Hi chaps does anyone know of a supplier of half round black guttering angles where the internal angle is about 150 degrees? all the sheds and=20 builders merchants do is the 135 deg angle stuff, which is too small an=20 angle to fit for bay windows.
The only thing I've found is an adjustable angle thing at screwfix but=20 they're =A320 each!!!!
Any ideas?
dedics
The only thing I've found is an adjustable angle thing at screwfix but they're £20 each!!!!
Any ideas?
dedics
Where I have two buildings meeting at about 200 degrees I sucessfully mitred two short lengths of gutter, glued them with pvc cement, and used normal joiners. Was a bit of a fiddle involving the use of a band saw.
AWEM
The message from Ian & Hilda Dedic contains these words:
Polypipe do (did anyway) fabricated angles but if you don't like the Screwfix price you will be appalled by the cost. I have a 3 year old catalogue and the cost there is £22.85 plus vat for half round.
I think three sided bays are 135 degs
They can be any angle the builder decided to make them between 0 and 180...
A 180 bay would be interesting
*between*
Obviously as the angles *tend to* 0 and 180, the bay shape gets pretty unrealistic .Nevertheless it is *possibible*
To be pedantic between 90 and 180 (assuming the centre bay isn't larger than the opening!). It is generally pleasing for the side bays to separate from the wall at 45deg (easier to mark out as well), making gutter angles all
135deg. 60deg for the leaving wall might not be unusual (giving 150deg gutters) aside from the fact you can't get gutters, I suspect! Was it built originally without gutters perchance?
I didn't assume that. :-)
Its easy enough to glue tow sections of gutter together with plastic weld. Its just D-I-Y rather than B-&-Q...
>
yes, but we've got 5 sided bays, that's why we have a problem.
I don't know, but these last few days we've certainly needed them.....
dedics
And presumably the first section isn't at 90 degs to the wall.
================================== But you might not need it again for another 100 years.
Adding a gutter and downpipe might actually exacerbate the problem since all the run-off would be concentrated into a 3" downpipe which might overflow in storm conditions with possible damage to an adjacent wall. The people who designed your house probably knew that a bay window is best without a gutter. Save yourself some money and enjoy the stormy weather when it appears.
Cic.
correct.
the guttering has always been there but tends to leak at the joins=20 because of stress because you cant get the angle right with the=20 prefabricated fixed angles.
dedics
Well, I guess you're stuck with the Screwfix option, which has to be cheaper than having it made, plus you don't need to know the precise angle. The standard bay is 3 sides of an octagon but I've no idea what the 5 sided is based on. Might be handy to know that if you were getting a quote
=================================== My bays are the 5 facet type. The internal angles are about 143 degrees and the bays are about 10 ft wide internally.
Mine has no guttering and to the best of my knowledge there has never been any. If bespoke guttering is being contemplated it might make sense to make from wood with a lead lining which are two of the easiest materials to work.
Cic.
I obviously don't really understand this. If a 3 sided bay is based on an octagon, 180 - 360/8 =135, the standard gutter angle. The more sides the polygon has, the less that angle should be, so a 5 section bay should be less than 135 degs, not more. Interesting that a bay based on 5 sections of a duodecagon looks like it gives an angle of
120, which does seem to be commercially available. OTOH an angle of 150 would be a 6 sided polygon, so couldn't form a bay. Maybe all this changes if the sections aren't the same size or, more likely, I'm just no good at geometry. I wonder how you become a chippy without GCSE maths.Stuart Noble wrote: I wonder how you become a chippy
You make everything out of regular squares, and 45 degree triangles. And learn that a 3-4-5 triangles is in fact a right angled one.
And when in doubt, ask the architect.
If a 3 equal-sided bay were half a regular hexagon, the angle the first bay section left the main wall would be 60deg and the gutter angles 120deg. 3 sided bays are generally flattened half hexagons, where the leaving angle is
45deg,, giving 135deg gutter angles.For a 5 equal-sided bay, were it half a regular decagon, the leaving angle would be 72deg, giving 144deg gutter angles (different geometry to 3-sided bay). This would give an almost semicircular bay. Flattening this to give (in this case) 150deg gutter angles, would, I guestimate, give a leaving angle of about 60deg, which probably looks "right" for a 5 sided bay.
I think.
================================== I think you're missing the extra side of a bay which is formed by the internal width of the bay.
A 5 facet bay actually has *6* sides when you make it a closed figure. Mine has 4 angles at 143 degrees (approx) and the outer two angles where the outer edges of the bay join the inside wall are each about 50 degrees.
Five of the sides (forming the outer profile of the bay) are 2' wide and the 6th side (internal width of the bay) is about 10' wide.
Based on the formula 2n - 4 right angles ( where 'n' is the number of sides) for the total degrees in a polygon the total should be 720 degrees in my bay but my measurements are obviously not very accurate as the measurements produce a total of 672 degrees. If I took the trouble to measure everything precisely the total degrees would be 720.
Cic.
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