Wall Framing. Oct 27, 2014

Well, there are a few more of you checking out the blog this morning….that is good news for you as I believe there is lots of good info for you there.

Let’s call this an extra post for the module!  We looked at calculating the way to cut studs on a “rake” wall – that is a gable end of a building.  We did this when we were figuring out how to cut the studs on the parapet walls of the sheds. This is a common problem for us carpenters.  If you look around, there are dozens and dozens of gables walls out there, all built by carpenters!

The formula is on the whiteboard:


I know it is hard to read, so I will clarify.

What we are trying to figure out is the difference in length between one stud and the next one.  The formula is: diff = O.C. measure divided by the run multiplied by the rise:

O.C. / run x rise

Seeing as the slope of a roof is always expressed in the run being 12″, and the rise is found in the slope triangle of the plans or can be discovered using your speed square as I showed you, it is fairly easy to do the math.

In the case of a wall with common “on centre” spacings, the the calculated difference will be applied to each subsequent stud.  If the O.C. spacing is 16″, for example, and the slope is 7/12, the the formula would be:

diff = 16/12 x 7 = 9.33 inches or 9-5/16″.  That means each stud will be that measure longer (or shorter) than the one beside it.

Phew….confusing?  Let’s go over it in class if you need to.


About jhcarpentry

I am a teacher in the Construction Carpentry Program at the Chateauguay Valley Career Education Centre (CVCEC) for the New Frontiers School board. This blog is a way for me to connect with my students.
This entry was posted in Uncategorized. Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s