Material Takeoff does not substract Painted Material

[joel.196524]

If you make a wall with brick veneer and then make a takeoff of the brick area it will give the correct area, but let said you paint half of the wall with stone veneer and the brick takeoff does not subtract the area of the new painted stone veneer. This behavior gives incorrect data. 100% Brick and 50% Stone when it should be 50% Brick and 50% Stone. Am I missing something?

[twiceroadsfool]

Yeah.... Dont use the paint tool, lol...

[joel.196524]

It's none sense that you could add but can't subtract painted material. This could really help in quickly calculating material cost without the need to change the wall composition. It's a shame.

[twiceroadsfool]

I agree... In concept its a great tool. Sadly ive found a whole bunch of instances where it bites in the *** though, so i just default to not using it now. Ill make different floors for pattern types, different walls for different finishes, and so on.

[joel.196524]

Thanks, Aaron

[cliff collins]

I just tried a quick example:

Made a simple wall, with several Split-faces.
Painted various materials on the split faces
Created a Materials List/Quantity take-off

The Materials List shows the correct areas of the various materials.
See attached images.

However, I agree that Split-Face and painting is not preferred method, because
wall join edits may delete the Split-faces!!!!!!!

Cheers.......................

[joel.196524]

If you just deal with painted surfaces it will work fine. I agree, I don't like modeling with painted material. But the issue arrived when I modeled a very large home with a lot of brick veneer. I modeled the brick as a wall component, then I had all kinds of roof pitches being cut vertically by second level walls (creating an attic space between the 1st floor ceiling joists and the bottom roof rafters). Then I made a brick takeoff and it work fine, but if you really want a precise takeoff you really need to subtract all kind of finishes (in this case brick and siding) that are inside the attic portion or even the excess brick that exist at any point above soffits with large overhangs. So, I though the simplest way to correct this material excess was to split the faces where brick/siding is not needed and substitute it with a blank painted material, thinking that the painted material will subtract the total amount of the brick/siding and therefore a more accurate takeoff. But it does not work like that.

The other way I can think of eliminating this excess is to mess with the wall's component base / top extension distances. This will work but definitely more time required. Specially, it there is no need to over modeled the project.

The other is to have stacked wall which is no way...too much hassle.

I just discovered this after over 3 years using Revit.

[cliff collins]

The Split-face/Paint method DOES work with a Material List, as I posted an example of.

In your more detailed description, I would actually recommend the stacked wall,
which at first seems like a hassle, but once you use them are very good, as they retain
the material assignments even when wall joins are edited, etc.

Another way would be to build separate walls and then join geometry--again, model it just like it will be built, or the results of the material take-off will not be correct.

The material quantities Revit reports are always a bit misleading--they are mainly good for rough estimating, and not final hardline bids which get right down to the actual cost and quantities of fasteneres, waste, etc,. as a General Contractor would require.

But if quantity take-offs are done throughout the design cycles, with an added contingency factor, you will certainly have a good idea of cost and not be "in the dark" as we would have been in the 2D cadd days.

cheers.........