Roof Dead Load Calculation Example

50 psf x 14ft 700 pounds per lineal foot.

Roof dead load calculation example.

Load types loads used in design load equations are given letters by type. It is important to list live load dead load and total load separately because live load is used to compute stiffness and total load is used to calculate strength. Weight psf 20 ga metal deck 2 5 waterproof membrane with gravel 5 5. 3 3 dead loads dead loads consist of the permanent construction material loads.

910 pounds per lineal foot. However in my practice i typically use the horizontal run of the roof for both types of load. Technically you should use the actual rafter length when adding up the weight of roofing materials. Used but they typically defined the load cases or combination stress or strength limits and deflection limits.

A table of roof material weights including sheathing insulation and other decking materials. 11 04 2014 computing the unit dead load for a region of surface area generally starts by identifying the region of a roof plan floor plan or elevation where the unit load is needed then looking at a typical section of that area to see how it is constructed. L r l o r 1 r 2. Typical unit area dead load calculations.

For wind the analysis of overturning should also consider roof uplift forces unless a separate load path is designed to transfer those forces. For dead loads you are correct. To do this i use conservative too heavy dead loads and full snow loads regardless of pitch. Where d is floor dead load.

15 psf x 14ft 210 pounds per lineal foot. R 1 1 for a t less than or equal to 200 psf r 1 1 2 0 001 a t for between 200 psf and 600 psf. Example roof truss analysis 3 6 stability determinacy assume that truss is externally statically determinate for gravity loads num forces 33 3 36 num eqns 18 x 2 36 therefore stable determinate dead load roof ceiling wt. Roof live load may be reduced by the following equation.

Roof live load reduction.