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  1. JT122

    Steel box section above bifold

    Hi, I'm hoping to get some advice. I am enlarging a window to 1840mm to accommodate a bifold door on the ground floor of a 4 storey Victorian two skin property. Is a 100mm x 100mm x 5mm mild steel box section be strong enough as an internal lintel spring the floor joists. I can't fit a larger u...

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