Creating roof on raked walls

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Brad Johnson
Brad Johnson's picture
Creating roof on raked walls
SoftPlan Version:
2014

Am designing building where all four corners of building are at different heights and walls rake to those corners' heights.

(Simple example would be: rear right corner at 8-ft; rear left and front right at 9-ft; front left at 10-ft.

How does one go about putting a roof (w/ 1-ft overhang) on this beast to follow raked walls?

 

Thanks in advance.

Brad Johnson

Bill Wimberley
Bill Wimberley's picture
Roof on raked walls

That's a tricky one.

In your description the bottom right is 8'. Bottom left and top right are 9'. And top left is 10'. So the bottom right is your low point and top left is the high point.

Start off by drawing a diagonal line from the low point (bottom right) to the high point (top left). This is the direction the roof will be sloping. Draw 2 beams perpendicular to this line and place one at the top left and bottom right corners. Set the top of the top left beam at 10' and the top of the bottom right beam at 8'

Repeat for the other two corners by drawing a diagonal line, beams perpendicular to this line, and setting both beams in the corners at 9'.

Draw a line the length of the perpendicular line. From one end point draw a line perpendicular to this line and make it 2' long. Then draw a line back from the other end of the 2' line to the other end of the first line, creating a triangle that is the length of the perpendicular line across the house and one side is 2'. The angle of the hypotenuse will be your roof pitch. You could also do this using the SoftPlan calculator rather than drawing lines.

So now you have beams set at all four corners and you know the pitch. Trace a roof around the house, connecting to each of the 4 beams. Make the connection at the bottom right beam a hip with the pitch previously calculated. Make all other edges Gables and turn off Gable end provided by roof.

Draw lines around the perimeter of the house 12" away from your walls, the overhang you stated.

In Roof Mode make the lines visible. Use Trace Hole to cut away the portions of the roof outside the lines.

Edit the beams, set to Hidden, and uncheck Extract in Model.

Note that this will get you close to what you are wanting. Depending on the shape of the house it may require that you do some additional calculations and use a double hip with 2 pitches. For instance you may need to have a valley going from 9' beam to 9' beam. But without seeing the design I can't give you an exact method.

 

Bill is the owner and maintainer of SoftPlanTuts.com

JasonDentDesign
JasonDentDesign's picture
So Bill I've never cut out a

So Bill I've never cut out a roof yet, and will on current practice project (that has generated all my questions)on my own home, is the drawing of the lines for the purpose of a guide for cutting the roof? I wondered how one would do that. I've utilized the overlay feature to assist plenty but wonder how you would know exactly where to cut a roof to add say/ compensate for, a dormer or a second storey bedroom addition on a bungalow.

I also must give kudos to you for all the time and effort you put in to helping others. I am full of admiration for you (and others on here) that take the time to assist the stranded. I can only hope to grasp this software as you all have and repay it back...in drinks or advice...lol. Thanks again to you and the TUTS GANG for helping my learning curve.

All the Best and Prosperity -Jason

P.S there was a question in there..lol

Bill Wimberley
Bill Wimberley's picture
Cutting Roofs

Hey Jason. There are a number of hole cutting tools that can be used depending on the situation. For something like a dormer I will typically use Auto Hole. With Auto Hole you first select the roof that you want to cut the hole in and then click on the roof that you want to do the cutting with, such as a dormer roof.

There is also a rectangular hole for cutting rectangles and trace hole for cutting irregular shapes. With all these tools you click on the roof you want to cut the hole in and then draw out the hole.

In the example above with the odd roof there was nothing to use as a guide for cutting the roof to give it a 12" overhang so I just drew in lines to use as guides. After the holes are cut out I delete the guide lines.

 

JasonDentDesign
JasonDentDesign's picture
Perfect thanks. I'll give it

Perfect thanks. I'll give it a try once I get back to that. Thanks so much!!!

Brad Johnson
Brad Johnson's picture
Bill,

Bill,

Wanted to get back to you to say "Thanks". Helluva work around but your instructions did it. I'll try to post the end result when I have a chance.

 

Brad