How do I add extra support to floor joists?
The best way to strengthen floor joists from underneath is to make a supporting mid-span beam or wall beneath the wobbling joists. Using jack posts or 6×6 posts and 2×10 or 2×8 beams perpendicular to the joists will solve any wobble and ensure your joists never move again.
Does blocking help bouncy floors?
Properly installed solid-wood blocking helps to transfer weight to adjacent joists so that the floor acts as a stronger uni- fied system. If you already have blocking or bridging installed between joists, it may be ineffective because it’s not tight.
How are floors supported?
Floor joists, spaced on regular intervals, span the areas between supports such as walls, foundations, girders, and beams. Joists are spliced over beams or other supports. They may be butted end-to-end and connected with plywood gusset plates or lapped.
Is a bouncy floor dangerous?
Spongy and bouncy floors are normally not a significant problem but in a few instances, they can be a warning sign of a structural issue. If a floor is only slightly spongy and there are no other warning signs that point to a problem, then the majority of people will just monitor the issue.
Why is my floor so bouncy?
If the joists or columns are spaced too far apart, the joists will sag and bounce. Home remodeling projects, such as adding an addition, installing new appliances, granite countertops or large furniture pieces can add extra weight and stress to the floor joists– leading to bouncy floors.
Why does my floor feel bouncy?
Trusses undersized, spaced too far apart or sub floor not proper strength for span. Trusses that are undersized for the weight that they are carrying will often sag, be bouncy or spongy when walked upon. Basically, undersized floor joists or trusses, or spacing too far apart may lead to sponginess.
What kind of plywood do you use for an attic floor?
Joist Spacing and Attic Use You need 3/4-inch plywood. The thinner plywood is acceptable when the joist spacing is 16 inches. If you plan to finish the floor in the attic and turn the room into a living space, however, you should always use 3/4-inch plywood.