The loads are based on adjusted roof snow loads from the governing building code.
Psf load shed roof.
Here each square foot of roof system delivers 50 pounds of live load and 15 pounds of dead load 65 psf total to the structural support system.
On the other hand snow that stayed on your roof for a few days will settle and while it seems that the cover gets thinner its weight doesn t change it s just the density that is different.
For example fresh snow is soft fluffy and light.
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.
The dead load on a floor is determined by the materials used in the floor s construction.
Normal standard for floors depends deck floor attic floor primary living area sleeping room lots of choices.
If there s wall board covered ceiling suspended from the underside of that floor the dead load increases to about 10 pounds per square foot.
When building a structure it is important to calculate wind load to ensure that the structure can withstand high winds especially if the building is located in an area known for inclement weather.
Psf live per sq ft live load live load is movable stuff people furnature etc.
However if the attic is intended for storage the attic live load or some portion should also be considered for the design of.
In order for a structure to be sound and secure the foundation roof and walls must be strong and wind resistant.
2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes.
For the curious 7 16 osb has a span rating of 24 16 and with supports every 24 inches is good for a roof live load of 40 psf pounds per square foot with a 10 psf dead load.
The density of snow and hence its load per square foot depends on the type of snow.
Reeds ferry shed floors are designed to carry a live load of 40 50 psf.
Standard floors use 3 4 exterior grade plywood with double layer and pressure treated plywood optional.
A typical wood frame floor covered with carpet or vinyl flooring has a dead load of about 8 pounds per square foot.
For roof live loads of 12 psf or 16 psf.
All loads are listed as pounds per square foot of horizontal projection footprint area.
The thickness required by josh s circumstances are good for roof snow loads of up to 70 psf again spanning 24.
See figure 1 headers.
For roof live loads less than 20 pounds per square foot psf rafter spans and required e values tabulated for 20 psf shall be permitted to be adjusted in accordance with the fol lowing table.
