How To Decide Roof Dead 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 support itself.

How to decide roof dead load. Live load on attic floor local requirements. Floors roofs and walls most floor roof and wall systems have fairly uniform density and their weights can be expressed in terms of weight per unit area. 15 psf x 14ft 210 pounds per lineal foot. Technically you should use the actual rafter length when adding up the weight of roofing materials.

Joist span bridging girder load width half joist span live load on roof local requirements for wind and snow. Ft dead load of roof of wood shingle construction 10 lbs. There are several convenient ways to express the intensity of dead loads. 50 psf x 14ft 700 pounds per lineal foot.

The common symbol for density is. Here weight means the downward force the structure exerts on the earth. To do this i use conservative too heavy dead loads and full snow loads regardless of pitch. 3 3 dead loads dead loads consist of the permanent construction material loads comprising the roof floor wall and foundation systems including claddings finishes and fixed equipment.

However in my practice i typically use the horizontal run of the roof for both types of load. Dead load is the weight of all the permanent parts of a structure. Determining dead load from material weights material density is a measure of how much mass in a unit volume causes a force due to gravity. Dead load is the term structural and mechanical engineers use to describe the weight of all the permanent parts of any structure.

For dead loads you are correct. 910 pounds per lineal foot.