The amount of weight a 2×8 can support is going to depend on the span of the joist, and how far apart it is from the next joist. Regular garage ceiling joists of modern construction can generally support 50lb/sqft. Understanding the structural limitations of floor systems is just one of the ways ADS Engineering can help is assessing existing buildings. People, who want to know how much weight can a 4×4 beam support, be it on the backyard swing set or the deck with a hot tub in it, worry not because we have got the answers for you. A medium safe is usually between 700 pounds to just below a thousand pounds. Remember to spread the load ACROSS your joists and not along them. Drill a 5/32 inch pilot hole before placing each lag to prevent splitting the joist. for 2-grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load, which is typical of normal residential construction: Garage door is 16' x 7'. I put down a very thick plywood floor and use the attic for storage. Higher grades of lumber (clear, select, or 1) have fewer flaws, and will, therefore, be stronger. Get daily tips and tricks for making your best home. The strength of a given joist board is most dramatically affected by the board's top-to-bottom width. You'd also have to have the attachments to the top plate of the walls adequate to support the weight of the floor. The larger the deck, the larger the joists. How much weight can the ceiling joists in my garage hold? First, is it a ceiling joist with an attic above? How much weight can a ceiling joist hold? 1,000 poundsspan can carry 10 psf while a 2×8 will carry 20 psf. Will the current joists support the weight? lineman standing on one leg will fall through the floor. The actual dimensions for the safe spans between 30â (W) × 42â (H) but can go up to 40â (W) × 50â (H). If i give you the floor joist size and the thickness of the plywood and over all demensions of the platform. In the example, the joists have a spacing of 16 inches and a span of 11 feet, 2 inches. The rec room is the only room on the 2nd floor and contains attic access and a ⦠This is also true of trees within the same speciesâwhen conditions cause slow growth, the lumber from the tree will be stronger. Just so, how much weight can 2×6 floor joists hold ? For example, a properly designed office floor can support 50 pounds per square foot. As a rule of thumb, the main factors are the quality and type of wood, the project design, the duration of the load on the 2×4-inches wooden frame, and the actual weight of the load. 50lb/sqftRegular garage ceiling joists of modern construction can generally support 50lb/sqft. I have an 800 pound “free motion” weight machine. I purchased an office safe weighing 202 lbs. So instead of ceiling joists in my garage, Iâve actually got the floor joist for the second floor serving as my garage ceiling. This may seem light, but this is 50 pounds over each and every square foot of floor space. He has professional registrations in D.C., Maryland, Ohio, Pennsylvania, South Carolina, Virginia and West Virginia. Use a screw long enough to penetrate 2 inches into the joist material, probably 4 inches. If I double the 2nd joist, will that help? Builders generally use pre-calculated tables to tell them appropriate joist spans for each lumber species, size, and spacing. How much weight can a 11 7/8″ X 1 3/4″ X 20′ wooden I-Joist hold. Floor loads are described using two measurements: dead load and live load. Location and configuration of heavy loads should be looked at on a case by case basis. To give you a little background, I have a two-story home with my master bedroom directly above the garage.