Live Load For Roofs In Kentucky

Underlayment for asphalt shingles clay and concrete tile metal roof shingles mineral surfaced roll roofing slate and slate type shingles wood shingles wood shakes and metal roof panels shall conform to the applicable standards listed in this chapter.

Live load for roofs in kentucky. Why snow load information. Flat roof snow loads p f the snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load. Roof live loads largest roof loads typically caused by repair and maintenance pitch rise span lr 20 r1r2 12 lr 20 lr horizontal projection roof live load 16 r 1 r 2 live load reduction factors r 1 accounts for size of tributary area of roof column a t r 2 effect of the roof rise. Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states.

Roofs are under a lot of pressure. Where uniform roof live loads are reduced to less than 20 psf 0 96 kn m 2 in accordance with section 1607 13 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 see section 1607 13 2 for reductions in minimum roof. Ordinary flat pitched and curved roofs and awnings and canopies other than of fabric construction supported by lightweight rigid skeleton structures are permitted to be designed for a reduced roof live load as specified in the following equations or other controlling combinations of loads in section 1605 whichever produces the greater load in structures such as greenhouses where special. In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing.

Victor staley a building official in the town of brewster mass responds. In our case let s assume that our structure has a flat roof roof slope 5. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. This issue of live load vs.

2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes. A great deal of confusion currently exists among engineers architects recreation specialists and maintenance personnel concerning the proper snow loading to use for the design and maintenance of trail bridges building roofs and other structures in mountainous high snow load areas. Underlayment materials required to comply with astm d226 d1970 d4869 and d6757 shall bear a label indicating compliance to the standard. The roof shall be designed for the live load indicated in table r301 6 or the snow load indicated.