This is the simplest type of timber floor used for residential buildings where spans are short or moderate say up to 4 m and loads are comparatively lighter.
Double joist timber floor.
Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in.
Double floor joists are two joists side by side that are usually nailed or screwed together along the length.
Additional support for the floor joists is achieved by nailing the ends of the joists into headers.
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.
With all joined timbers supported by fully nailed proprietary joist hangers.
T imber flooring basement or ground floor of timber.
Double and triple joist hangers are wider to accommodate either a thicker piece of lumber or two or three joists placed side by side.
Live load is weight of furniture wind snow and more.
True floor joist span calculations can only be made by a structural engineer or contractor.
Double joists timber floors.
Tack a beam under the sagging joists.
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.
The main reason for doubling up floor joists is to double the strength of a single floor joist.
Double joist timber beam.
Framed or triple joists timber floors.
Section r502 10 of the international residential code states that header joists can be the same size as the floor joists when the header joist span isn t greater than 4 feet but if the header joist span is more than 4 feet you ll need to double the header joist and ensure that it s capable of.
Why would you use a double floor joist.
Dead load weight of structure and fixed loads 10 lbs ft 2.
In these cases the joist hangers will be 4.
1 ft 0 3048 m.
Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall.
Single joist timber beam.
Then set new joists same height as existing ones alongside the old.
2 grade of douglas fir are indicated below.
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.
1 psf lb f ft 2 47 88 n m 2.
When a load is applied to a joist the wood fibers along the bottom edge go into tension and those along the top go into compression fig.
Double and triple joist hangers.
Single joist timber floors.
Filling of selected earth wall bridging joists floor boards f l d p c.
Framed triple joist timber floor.
Basement ground floor of timber 1 auditorium dances and dramas.
A day until they re level.
Wall plates sleeper wall 10 to.
