[Ravensfort] showers / Re: [rfofficers] Gundy's Find

[byzytym]

Aluminum IS metal.

It is really cool that so much information is coming across.  Thanks so much 
for everyone's input.  I am guessing that this will be a hot topic at 
Officers Meeting.  If you can, please plan on attending with your ideas and 
drawn plans.  All the info will assure that we make a good choice.

I have some ideas for selves, hooks and a second shower curtain for dry 
personal effects and privet dressing.

In service,
Vlod NotVlad


----- Original Message ----- 
From: "Catie Clark" <cat at rocks4brains.com>
To: "Ravens Fort" <ravensfort at lists.ansteorra.org>
Sent: Monday, October 13, 2008 4:34 PM
Subject: Re: [Ravensfort] showers / Re: [rfofficers] Gundy's Find


> If the issue is weight, here are some numbers to be considered.  Looking 
> at these, I think 10 lbs a shower wall is maybe a bit optimistic (unless 
> we found just the right plastic)
>
> plywood (b/c, outdoor grade)
> 1/4" 4x8 sheet 25# (0.7812 #/ft^2)
> 1/2" 4x8 sheet 50# (1.5625 #/ft^2)
> 3/4" 4x8 sheet 75# (2.344 #/ft^2)
>
> To get to marine plywood weights, multiply those numbers above by 1.25.
>
> Steel sheet, mild cold rolled
>
> 32 guage/0.0097"  0.4057 #/ft^2
> 28 guage/0.0156"  0.6534 #/ft^2
> 26 guage/0.0179"  0.7486 #/ft^2
> 22 guage/0.0299"  1.25 #/ft^2 (Ambrose: 1.6#/sqtf)
> 18 guage/0.0478"  2.0 #/ft^2 (Ambrose: 2.6#/sqft)
> I went back and looked at Ambrose App C where his sheet steel weights 
> reside and his weights are for painted, not bare, steel sheet.  The other 
> weights are all based on guage thickness multiplied by American standard 
> guage weight of 41.82#/inch thickness steel plate (mild cold rolled)
>
> Corrugated "tin" roofing:
>
> varies depending on age and manufacture
> between 0.7 and 1.25 #/ft^2
> (including framework and fasteners)
> [citations on request...]
>
> a lot of the old "tin" roofing, the stuff from the 19th and early 20th 
> century was actually very thin sheet steet or sheet iron which was plated 
> with tin, tin and lead alloy or zinc, as a rust proofing.
>
> Plastics
>
> I think we could all profit from a little more research into the 
> structural plastic stuffs. I'm not at all familiar with
> what ever FRP is, for example.  The stuff used up at Yellowstone is twice 
> the weight of wood to achieve the same structural behavior - but it is 
> able to survive Yellowstone winters, the acidic environment of the 
> geothermal areas and intense UV exposure at 8000 elev.  But heavy and 
> expensive.
>
> The problem with plastics is that there are so many of them and all with 
> widely varying properties.  It is no longer true that all plastics die in 
> sunlight or break down chemically in terms of a few years - but the high 
> grade stuff is never cheap.
>
> And yes, Sainted David, tin roofing works because of the support structure 
> that supports it.  I have nothing against very thin guage metal of any 
> composition if it has adequate support.  But I was responding to 
> specifically to what I interpreted as a suggestion for unsupported, 
> uncorrugated 32 gauge mild sheet steel, which can be mangled in your hands 
> (if that's an exaggeration, then it's a very slight one; I've worked with 
> the stuff as sheathing on boats - it's insubstancial - we used it just 
> because it was flimsy enough to be easily workable).  But add support 
> structure & corrugation and thinness of guage becomes a minor issue. Both 
> corrugation and support change the story - but support networks add 
> weight, and I was assuming weight was an issue here.  Lathing is not 
> weight free - you have to account for its weight too, in addition to the 
> sheet metal.
>
> Is there a reason no one has considered corrugated aluminum?
>
> I think one could get away with 26 guage of any metal unsupported ( or 
> with one or two brace pieces only) but if I were building this thing for 
> me, I'd want to run a test piece first to be sure.  But if there were old 
> corrugated tin or "tin" roofing about for the taking for very little or no 
> money, I think the weight would be a small issue. I'm a big fan of really 
> really cheap or free if whatever was available actually worked, and then 
> the weight could be looked at as an opportunity for some extra athletic 
> workout (says someone not likely to have to move the showers...)
>
> ttfn
> Therasia, the grumpy uncaffeinated one
> (I can't spell either - cope.)
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