I have a standard 2 car garage. It is 22 feet by 22 feet. It has 2X6 joists running one way so that they are about 3.5 feet apart (hope this makes sense). I am wanting to fininsh the area with a floor so I can have storage space. I wa going to use 2x4 between them every 16 inches.
My big question is: do I need to do anything like sistering the joices or do I need some kind of support in the middle of the structure connected to the roof so that the whole thing doesn't fall in on top of the cars because of the weight.
Also, How do I calculate the amout of weight that this will hold. I do not want to overload it and again make it fall in and destroy cars and house.
I hope someone can help. I am stuck and don't know what to do now.
wow! 3 and half feet between joists? even with 2X6 that seems really wide...
are you thinking to put the 2X4s perpendicular to the 2X6 joists then put plywood floor above that?... that's probably what I would do...
as for weight, don't know how you'd calculate it but I'm sure it would hold plenty to be able to store typical things people store in attic space... sports equipment, Xmas stuff, small pieces of furniture etc.
Thank you for responding. The way you described it is what I was thinking too. But in talking to others I think I will sister the joists with 2x6's. Then use the 2x4 perpendicular. I was also told that for added support I should use 2x4's to make a V from the roof to the joists on every oner one then lay down the ply floor. When this was told to me it sounds like it will support everything I could think of storing. Thanks again for the reply.