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Monolithic Slabs

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cbe
cbe's picture
Monolithic Slabs

How should I approach a monolithic slab?  Considering I can add footings to the wall type and/or add footings in the floor system mode, I am a little confused on the best method.  My initial thought is to draw a structural slab in floor system mode, then manually draw the footings under my load bearing walls.  Also, I need to add a brick ledge to the footing; 1.5" deep, 5.5" wide (see pic below)

 

TIA

- Cory

Bill Wimberley
Bill Wimberley's picture
Monolithic Slabs

Cory, for a slab the best method is to draw a Structural Slab. For your interior slab beams use Slab Footings.

To get the recess on the edge edit a slab edge and select Recess Wall Above. Enter the desired depth. After you edit one edge you can use Repeat Edit Box to make the same change to all the other edges of the slab. Make sure that Recess Surface Only is checked or the studs will be included in the recess as well.

This does create a recess and the exterior material will drop down into the recess but the recess is only as deep as the exterior surface material. So if your brick is 3 1/2" thick and you set your recess to 1 1/2" then you will get a 3 1/2" x 1 1/2" recess on the edge of the slab. If you want the recess to go all the way to the stud then you will need to edit the cross section after you save it.

If all you want is a 2D detail, similar to the picture you used, you can also use Draw--> Detail--> Section Detail--> Slab. Draw a rectangular shape and then edit it to get the exact shape you want. To access all of the options for the slab detail you will have to edit it and then check Structural Slab. Then you can edit slab thickness, footing size, recess, etc.

 

cbe
cbe's picture
Here's a couple issues I have

UPDATE:  I found an old thread on SPLASH that showed me how to use Edit Item to edit the slab edge against the house and turn off the footing.  This also allowed me to edit the footing size of the 3 remaining footings.  I also, snapped the left & right reference points to the brick ledge and this makes the slab the correct width.  However, I am still having an issue with the depth of the porch slab. (See pic at the bottom.) If I use the Set Distance Between function on the porch slab and the house slab, the porch slab will adjust, but the footing does not. 

 

 

Here's a couple issues I have with the slab/footings so far.  The attached pic is of a porch that I am drawing on a slab house.  I created a Structural slab in floor system mode then manually added my interior footings.  All is well up to this point.  However, when I go to add the slab for the porch and garage I run into a few problems.  I want the porches and the garage to have a 4" drop from the main slab.  Also, the porch requires smaller footings.  I note this because I assume this prevents me from drawing everything as one slab.

 

issue #1 - when I draw the structural slab for the porch, it draws footings on all four sides of the porch.  I only need footings on the 3 sides that don't touch the living area of the house b/c there is already a footing there.

 

issue #2 - I can't adjust the edge of the slab like I need.  Whenever I adjust it, it snaps back to be even the beam location overhead.  I want the sides of the porch slab to line up with the brick ledge on the house.

 

I know I am not the first person to draw a porch and garage so I know there is a simple solution.  However, I can't seem to find it.  So... thanks in advance for any help.

 

 

 

UPDATED PIC

Bill Wimberley
Bill Wimberley's picture
Monolithic Slabs

Hey Cory,

I see from your second pic that you were able to edit the edge of the porch slab and turn off the footing. To make that easier you can adjust the overlapping control points from the main slab and the porch slab so they aren't right on top of each other.

Let's also look at another issue you did not mention. How do you get the slabs to be at different heights? For that you need to use Levels. Levels allow you to set the offset for all slabs that belong to the same Level. So in the slab you illustrated you would give the main slab Level 1 and the porch slab Level 2. Then you can change the offset for the porch slab and drop it down without it affecting the main slab.

I always set my main slabs to be offset 4" down. This is because I want the Top of the slab to be at 0 elevation. But SoftPlan puts the bottom of the slab at 0 by default. So by setting the offset down 4" the slab drops so that the top is at 0. The only reason I do this is because it is easier to keep all my wall heights where I want them. If I look at the plan in Roof mode and have Plate Heights turned on I want to be able to see the height of the wall above the slab, not the height of the wall that has been offset up 4" to get on top of a slab that is up 4".

So I would set the main slab to Level 1, offset down 4". And I would set the porch to Level 2, offset down 8". This gives a porch slab which is 4" below the main slab.

If while in Floor System mode you select the Options tab and then Visible Items you will get a settings page. At the bottom of this page find "Show Joist Level" and check it. Now your Levels will each have their own color. This makes it easier to see what slab is on which Level. Everything that is on the same Level will have the same color.

On the front edge of the porch the control point is snapping to the beam. But that is not where you want it and you can not get it to stop snapping to the beam. The solution for that is simple, but maybe not very obvious. Simply drag the control point off to the side away from the beam. As long as there isn't anything near the control point for it to snap to you can place it anywhere you want it.

cbe
cbe's picture
Bill - Thanks as usual.  Next

Bill - Thanks as usual.  Next question... How do I get the porches to count in my gross area in 'Area' mode?  Am I correct in thinking that I need to do a manual trace and use the same method as drawing the slab, but moving the reference points?

Bill Wimberley
Bill Wimberley's picture
Areas

Since area Auto Trace only works for areas completely enclosed by walls you would have to use Manual Trace to do your porches. Also, after you trace your area make sure that the area polygon is attaching to the correct locations on all of the walls and/or beams.

Depending on your set-up you may need to change the area wall reference setting. If you edit the area you will find selections for Exterior Edge, Outside Bearing Edge, or Interior Edge. Select the appropriate setting and click OK.

If for some reason you can not get the areas to work properly, for instance if you selected Outside Bearing Edge and there are areas that just will not go to the correct side then you may need to drag the control point off to the side away from the wall. This can happen if you have certain beam configurations and the exterior of the beams are on one side but you want the area to measure to the other side of the beam.

cbe
cbe's picture
Thanks.  That clears it up a

Thanks.  That clears it up a bit.  I assuming you are doing all of this in the Floor System mode?

 

 

Bill Wimberley
Bill Wimberley's picture
Monolithic Slabs

Drawing the Structural Slab and Slab Footings and then editing the slab edge are done in Floor System mode.

The cross section was done by drawing a Section Line through the plan in Drawing Mode. To draw a Section line select Shape--> Section Line under the Draw tab. You can also find Section Line and Section Poly Line under the Model tab. After drawing a section line you will see the letter of the section line listed on the left side of the page under Cross Sections, Views. If you double click on the cross section letter under Cross Sections, Views a window will open up and generate a cross section of the plan at the section line. Select File--> Save-As and give it a name to convert it into an editable drawing, like the one shown in the 4th image. If you need more detailed instructions let me know.

The section detail in the last image was done in Drawing Mode.

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