Minimum Roof Live Load

Lower roof load than specified in the following equa tions shall not be used unless approved by the building official.

Minimum roof live load.

Such structures shall be designed for a mini mum roof live load of 12 psf 0 58 kn m2. 0 9d 1 0e effect or 0 9 when resisting the load when permanent. Applicable provisions of the asce 7 standard minimum design loads for buildings and other structures asce 1999. Axial forces from snow loads and roof live loads should usually not be considered simultaneously with an extreme wind load because they are mutually exclusive on residential sloped roofs.

Minimum design loads for buildings and other structures location uniform load psf. Minimum roof live loads nscp roof slope 1. My question is can this load be reduced to 0 lb ft 2 at the owner s request and the tank still be considered an api 650 tank. The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span.

Rise 1 vertical per 3 horizontal to less than 1 horizontal. Arch or dome with rise 3 8 of span or greater. 0 58 l r 0 96 the reduction factors ri and r2 shall be determined as follows. 12 lr 20 for where.

Minimum roof live load is 30psf. 1 2d 1 0e l 0 2s when h loads are present they shall have 6. Roofs used for promenade purposes shall be designed for a minimum live load of 60 psf 2 87 kn m 2. Rise 1 vertical to 1 horizontal.

Per api 650 5 2 1f the minimum roof live load on the horizontal projected area of the roof is to be 20lb ft 2 or may be determined by asce 7 but shall not be less than 15lb ft 2. The roof must be able to support the sum of its dead load and any anticipated live load so the roof has to be designed with a load limit that takes into account both of these loads. County amendment d section 1603 1 snow loads. 3 ground snow load pg minimum ground snow load shall be 30 psf county amendment minimum flat roof snow load pf if applicable.

0 9d 1 0w a load factor of 1 6 when adding to load 7. Minimum roof pitch for shingles it is important for shingle roofs to function properly and one method of ensuring that this is achieved is to observe the pitch requirements for the shingles. Flat or rise less than 1 vertical to 3 horizontal. Minimum uniformly distributed live loads adapted from sei asce 7 10.

Roofs used for roof gardens or assembly purposes shall be designed for a minimum live load of 100 psf 4 79 kn m 2.