Victor staley a building official in the town of brewster mass responds.
Nc deck roof snow and dead loads.
This issue of live load vs.
Used but they typically defined the load cases or combination stress or strength limits and deflection limits.
The purpose of this web site is to provide ground snow load analysis information and data gathered from all 50 states.
D dead load l live load l r live roof load w wind load s snow load e earthquake load r rainwater load or ice water load.
Wind uplift pressures c.
The north zone middle zone and the south zone are identified on the roof load zone.
In regions with heavy snowfall the snow load may exceed the 40 psf live load.
Purpose of this web site.
In those instances allowable spans for larger live loads can substitute for an equivalent snow load.
The dead load on a roof is the weight of the roof structure itself along with any permanently attached materials or structures on the roof so it must be designed first of all to.
The deck supports the non load bearing components such as insulation membrane flashing etc.
The minimum design roof snow load.
The roof shall be designed for the live load indicated in table r301 6 or the snow load indicated.
For residential decks designed for entertaining large groups it s not a bad idea to overbuild it from the minimum 40 psf required by building codes.
Roofing criteria state of north carolina pat mccrory governor department of administration kathryn johnston acting secretary.
This is usually about 10 psf.
Ground snow load might seem somewhat confusing until you read the basic premise that is identified in irc section r301 6 which states.
The reactions resulting from the dead load and live load specified in table 1607 1 or the snow load specified in section 1608 in accordance with section 1605 acting on the cantilevered portion of the deck and no live load or snow load on the remaining portion of the deck.
Roof load live load design is affected by the shape of the roof whether it is flat curved or pitched.
Schilke civil agricultural engineering montana state university august 1989.
Load types loads used in design load equations are given letters by type.
In areas of the state outside of certified local government jurisdictions the design snow load shall be based on the ground snow loads developed in snow loads for structural design in montana authored by f f.
Each state has a listing of building code and applicable guidelines for snow loads as well as details about where the snow load information may be found or purchased.
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.
