Roof Live And Dead Loads

The roof shall be designed for the live load indicated in table r301 6 or the snow load indicated.

Roof live and dead loads.

Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states. 1the load combinations and factors are intended to apply to nominal design loads defined as follows. L design floor live load. H design lateral pressure for soil condition type.

Live loads keep on changing from time to time. From the general concept of load comes two major categories. As a result the live load dead load and distribution of forces are different. Victor staley a building official in the town of brewster mass responds.

The floors walls roof columns stairs permanent equipment and any fixed decor constitute a static load that normally doesn t change over the life of the building. Live loads are also called as imposed loads. Loads used in design load equations are given letters by type. Where d is floor dead load.

How do they differ. D estimated mean dead weight of the construction. L r l o r 1 r 2. In short the dead load of a structure comprises its completed weight usually measured in pounds per square foot before it goes into service.

Where l r shall not be less than 12 psf and not more than 20 psf. Roof live load may be reduced by the following equation. Thick 125 12 in. This issue of live load vs.

Lr maximum roof live load anticipated. Thick 100 10 in. Roof live load reduction. Live roof load w wind load s snow load e earthquake load r rainwater load or ice water load t effect of material temperature h hydraulic loads from soil f hydraulic loads from fluids.

Dead loads and live loads. Live loads on floors and roofs consists of all the loads which are temporarily placed on the structure for example loads of people furniture machines etc. D dead load l live load l. Thick 150 concrete block wall 8 in.