Live And Dead Roof Loads In Nc Residential Design

Wind uplift pressures c.

Live and dead roof loads in nc residential design.

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. Loads used in design load equations are given letters by type. 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. Structural design solutions p c.

Residential design loads construction presentation by. That a designer may find useful and necessary. 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.

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. Roofing criteria state of north carolina pat mccrory governor department of administration kathryn johnston acting secretary. Dead load live load cold weather load. 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. 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. The might of the dead load or lack thereof often defines how much live load it can handle. The scope therefore is limited to single family attached and detached buildings.

It is intended to advance residential building design by unifying the current practice of applying design loads. Structural steel offers much less of a dead load and provides superior support for live loads in multi story buildings. Method of determining design loads for typical residential construction in the united states. D dead load l live load l.