which the slope of the roof reduces.
Symbol: R2
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Formulas to find Reduction Factor for Slope of RoofOpen Variable

Other Formulas to find Roof Live Load

​Go Roof Live Load when Tributary Area Les in Range 200 to 600 square feet
Lf=20⋅(1.2-0.001⋅At)⋅R2

Other formulas in Roof Live Loads category

​Go Tributary Area given Roof Live Load
At=1000⋅(1.2-(Lf20⋅R2))

How to Evaluate Roof Live Load?

Roof Live Load evaluator uses Roof Live Load = 20*Reduction Factor for Size of Tributary Area*Reduction Factor for Slope of Roof to evaluate the Roof Live Load, The Roof Live Load is defined as the live load for a roof which is equivalent to 20 times the product of reduction factors for tributary area and slope of roof. Roof Live Load is denoted by Lf symbol.

How to evaluate Roof Live Load using this online evaluator? To use this online evaluator for Roof Live Load, enter Reduction Factor for Size of Tributary Area (R1) & Reduction Factor for Slope of Roof (R2) and hit the calculate button.

FAQs on Roof Live Load

What is the formula to find Roof Live Load?
The formula of Roof Live Load is expressed as Roof Live Load = 20*Reduction Factor for Size of Tributary Area*Reduction Factor for Slope of Roof. Here is an example- 18.18 = 20*1.01*0.9.
How to calculate Roof Live Load?
With Reduction Factor for Size of Tributary Area (R1) & Reduction Factor for Slope of Roof (R2) we can find Roof Live Load using the formula - Roof Live Load = 20*Reduction Factor for Size of Tributary Area*Reduction Factor for Slope of Roof.
What are the other ways to Calculate Roof Live Load?
Here are the different ways to Calculate Roof Live Load-
  • Roof Live Load=20*(1.2-0.001*Tributary Area)*Reduction Factor for Slope of RoofOpenImg
Can the Roof Live Load be negative?
No, the Roof Live Load, measured in Force cannot be negative.
Which unit is used to measure Roof Live Load?
Roof Live Load is usually measured using the Newton[N] for Force. Exanewton[N], Meganewton[N], Kilonewton[N] are the few other units in which Roof Live Load can be measured.
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