Snow Loads For Church Roofs

Calculate unbalanced snow load for hip and gable roofs as shown in asce figure 7 5 below.

Snow loads for church roofs.

You need to use a snow load formula for flat roofs. First figure out how deep the snow is piled up there. Edwin nagy at the university of maine department of civil and environmental engineering. Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10.

Boca also allows you to reduce the snow load for roofs with slopes greater than 30 degrees presumably because snow will slide or blow off steeply pitched roofs. The truss could be designed based on the assumption that the 25 psf roof snow load is a factored ground snow load in which case a ground snow load is back calculated using asce 7 based on the specified roof snow load pg 25 psf therein lies the problem with specifying only a roof snow load. Snow load is the downward force on a building s roof caused by the weight of accumulated snow and ice. 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.

7 2b with a c s 1 0 p f flat roof snow load in psf. The determination of the drift load that is. 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. Residential roof with asphalt wood shingles or shakes would use fig.

However in my practice i typically use the. Initially we will discuss the framing of gable roofs so that we can learn the basics of how to size a roof rafter beam or joist. Snow load is the downward force on a building s roof by the weight of accumulated snow and ice. Why snow load information.

7 4 1 7 4 4 and asce figure 7 2 below. In our case let s assume that our structure has a flat roof roof slope 5. Or if the building was poorly designed or constructed. If your roof is flat it is more likely to have snow load problems than if it is pitched.

Technically you should use the actual rafter length when adding up the weight of roofing materials. All roof framing tables are organized by maximum snow load. In most regions the first thing to consider before sizing the wood framing members for a roof is the maximum snow load that the roof will have to bear. Modern buildings are designed with snow load in mind said dr.

P s sloped roof snow load in psf c s roof slope factor as determined by asce sec. How snow load can damage your buildings. For dead loads you are correct.