Floor Joist Blocking Spacing
Blocking is required in several different scenarios.
Floor joist blocking spacing. 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. Trusses structural composite lumber structural glue laminated members and i joists are exempted from this requirement but must be supported according to the manufacturers recommendations. But larger is not always better when builders are constructing a home or adding a room addition. A joist wont deflect in six feet.
Quotejoists iexceedingi nominal 2 inches by 12 inches 51 mm by 305 mm shall be supported laterally by solid blocking diagonal bridging wood or metal or a continuous 1 inch by 3 inch 254 mm by 76 mm strip nailed across the bottom of the joists perpendicular to joists at intervals not exceeding 8 feet 2438 mm quoteunless you are framing a floor system with sawn lumber joists that are greater in depth than 2x12s no blocking is required. The right spacing depends on the code requirements as well as the type of structure it is and the weight it. Bridging two feet from the wall will not make the floor stronger. There are three basic measurements used for floor joist spacing.
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. It can make a floor stiffer by forcing one loaded joist to share burden with its adjacent neighbors but will not increase the total load bearing capability of a floor system. None of us had any experience and he had no frkin idea what he was doing. Using 2x lumber for floor joists i install blocking or bridging every 8.
Blocking when correctly done isnt too expensive when youre also laying down floor joists but if you have to install blocking after the fact it is much more costly and time consuming. Properly spacing floor joists when framing an addition or whole structure is largely a factor of building codes. Chapter 4 floor construction 71 the primary design consideration in choosing the minimum size and the maximum span and spacing of floor joists trusses beams girders and headers is adequate support for dead and live. Floor joists can also be attached to a full depth header rim joist or to an adjacent stud.
Thats code around here. Ceiling joists ive never installed solid blocking or bridging before i always install strongback every 8 using a 2x4 flat and a 2x6 on edge.
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