The design of my first floor extension called for 3 150x50mm joist bolted together for the trimmer joist. However when the joist timber was delivered it was a nominal 47x150mm, when measured it was just 45x150mm. My problem is that all the wood-to-wood joist hangers that I have found are ether too big 150wide or too small 125wide. I have tried to find another timber suppler of 50x150mm c16 without luck.
Don't understand your reference to "too big 150wide" or "too small 125 wide" but if you must have 50x150 find a timber merchant with a saw mill and get them to cut 75x150 to the size you want.
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