G'day and welcome back to Buildsum and in this video I'm just gonna go over the
speed square and how you can use it to get your different angles and how to use
it to get your plumb bevel hip and plumb bevel common rafter, okay so obviously
here's a speed square this is a metric version so down this side of the square
it has metric increments you can get them with inches but obviously depending
on what you're using commonly that's the one you need okay it has a little pivot
point here against the stock of the square and over on this side it has all
the angles or the degrees that we've need for a roof from 0 through to 90 and
in the center here and has a scale which is based on the old imperial system what
the Americans still use which is based on rise in inches per foot so this is
one inch rise over a foot and you can see once you get down to 12, 12 inches
over a foot which is also 12 inches gives you 45 degrees so we can use these
two scales here the common cuts and the Hidden Valley cuts to get our plumb
bevel common rafter and convert it to the plumb bevel for the hip and Valley
rafter okay but they are based on the old american imperial system okay so
it's not metric but it still works for what we want to do okay so the actual
square itself obviously you can use it to get us a 90 degree line and a 45
degree line just by holding the stock of the square against the edge of
the timber the great thing about this square is you can use the pivot point
here and pivot the square around until you get to one of these angles here like
this so I've pivoted this around to 30 degrees
that means that if I draw a line from my pivot point across the timber that will
be a degree angle okay similar to if you were
to set that up on a drop saw and cut a 30 degree cut on your dropsaw or you'll
get the same angle okay so that's good for getting your plumb cut of your
common rafter if you know your roof pitch is 30 degrees you just rotate that
to 30 degrees and that will give you your plumb cut for your common rafter to
get the plumb cut for your hip or your valley what you can do if you have
a look here you'll notice that that 30 actually lines up with the 7 here so
that's 7 inches over 12 or 7 inches
rise per foot okay and that's on the common rafter side of the scale okay so
if you wanted the plumb cut for your hip at a 30 degree pitch for the main roof
you would rotate the square around till you got to the 7 on the hip and
valley side okay so I've rotated that around now and
on this side of the scale the hip and valley side I've got that on 7 so
that will give me the plumb cut over here for my hip member okay
so 30 degrees lines up with 7 okay that's 7 inches put over twelve
7 inches per foot that gives you your plumb cut common rafter and if you
line up the 7 on the other side of the square of this scale that's that
will give you the plumb cut for your hip and Valley rafter okay and then the
other one you can do you can get your level bevel so if you know you've got a
pitch of 30 degrees take that away from 90 gives you 60 okay so you've
got 60 degrees left you can flip your square over rotate that around to 60
degrees and that will be your level bevel for your common rafter okay level
bevel for your common rafter okay so there you go there's the speed square
and the bevels that you can obtain or the way you can use it to get your
bevels for your plumb bevel common rafter and your plumb bevel hip
G'Day i'm back just let you know that if you like this video you can subscribe to my
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