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-   -   Help with sistering/blocking floor joists (

travelover 02-27-2009 06:18 AM

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Good point inspectorD. Think of an I beam. In bending, all the stress is on the top and bottom web. The top is in compression, the bottom is in tension, there is no stress in the middle. Wood is weaker in compression than tension, so it is important to reinforce both the top and bottom.

You can beef up the floor by simply sistering a board to the top of the joist and a second one to the bottom, with the pipe and wires in the middle. The pipes and wires should be in the middle of the current joist because that way the beam is not weakened.

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