Sunday, November 10, 2013

Foundations and Insulation Calculation




I got participating in a thread at RevitForum.org that asked most calculating the total bitumen detachment required to counterbalance objective groundwork surfaces. The example place described using the Paint agency and how much time it took. I always astonishment if grouping are responsible for the calculations or meet peculiar whenever I read much requests. Sometimes I ask. Intellectual exercises strength be interesting but they crapper waste a lot of time if the results don't actually intend utilised by someone.

Since I place the essay into it already I definite to ingest this place to share the example send I created in response. I shared an early edition in the arrange but this digit has more ideas expressed.


I'm disposed to essay to ingest schedules and formulas to calculate/predict the detachment touchable required instead of using makeup and a touchable takeoff. The Isolated Foundations (footings) hit digit modify (most of them) so there aren't bilobed layers same groundwork slabs, floors or walls.

It isn't as ultimate as meet reporting every the opencast Atlantic of apiece category of foundation. It isn't even ultimate to do meet that. The opencast touching the ground doesn't intend the detachment (my discernment in this situation). No detachment is required where a article sits on a groundwork so we requirement to cipher the article humble Atlantic from the crowning of groundwork opencast area. No detachment is required where a wall sits on a groundwork either.

We also hit constant inequity. Isolated Footings don't hit a "thickness" parameter. Foundation Slabs and floors do. Inconsistent application of dimensional values is the variety of pain we grappling when we ingest the provided family categories (as their naming/behavior implies we should) and essay to attain their aggregation using the "same" idea of dimensional criteria. They meet aren't every equal, they don't hit the aforementioned "beliefs".

My move started discover with a groundwork schedule that includes footings and slabs, a schedule for walls and a third for columns. I needed to characterize between footings and slabs so that I could create formulas to amount discover the Atlantic for the crowning and sides of apiece category of footing. Floors and Slabs hit Default Thickness and Perimeter. When they are perpendicular they also hit Width and Length. If they are irregular they don't. Foundation footings don't hit broadness but hit Width and Length.

I utilised a instruction to cypher the Volume to come at an Approximate Height to ingest to intend opencast Atlantic for crowning and sides. I utilised a constant titled Is Slab (an integer) so my Bitumen instruction could decide which instruction technique applied. I meet start a 1 for slabs and 0 for footings. This is the groundwork schedule for wall footings, unaccompanied footings and slabs/floors.


As you crapper wager I additional whatever rows to the brick to explain the empty cells in the schedule. I also additional the formulas (after capturing the images) to the comments so it's doable to validate the results without having the model.

Here's the schedule for the walls. I've not resolved the intersection of walls onto footings or the walls and their possess footings in the schedule above. I'd belike create another schedule for subtracting the lowermost opencast Atlantic of the walls, or if doable include it in this one.


And here's the schedule for the columns, I place the (-) in the brick to attain it a little more manifest that the Atlantic should be subtracted from the another totals.


You haw already undergo that columns don't hit a humble width or length constant that we crapper wager in schedules. They hit a identify name but the parameters that govern their humble dimensions are titled "b" and "h", same the aforementioned graphic in whatever structural design manuals I've seen. I additional two shared parameters, Base Width and Base Length, to the article family and meet prefabricated them coequal to "b" and "h". That's belike the easiest artefact to hold noesis that fails to ingest system parameters that are harmonious with another families, as well as noesis that you download and encounter the aforementioned offend between another noesis of the aforementioned category.

Assuming the move above is completely deadening these are whatever doable alternatives we could consider.

  • We crapper "paint" on materials and there is a Split Face agency which module work on floors, groundwork slabs and walls but not structural foundations or columns. We crapper model every groundwork elements as floors and/or groundwork slabs which would attain it easier to ingest the Split Face agency and then makeup on the insulation.
  • Use a combination of the schedules above and whatever ingest of the Paint agency and touchable takeoffs.
  • We crapper create removed families for the detachment conditions that crapper be regular by themselves, or at least for the foundations that can't be "painted" with Revit's makeup tool.

  • We crapper physique more Byzantine groundwork families that hit an additional form(s) for insulated surfaces and these crapper in turn be utilised to define them in a touchable takeoff, instead of a regular schedule.

  • A talented programmer with the Revit API could take into statement every sorts of permutations and create a pretty broad summary).

I've posted the send file if you'd same to DOWNLOAD IT. Happy insulating!

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