Point Load On Roof

There are two main forces acting on the board in a roof assembly.

Point load on roof. Point loads such as foot traffic and rolling loads. The weight of a worker walking across a steel building roof is a live load. The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot. In traditional sloped roof framing loads are transmitted vertically downward through the roof framing to the exterior walls that transmit the load downward to the home s.

There are of course other activities on a roof that could contribute to facer delamination such as dropping or dragging objects across the roof assembly. Introduction the point load test plt is an accepted rock mechanics testing procedure used for the calculation of a rock strength index. Realize the new economics of solar. Any objects moved in and out the structure are live loads including people designated as occupancy plants furniture and so forth.

It is important to list live load dead load and total load separately because live load is used to compute stiffness and total load is used to calculate strength. 15 psf x 14ft 210 pounds per lineal foot. One building owner realized a 225 cash roi in just 18 months and secured a long term lease that meets the strict sustainability requirements demanded by fortune 1000 companies. The focus of this paper is to present the data analysis used to correlate the point load test index is50 with.

The load increases with the use of heavier roofing material. The influence of hurricanes or earthquakes can shift the designed loading of a structure. The coal mine roof rating cmrr. For example in a garage cars trucks boats and rvs constitute live loads.

Another simple beam calc for dimensional lumber with drop down species list simple beam point load at midspan simple beam point load at any location two point loads at one third points on a simple beam. This index can be used to estimate other rock strength parameters. A good example of a point load that is not anticipated is the sliding of a roof load of snow off the pitched roof onto a flat roof. 50 psf x 14ft 700 pounds per lineal foot.

This situation would cause a point load created by the pile of snow and if heavy enough could cause failure in the structure. Primary roof members exposed to a work floor single panel point of lower chord of roof trusses or any point along primary structural members supporting roofs over manufacturing storage warehouses and repair garages all other occupancies all roof surfaces subject to maintenanceworkers 0 96h 2 87 4 79 i.