If you have any questions.
Double joist timber floor.
Why would you use a double floor joist.
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.
Driving 16d common nails in old hard wood is difficult.
Single joist timber beam.
Then attach the sister joist using three 16d common nails driven every 16 in.
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.
Dead load weight of structure and fixed loads 10 lbs ft 2.
Double joists timber floors.
1 psf lb f ft 2 47 88 n m 2.
This allows you to install a supporting post off the double floor joist to hold a second storey or a.
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.
Live load is weight of furniture wind snow and more.
1 ft 0 3048 m.
Basement ground floor of timber 1 auditorium dances and dramas.
2 grade of douglas fir are indicated below.
Double and triple joist hangers.
Wall plates sleeper wall 10 to.
This chart is for basic reference only.
Maximum floor joist span for no.
True floor joist span calculations can only be made by a structural engineer or contractor.
T imber flooring basement or ground floor of timber.
Live load represents the weight of furniture snow etc.
With all joined timbers supported by fully nailed proprietary 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.
Framed triple joist timber floor.
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.
Dead load is the weight of the structure and any fixed items.
Double floor joists are two joists side by side that are usually nailed or screwed together along the length.
Filling of selected earth wall bridging joists floor boards f l d p c.
But it s usually best to run the sister joist over the entire span.
Single joist timber floors.
How joists support floors and ceilings joists the horizontal members that span two walls and or beams have to carry the weight of the walls people furniture appliances and other stuff we place on them.
In these cases the joist hangers will be 4.
Double and triple joist hangers are wider to accommodate either a thicker piece of lumber or two or three joists placed side by side.
