Roof Dead Load Calculation Example

50 psf x 14ft 700 pounds per lineal foot.

Roof dead load calculation example.

For dead loads you are correct. Typical unit area dead load calculations. 6the 0 6 reduction factor on d is intended to apply to the calculation of net overturning stresses and forces. Where d is floor dead load.

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. Load types loads used in design load equations are given letters by type. However in my practice i typically use the horizontal run of the roof for both types of load. L r l o r 1 r 2.

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. A table of roof material weights including sheathing insulation and other decking materials. 15 psf x 14ft 210 pounds per lineal foot. D dead load l live load l r live roof load w wind load s snow load e earthquake load r rainwater load or ice water load.

3 3 dead loads dead loads consist of the permanent construction material loads. Technically you should use the actual rafter length when adding up the weight of roofing materials. 910 pounds per lineal foot. To do this i use conservative too heavy dead loads and full snow loads regardless of pitch.

Used but they typically defined the load cases or combination stress or strength limits and deflection limits. 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. Roof live load reduction. Weight psf 20 ga metal deck 2 5 waterproof membrane with gravel 5 5.

Where l r shall not be less than 12 psf and not more than 20 psf.