Double and triple joist hangers.
Triple joist timber floor definition.
The main reason for doubling up floor joists is to double the strength of a single floor joist.
This allows you to install a supporting post off the double floor joist to hold a second storey or a.
Why would you use a double floor joist.
With all joined timbers supported by fully nailed proprietary joist hangers.
Double floor joists are two joists side by side that are usually nailed or screwed together along the length.
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.
Double and triple joist hangers are wider to accommodate either a thicker piece of lumber or two or three joists placed side by side.
Single joist timber floors.
In these cases the joist hangers will be 4.
Framed or triple joists timber floors.
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.
But larger is not always better when builders are constructing a home or adding a room addition.
The extra two inches of vertical distance when a floor is framed with 2 x 10 joists rather than 2 x 12s can be quite important for example.