Roof Live And Dead Loads

Thick 150 concrete block wall 8 in.

Roof live and dead loads.

L r l o r 1 r 2. The roof shall be designed for the live load indicated in table r301 6 or the snow load indicated. Where l r shall not be less than 12 psf and not more than 20 psf. 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.

Thick 125 12 in. Victor staley a building official in the town of brewster mass responds. 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. This issue of live load vs.

From the general concept of load comes two major categories. Dead loads and live loads. Thick 100 10 in. Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states.

D dead load l live load l. As a result the live load dead load and distribution of forces are different. Live loads are also called as imposed loads. In short the dead load of a structure comprises its completed weight usually measured in pounds per square foot before it goes into service.

Lr maximum roof live load anticipated. D estimated mean dead weight of the construction. 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. 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.

1the load combinations and factors are intended to apply to nominal design loads defined as follows. H design lateral pressure for soil condition type. 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. L design floor live load.

Roof live load may be reduced by the following equation. Live loads keep on changing from time to time. How do they differ. Where d is floor dead load.