How do you calculate roof dead load?

How are dead and live loads calculated?

Live and dead loads are given in the building code.

Ridge Beam Example.

1st floor live load: 40 psf x 12 ft = 480 pounds per lineal foot
2nd floor live load: 30 psf x 12 ft =360 pounds per lineal foot
2nd floor dead load: 10 psf x 12 ft =120 pounds per lineal foot
total load: =1160 pounds per lineal foot

What is standard roof load?

Roof loads are a downward (vertical) force on the home. … The North Zone design live load equates to 40 pounds per square foot, the Middle Zone equates to 30 pounds per square foot, and the South Zone equates to 20 pounds per square foot.

What are examples of dead loads?

Dead loads are structural loads of a constant magnitude over time. They include the self-weight of structural members, such as walls, plasters, ceilings, floors, beams, columns, and roofs. Dead loads also include the loads of fixtures that are permanently attached to the structure.

What is the difference between live and dead loads?

The dead loads are permanent loads which result from the weight of the structure itself or from other permanent attachments, for example, drywall, roof sheathing and weight of the truss. Live loads are temporary loads; they are applied to the structure on and off over the life of the structure.

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How much weight can my roof support?

Standard Roof Weight

Typically, the dead load for shingled roofs is roughly 20 pounds per square foot. Roofs that are made of sturdy material like concrete, metal or clay tile can support dead loads at 27 pounds per square foot.

What type of load is snow on a roof?

SO HOW MUCH SNOW CAN A ROOF HOLD? Alberta’s building codes specify that your roof can bear loads of at least 22lbs per square inch. To see that kind of load, your roof would need to hold a snow drift 4.5 feet high, or 2.5 feet of compressed snow. That’s a lot of snow!

What is maximum roof load?

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.

What is a roof dead load?

Dead loads pertain to the weight of the roofing structure along with the permanent components of the residential property. Dead loads also include the weight of the construction materials. … The dead load of asphalt shingle roofs with wooden frames is usually 15 pounds per square foot (psf).

Is gravity a dead load?

A dead load is a gravity load. … Live loads may move within the structure exerting different loads in different parts of the structure at different times. They are not permanent. A live load may be furniture and people in a building.

Is furniture a dead or live load?

Dead loads are the very first vertical load that always needs to be considered. … All these loads are part of what an occupant brings into the building. These items are normally furniture and movable partitions. The live loads will continuously change inside a building, as people bring things in and out of the space.

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What are the types of load?

The types of loads acting on structures for buildings and other structures can be broadly classified as vertical loads, horizontal loads and longitudinal loads.

Types of loads acting on a structure are:

  • Dead loads.
  • Imposed loads.
  • Wind loads.
  • Snow loads.
  • Earthquake loads.
  • Special loads.


How are live loads determined?

Live loads, L, are a result of the occupancy of a structure. In other words, it varies with how the building is to be used. For example, a storage room is much more likely to larger loads than is a residential bedroom. Bleachers at a stadium are likely to see larger loads than what is seen on a pitched building roof.

Is wind a live load or dead load?

Live loads are those loads produced by the use and occupancy of a building or structure and do not include construction loads, environmental loads (such as wind loads, snow loads, rain loads, earthquake loads and flood loads) or dead loads (see the definition of “Live Load” in IBC 202).

Roofs and roofing