"BobK207" wrote in message
oups.com...
On Jul 13, 6:14 pm, "Eigenvector" wrote:
Are roof angles necessarily standard? I ask because I'm going to be
working
on the rafters and need to cut an angle piece to fit in beside the 2x8
holding up the roof.

I measured it out and came out with 9 inches over, 2.5 inches up which
should equal ~15.5 degrees for the roof angle. I'm not interested in
perfection, it just has to fit reasonably, but if I can get it exact it
sure
would be nice. However 15.5 deg doesn't match a 3 in 12 or 4 in 12 pitch
more like 3.5 in 12. That's why I'm asking if roof angles are standard,
or
at least WERE standard in the 1960's.

Just for clarification, my attic is ridgepole construction, 2x8 supports
for
the roof, every other truss has a 1/2 x 10 board connecting the 2x8
supports. Weird construction, doesn't look sturdy at all in my eyes.

My house built in 1930 the roof is bascially 8 in 12 but the
different areas of the roof based on an electroinc level vary from 7.8
to 8.2 in 12

which is 33.0 to 34.3 degrees pretty good for 1930

btw according my clac 2.5 in 9 is 3.333 in 12 which seems like a
reasonable number

Maybe that 1x10 was a construction aid

Nah, those 1x10s every other rafter are part of the roof structure- they
keep it from pancaking. Commonly known as collar ties, IIRC.

aem sends....