Live And Dead Roof Loads In Nc Residential Design

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.

Live and dead roof loads in nc residential design.

The might of the dead load or lack thereof often defines how much live load it can handle. The values for dead loads in table 3 2 are for commonly used materials and constructions in light frame residential buildings. Structural steel offers much less of a dead load and provides superior support for live loads in multi story buildings. The scope therefore is limited to single family attached and detached buildings.

That a designer may find useful and necessary. 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. Loads used in design load equations are given letters by type. This criteria for roofing design is a compilation of data policies legal aspects preferences experiences prejudices etc.

Ground snow load commonly 10 psf usually roof live load governs unless snow drifts are considered frost heave. It is intended to advance residential building design by unifying the current practice of applying design loads. Method of determining design loads for typical residential construction in the united states. Reinforced concrete creates the heaviest dead loads but also supports the most weight with its tremendous compressive strength.

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. Wind uplift pressures c. Structural design solutions p c. Dead load live load cold weather load.

3 3 dead loads dead loads consist of the permanent construction material loads comprising the roof floor wall and foundation systems including claddings finishes and fixed equipment. With tar and gravel. D dead load l live load l. Roofing criteria state of north carolina pat mccrory governor department of administration kathryn johnston acting secretary.