Roof Live And Dead Loads

Roof dead load framing sheathing asphalt shingles insulation drywall 10 exterior wall 2 4 framing sheathing siding insulation drywall 10 floor joist sheathing carpeting drywall 10 concrete wall 8 in.

Roof live and dead loads.

Dead loads and live loads. Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states. D estimated mean dead weight of the construction. Roof live load may be reduced by the following equation.

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. Live loads keep on changing from time to time. Thick 150 concrete block wall 8 in. On a roof with a slope greater than 4 to 12 the live load limit is typically adjusted downward from 20 psf to 15 psf to allow for the relatively greater dead load on the steeper roof.

Thick 100 10 in. In short the dead load of a structure comprises its completed weight usually measured in pounds per square foot before it goes into service. 1the load combinations and factors are intended to apply to nominal design loads defined as follows. Thick 125 12 in.

D dead load l live load l. Victor staley a building official in the town of brewster mass responds. L design floor live load. 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.

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. Where d is floor dead load. H design lateral pressure for soil condition type. 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.

Lr maximum roof live load anticipated. L r l o r 1 r 2. Where l r shall not be less than 12 psf and not more than 20 psf. Roof live load reduction.

From the general concept of load comes two major categories. How do they differ. As a result the live load dead load and distribution of forces are different. This issue of live load vs.