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.
Triple joist timber floor definition.
This allows you to install a supporting post off the double floor joist to hold a second storey or a.
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.
With all joined timbers supported by fully nailed proprietary joist hangers.
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 and triple joist hangers are wider to accommodate either a thicker piece of lumber or two or three joists placed side by side.
In these cases the joist hangers will be 4.
Why would you use a double floor joist.
Framed or triple joists timber floors.
The main reason for doubling up floor joists is to double the strength of a single floor joist.
Single joist timber floors.
But larger is not always better when builders are constructing a home or adding a room addition.
Double floor joists are two joists side by side that are usually nailed or screwed together along the length.
Common sense tells you that large floor joists can carry more load and spacing joists closer together also increases the load bearing capacity of a floor.