Heel Heights

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Larry
Larry's picture
Heel Heights
SoftPlan Version:
2014

As I change pitch of my roofs, I have noticed that the heel heights change to the point that sometimes walls are sticking up thru the roofs.  In the past, I have simply adjusted the walls to fit roofs and let the framer figure it out.  

In an attempt to better my product, using harder to find, competent framers, I want to attempt to predetermine correct rafter sizing.

I have a program that I downloaded for my Iphone and Ipad from Home Depot.  It takes stairs and rafters and by filling in the span and pitch, will show every dimension of the rafter or stairs in multiple drawings.

It will specify the heel height and the vertical cut as well.  Am I correct that I, as a draftsman, supposed to determine heel height for each roof I draw?

I remember a long time ago, and I still have it, a spread sheet that was on Spline or Splash to determine the heel heights, but I cannot find anything in Softplan that can do it for me.

Bill Wimberley
Bill Wimberley's picture
Heel Heights

Larry, check out the tutorial Understanding Heel Heights. There is also an informative discussion in the comments section under the tutorial.

Bill is the owner and maintainer of SoftPlanTuts.com

Larry
Larry's picture
So, Generally speaking, a 4 1

So, Generally speaking, a 4 1/2" heel Height for a 2x6 and a 6 1/2 for a 2x8 would be appropriate?

 

Bill Wimberley
Bill Wimberley's picture
Heel Heights

I generally want the bottom of the rafter to be at the inside of the wall so I start out by adjusting the seat cut to be 3.5" and use the heel height as a check to make sure that the birdsmouth cut isn't too deep. Then if there are pitch changes I adjust the overhang to maintain the seat cut, again watching the heel height to make sure it doesn't get too deep. But different designs and conditions require varying techniques.

cbe
cbe's picture
Is there a way to anchor the

Is there a way to anchor the seat cut at 3.5"?  That is the norm here and every roof I draw has a seat cut of 3.5".  However when I start editing the roof while designing I am constantly have to reset the seat cut back to 3.5"

- Cory

Bill Wimberley
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Seat cut

Nope. When you change the roof pitch the fascia remains constant. Therefore if you increase the pitch the rafter raises up off the wall and if you decrease the pitch the rafter drops down on the wall. You would then need to adjust the overhang in or out in order to maintain the same fascia height and get the seat cut back to where you want it. It would be nice if you there were some check boxes that you could select that would allow you to say, for instance, when I change the pitch I want the seat cut and the fascia elevation to remain constant and automatically adjust the overhang.

Larry
Larry's picture
Thanks, learned a lot.

Thanks