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I think what your saying is should you just screw in pvc to the Inverted T or should you put a 2x4 across the T. If thats what your asking yes, screw pvc into a 2x4, andthen screw the inverted T'sto the wood with pvc on it. Make sure the T's are long enough to not wobble, wobbley rails suck.. If your talking about welding i have no idea.