Formula For Determining Deck Load With A Roof Over

Multiply the load per square foot by the total area of the roof.

Formula for determining deck load with a roof over.

Deck beams and joists go hand in hand as the framing materials for your deck. If you drove a dump truck over it yes this would throw all our calculations out the window. This is the amount of weight that must be supported by the pier. This is highly regional as weights of snow for example range from 10 to 300 pounds per square foot based on moisture and volume of the snow.

Don t get confused with what weight you might think or want to load the deck with. If you re brand new to deck installation follow the steps below to ensure you buy the correct quantity of all materials. While joists provide a horizontal support system for deck boards beams provide support for the joists. The total load for each tributary area is then divided by the area of each footing in order to determine the load psf imposed on the soil.

For dead loads you are correct. If an example roof is 10 feet by 20 feet the total area is 200 square feet. Remember these loads are distributed uniformly over the entire surface of the roof. Default is 50 psf which you can change.

This calculator determines the size of each tributary area of your deck. It then determines the total load from each tributary area based on the design load of your deck. This number represents the total load that your roof must carry. Determine the transient load of the roof.

This is all of the natural stresses imposed upon a roof such as snow loads rain loads and wind loads. To determine the load of a deck pier you must take half the length of the joist span multiplied he length of the beam span measured from pier to pier. However in my practice i typically use the horizontal run of the roof for both types of load. The distance in this case is 12 ft 2 ft 14 ft.

So a 100 sqft deck would be designed to support 5000 lbs. To determine the maximum load capacity of your deck start by calculating its total area and multiply by 50 psf. Technically you should use the actual rafter length when adding up the weight of roofing materials. Multiplied by 40 pounds per square foot equals 8 000 pounds.

Total number of boards dsa sbc x 1 1 calculate how much deck material you need for your new deck. Your beams will need to bear the load of not only your decking materials but additional components of the frame itself. This number is then multiplied by 50 which is the 40 psf live load 10 psf dead load mentioned earlier.