Triple Joist Timber Floor Section

2 grade of douglas fir are indicated below.

Triple joist timber floor section.

Basement ground floor of timber 1 auditorium dances and dramas. You can notch and bore joists without sacrificing critical strength but you must follow the rules. This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c 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. Dead load weight of structure and fixed loads 10 lbs ft 2.

Let s expand our house beyond that 17 2 span capability to 24 feet wide. The floor consists of wooden joists also called bridging joists spaced 30 to 40 cm apart and supported on end walls. Ce 200 details of construction. Double and triple joist hangers.

True floor joist span calculations can only be made by a structural engineer or contractor. Around floor openings such as stairs it will be necessary to install larger or double triple timber trimmers bolted together to carry the floor joists see guide leaflet 6 for information. 1 ft 0 3048 m. Most floor joists consist of 2 by 6 inch lumber but they can use 2 by 8 or 2 by 10 as well which will require longer joist hangers.

Single joist timber floors. Follow the rules to keep your floor solid. With all joined timbers supported by fully nailed proprietary joist hangers. Live load is weight of furniture wind snow and more.

If your home is more than 20 years old your floor joists are most likely solid wood 2x8s 2x10s or 2x12s. So the house dimensions will now be 24 x 13. Section on ab joist wedges floor boards 300 400 mm herring bone strutting 9. In these cases the joist hangers will be 4.

1 psf lb f ft 2 47 88 n m 2. The notching and boring rules of thumb for solid lumber are shown in fig. Maximum floor joist span for no. The widest span in the floor joist span table in part 2 of this tutorial module showed that floor joists can span 17 2 if they are 2 x 12s spaced 12 o c.

Double and triple joist hangers are wider to accommodate either a thicker piece of lumber or two or three joists placed side by side. Framed or triple joists timber floors.