Subject:
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Slopes: 25 degree or 33?
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Newsgroups:
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lugnet.general
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Date:
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Tue, 26 Nov 2002 00:07:59 GMT
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Viewed:
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390 times
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Just wondered why 'we' call nx3 slopes 33 degree, while TLC on S@H call them
25 degree slopes.
Measuring the actual slope I get 25.7 degrees *1].
Doin' the math for the effective slope I get 31.0 degrees *2].
Although both 25 and 33 are a bit off, there seems to be a case for either
one. My favourite would be 31/33 degrees, as that's the average slope you'll
get in your roof. Any other opinions on this?
For the 45 degree slope the math result for the effective slope is 50.2
degrees, and measuring the actual slope gives 43.9 degrees. So here I'd
favour calling them 50 degree slopes (though I know there's not a hope in
hell the name 45 degree slope is gonna change). TLC simply call them 'steep
slope' in the bulk section.
*1] That's using a scan I did the other day for Clark Corners archive of a
1x3 slope, drawing lines along the edges and letting Paint Shop Pro measure
the actual angles.
*2] With bricks having a ratio of 6:5, the 2(hor) x 1(vert) step these
slopes make gives a 6:10 ratio for the slope. Using the inverse tangent on
my calculator tells me that's an angle of 30.96375653 degrees.
Duq
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Message has 1 Reply:
 | | Re: Slopes: 25 degree or 33?
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| Have you tried to make the readings with *a roof*? I mean, not an isolated slope - but a number of them in sequence. I figure that you may read an angle closer to 33º if you try it that way. That would be caused by the slight "step" (~1mm) on the (...) (22 years ago, 26-Nov-02, to lugnet.general)
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