Decks with cantilevered framing members, connections to exterior walls or other framing members shall be designed and constructed to resist uplift resulting from the full live load acting on the cantilevered portion of the deck. IRC R31S.1.2 Field treatment.
To determine the maximum load capacity of your deck, start by calculating its total area and multiply by 50 psf. So a 100 sqft deck would be designed to support 5000 lbs. Don't get confused with what weight you might think or want to load the deck with. If you drove a dump truck over it, yes this would throw all our calculations out the window.
Determine the maximum load the deck is expected to be subjected to. This requires knowledge of the location of the hot tub, any additional loads to be placed, and assignment of live load on the remainder of the deck.
Each member, that is a part of that deck has a load capacity. The load capacities are mainly determined by the area of the section modulus. For example, a 6x6 post has an area of 5 1/2"x 5 1/2" which equals 30 1/4" sq.in. Based on the species of wood and the 30 1/4 sq.in., the load capacity can be found for a 6x6.
The deck support columns, transferred from the beam, will have to carry the balance of the load; 4,800 (total load of deck) 2,100 (load carried by ledger) = 2,700 pounds. We also determined that the maximum load we want to carry on any one deck support column is 1,250 pounds. The calculation of 2,700 ÷ 1,250 comes out at 2.2.
Deck Load Design & Calculations - Part 1 Part 2. ... This article will guide you through the process of calculating the deck load and the positioning of the deck support columns for your new deck. ... as it is unlikely that any clay soil would have less than 1,250 psf capacity, or you can contract with a soil engineer to obtain the exact psf ...
For a residential deck, the code requires it be designed to support a minimum 40-psf live load. The live load is the external force applied to a deck due to the activities of its use. People, furniture, and any other movable, physical object on the deck are covered under live load.
Given that most decks are less than 12 feet tall or so, 6x6 posts can support the loads from nearly any typical deck framed with standard dimensional lumber, as the maximum spans of the joists and beams limit the area and the load any single post must support.
Deck Load Calculator - Figure out size and quantity of . This value must not be greater than the bearing capacity of the soil. . Live load accounts for people and things on a deck.
The load-bearing capacity of the soil (assume 3,000 pounds for Hoffman Estates). Deck Load Calculator - Deck Design This value must not be greater than the bearing capacity of the soil.
The species of lumber, size of lumber and the load it carries. Fewer posts on upper level decks are typically more desirable to the occupants and this drives the use of larger framing materials for longer spans. Beam span maximums are based on a maximum anticipated live load. Building codes for residential decks only require 40 psf.
It then determines the total load from each tributary area based on the design load of your deck. Default is 50 psf which you can change. 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. This value must not be greater than the bearing capacity of the soil. If it is, you must increase the size of the footing to spread the weight out over a greater surface area or increase the number of footings.
And since the deck is symmetrical, the load areas 5 and 6 on the opposite side of the deck are identical. This leaves only the load areas 3 and 4 in the center area of the deck to be determined. Inner Supported Load Areas. The supported load areas in the center of the deck (areas 3 and 4) are already set out for us.
Dead Load consists of the weight of the deck structure that sits on top of the posts. An average deck would be designed to handle a load of 50 psf (pounds/square foot) and is made up of 10 psf for the dead load and 40 psf for the live load. This is a minimum.
Deck Load Design & Calculations - Part 2. Part 1. If we had determined that our soil can only have a maximum load of 750 psf we would have needed 2,700 ÷ 750 = 4 deck support columns equally spaced.
Determining Deck Load Capacity. Determining Deck Load Capacity (post #) TomLafferty on Fri, 07/14/2000 - 03:55 . in . The Archives * We are considering installing a hot tub on our deck. What is the best way to determine the load that our deck can support? Reply; Print this page;
How many PSF does my deck need to support? For a residential deck, the code requires it be designed to support a minimum 40-psf live load. The live load is the external force applied to a deck due to the activities of its use.