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 Post subject: making a ships ladder
PostPosted: 13 Jan 2018, 15:03 
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Gentles all, I have been asked by a mate to make something like this as access to a loft workshop over a garage. The garage is separate from his house, so this won't be for a dwelling, though the finished article will need to look good.
I plan to make a jig and rout housings for the treads. Then glue and fix through the stringers (?) with some sort of decorative headed bolts.

I have a couple of questions:

1. Is there guidance anywhere as to what size timbers I should use and recommended distances between treads, depth of tread housings etc?
2. Are there building regs that I will need to conform to?
3. Is there anywhere that might sell the sort of ironwork used as a hand rail per the photo below?



Any help grateully received.

Thanks


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PostPosted: 13 Jan 2018, 15:37 
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I would keep the rise at approx 175-200mm

Machine the strings out of 38mm (1 1/2") and with a good fixing and tight housings 12-15mm should be deep enough

The thickness of the treads will be subjective to the width of the steps however if you use a thin section (1" or less) then you can always stiffen the tread with a mini riser fixed under the tread

The picture you have used, in my opinion is over engineered for its purpose however possibly acceptable aesthetically

I cannot see that it will require building regs if in a garage and non habitable

Instead of ironmongery for the handrail, why not just route out slots in the top of the strings then radius for comfort, like so

Attachment:
ships ladder.jpg


if you want a larger going but still keep the pitch then alternating treads might be suitable

Attachment:
alternating treads.JPG


food for thought


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PostPosted: 13 Jan 2018, 16:14 
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Sorry I can't resist, but feel compelled to mention the ingenious folding ladder Thomas Jefferson designed
apparently, built by Roy
https://www.youtube.com/watch?v=s6MTgWIUGFk

Just thought it might pose a solution for a small vessel


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PostPosted: 13 Jan 2018, 19:32 
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I made one for my son to access a loft bedroom. 25mm treads in a 8mm rebate in the stringers but with 2 through mortices wedged at each end of the treads. I used ash and contrasting wedges of something mahogany like that was to hand at the time.
It has been in daily use for the last 20 years and no signs of loosening or racking.


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PostPosted: 17 Jan 2018, 16:38 
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Fellas, thanks for replies, most helpful. Appreciate yer taking the time to respond/

I love the Jefferson Ladder - I like the way the chap whacks it and behold a ladder appears - beyond my skills to make one like that though.


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PostPosted: 17 Jan 2018, 17:09 
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If you're after an alternate step ladder, I got mine off ebay and cut it to the correct height. The instructions were a little vague but trial and error won out!

Phil

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PostPosted: 17 Jan 2018, 18:26 
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My boat companionway ladder treads are (grooved tread) 39cm x 11cm x 22mm thick, 24cm rise. Stringers 12cm x 22mm however, it's only 152mm long so may need to be beefed up.


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