Top Chord Bearing Truss

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Top Chord Bearing Truss
SoftPlan Version:
2014 Plus

Is there a way ( settings ) to show a Top Chord Bearing Truss ?


I drew a dual pitch scissor truss where the front wall is shorter than rear wall so an 8/12 front pitch and 4/12 rear pitch.  The truss company already

told me that the heel height for these trusses would be around 20" but if I wanted to do a Top Chord bearing truss I could reduce the heel height to

10".   When I place a bottom chord bearing ( 20" HH ) truss ontop of my walls it leaves the truss ends open below my soffit due to the tall heel height

vs top to facsia measure. 

In real life I could just extend the wall sheathing up the wall to close in those areas.  But for Softplan

drawing purposes it looks better to have the walls above the soffits so that the siding and corner boards extend up to where they should go.   I'd like

to do and show the Sections with Top Chord Bearing where the bottom chord of the trusses drops down inside the walsl.  When try I change the heel

height to reflect a Top Chord Bearing situation it wants to change

the overall depth of the truss as well and not just the heel  height.  In other words it now reduces the whole truss depth in accordance with the heel

height.  Is there someway in SP settings to make it recognize that what I want to do is a Top Chord Bearing style and I do not want to reduce the

overall depth of the truss but just the heel height.


Bill Wimberley
Bill Wimberley's picture
Fit to Soffit

Jim, if I'm reading this right you are wanting to extent the siding and corner boards up to a soffit which is above the tops of the walls. Is this correct? If so then all you have to do is edit the walls and check "Fit to Soffit" and the siding and corner boards will adjust to meet the soffit.


Bill is the owner and maintainer of's picture

Bill, thanks the Fit To Soffit is half of the solution which solves the siding/corner board issue.


The other half is how to draw a parallel chord sissor truss that is top chord bearing.  A scissor truss due to it's depth could have a very large heel height, and

to reduce the heel height it can be designed so that rather than the bottom chord ( bottom ) of the truss bearing on the wall, rather the top chord of the truss

bears on the wall, so much of the depth of the truss hangs down below and inside the face of the wall and top plates.   That is what I'd like to know how to do

in SP so it will show properly in Section without having to hand draw it in after the fact.


JimC's picture
Trying For Larger Image

Trying ?'s picture

Forgot to adjust the arrow in the ( second ) Top Chord Bearing illustration to point at the top plate to show that it's the top or upper

chord that bears the weight.


It's been one of those days !!!!!  



Bill Wimberley
Bill Wimberley's picture
Adjust your ceiling

Set your heel height how you want it to be for the roof. Then for your ceiling set the elevation to be below the tops of the walls by adjusting the ceiling offset elevation. The trusses will follow the shape of the ceiling so the more you offset your ceilings down the deeper the truss will be.'s picture
Adjust Your Ceiling

Ahh, why didn't I think of trying the ceiling setting ?


I know darn well that the shape of the roof structure will follow the ceiling shape but never thought

of the offset factor coming into play !  I'll give it a shot and let you know how I make out !  


BTW, how much is my bill getting up to now for all your help :-)


Many Thanks!


Bill Wimberley
Bill Wimberley's picture

Let's see...according to QuickBooks we are at... carry the 2... applying discounts... add extra 20% surcharge for being Canadian...  Looks like we are right at $0.00. I take check or PayPal.'s picture

Lucky for me the fees were so reasonable in the first place or that 20% Canadian surcharge could of done me in ;-)


Since the hard currency is at zero I guess all I can offer you is my many thanks !