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I want to make a instruction for vertical ladder installation (Securing a ladder to a wall firmly with screws or something) Information I want to put in the sentence is:

  1. Secure one spot (less than 0.5m from the floor) of the ladder to the wall

  2. the rest of the part: every 1m

I don't know how to put these into a sentence...

  • "Secure at least 0.5m from the floor and every 1m of the ladder to the fixture."
  • "Secure one spot within 0.5m from the floor and every 1m of the ladder."

please help me. thank you.

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    The bottom fixing must be at least 0.5m above the floor, and it must be secured every 1m above that. I'd have thought it's implicit that you expect the lowest fixing to be no more than 1m above ground level, but perhaps you might think you should explicitly say that too.
    – FumbleFingers
    Jul 14 at 11:01
  • Actually, your question text alternates between "at least" and "less than". I didn't think about the real-world implications before, but presumably you mean The bottom fixing must be no more than 0.5m above the floor, and it must be secured every 1m above that.
    – FumbleFingers
    Jul 14 at 11:46
  • At least can be ambiguous: and depends on understanding what is being done and why. Normally it gives a minimum count or distance ("retreat at least 10 metres after lighting the firework"), but it can give an upper bound ("feed at least every 3 days").
    – Stuart F
    Jul 14 at 11:48
  • Thank you for answering. I understood that I shouldn't have used "at least" and I think "no more than 0.5 above the floor" is what I wanted to say.
    – Jiro F.
    Jul 14 at 12:01
  • Note that if it's an outside ladder, we'd say ...above [the] ground, not ...floor. The article is optional with "ground", but required with "floor".
    – FumbleFingers
    Jul 14 at 12:24

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