Live And Dead Roof Loads In Nc Residential Design

Ground snow load commonly 10 psf usually roof live load governs unless snow drifts are considered frost heave.

Live and dead roof loads in nc residential design.

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. 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. With conventional clay tile roofing.

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. Structural steel offers much less of a dead load and provides superior support for live loads in multi story buildings. Loads used in design load equations are given letters by type. Reinforced concrete creates the heaviest dead loads but also supports the most weight with its tremendous compressive strength.

The might of the dead load or lack thereof often defines how much live load it can handle. Residential design loads construction presentation by. That a designer may find useful and necessary. Structural design solutions p c.

This criteria for roofing design is a compilation of data policies legal aspects preferences experiences prejudices etc. 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. Wind uplift pressures c. With tar and gravel.

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