I don t think doubling up a 16 2x8 will all of a sudden span 30.
Doubling up every other floor joist.
To achieve this doubling effect in strength and stiffness you will indeed need to gusset the upper and lower joists together.
How to make floor joists stronger.
Does this seem correct please.
What are they and why use them.
If we use strong enough gussets and fasteners we know that the top and bottom joists will deflect by exactly the same amount when loaded.
What are double floor joists.
After several centuries of service floor joists in older homes may sag or crack.
I would think the doubled up s would span further because you can attach one to the other more thoroughly.
Long spans of joists in newer homes may wobble or bounce from foot traffic.
Double floor joists are two joists side by side that are usually nailed or screwed together along the length.
Each joist is strong enough to support my weight 175lbs concentrated in a 1 segment of the joist and.
Not even a 12 micro will span that far.
I d like to double my ceiling joists to make my attic space easier to work in for electrical plumbing and for lightweight storage.
I need to put two large velux roof lights 1200 x 1500 in line with each other which means removing two joists and trimming around them.
This allows you to install continue reading double floor joists.
2x4 s actual size spaced 16 on center running the width of the building uninterrupted with the ends resting on top of the wall top plate.
Why would you use a double floor joist.