Live Load Roof Deck

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The load that is placed on your deck is expressed in pounds per square foot psf and the total load or more appropriately the design load is comprised of the dead load and the live load.

Live load roof deck.

This is the common practice in my area where the base snow load is 60 psf and goes up from there. Where snow isn t a problem the live load can come from people working on the roof and any equipment they take on to the. Yes a deck is a special purpose roof with a live load equal to the floor load. That means they won t work for areas with heavier snow loads for decks with heavy decking materials like stone or in numerous other circumstances.

The live load on a roof is the weight of any temporary objects on the roof. This is usually about 10 psf. The live load is the external force applied to a deck due to the activities of its use. Live loads for assembly spaces other than those described in this table shall be determined from the occupant load requirements as established by section 1004 of this code using the formula 1 000 net floor area per occupant but shall not be less than 50 psf nor more than 100 psf.

People furniture and any other movable physical objects on the deck are covered under live load. Some code officials engineers and contractors have added the two loads together when designing decks and others have just done as you suggest basing the calculations on the larger of the two loads either snow load or live load. If a balcony over 100 sf can be designed for residential live 40 psf and a balcony 100 sf is designed for 60 psf it follows the roof deck should be the same i e. A smaller area is liable to have a higher live load than the regular residential floor live 40 psf.

The tank calculation sheets showed the load combinations for supporting lugs are 1 long term is dead load of roof live load 122kg m2 25psf 2 short term is dead load of roof rain fall 250mmaq. One shortcoming of the span tables in the international residential code and the american wood council s prescriptive residential wood deck construction guide dca 6 is that they re limited to decks with a live load of 40 psf and a dead load of 10 psf. I have never seen calculations that use both s and l added together for design of roofs or decks. Dead load is basically the load created by the weight of the deck itself.

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