Live And Dead Roof Loads In Nc Residential Design

Method of determining design loads for typical residential construction in the united states.

Live and dead roof loads in nc residential design.

Reinforced concrete creates the heaviest dead loads but also supports the most weight with its tremendous compressive strength. This criteria for roofing design is a compilation of data policies legal aspects preferences experiences prejudices etc. The values for dead loads in table 3 2 are for commonly used materials and constructions in light frame residential buildings. Where uniform roof live loads are reduced to less than 20 psf 0 96 kn m 2 in accordance with section 1607 11 2 1 and are applied to the design of structural members arranged so as to create continuity the reduced roof live load shall be applied to adjacent spans or to alternate spans whichever produces the most unfavorable load effect.

D dead load l live load l. Ground snow load commonly 10 psf usually roof live load governs unless snow drifts are considered frost heave. The might of the dead load or lack thereof often defines how much live load it can handle. Wind uplift pressures c.

Dead load live load cold weather load. The scope therefore is limited to single family attached and detached buildings. Structural steel offers much less of a dead load and provides superior support for live loads in multi story buildings. Roofing criteria state of north carolina pat mccrory governor department of administration kathryn johnston acting secretary.

Structural design solutions p c. With tar and gravel. Light frame wood roof with wood structural panel sheathing and 1 2 inch gypsum board ceiling 2 psf with asphalt shingle roofing 3 psf 15 psf. 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.

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. With conventional clay tile roofing. It is intended to advance residential building design by unifying the current practice of applying design loads. Loads used in design load equations are given letters by type.