Miami Beach, Champlain Towers South apartment building collapse, Part 16 24

[dik]

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Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Jeff Ostroff]

Zebraso, it's a bit confusing actually. The deck below might be sloped, and the pavers are also sloped so everything is OK. OR, the deck below might be flat and unsloped when the pavers up top made up for it by sloping the sand layer to create that 1/4" per foot slope.

But Morabito stated in his report the architect had a flaw in his design, of no slope. That is false because the floorplan clearly shows the slope in the 1979 drawings on that pool deck That is what I was puzzled about why he stated the architect scared that up when the drawings clearly show the slop in it. So we will never really know. Morabito provided no photos showing a flat spirit level on the actual as-built pool deck slab, to confirm his claim.

 

[zebraso]

Things that make you go HMMMM. How many places has it been reported and repeated that the level deck is one of the original sins in the as built.

Edit: it's a bit unclear to be now whether the claim was that the structural deck has no slope or is insufficiently sloped as built. I'm not sure it matters. I mean the deck as constituted by the cores that were taken.

 

[SFCharlie]

I don't know when the elevations were taken, or what the units are, but I assumed (Yes, we know what that makes you and me) inches. that would be only 9.8 to 9.5 = 0.3 inches slope across the whole pool deck?

 

[Jeff Ostroff]

If you look at any of the drawings of the pool deck area, you'll see the deck field drains are about 20 feet from the pool, so we need 1/4" x 20 feet, which is a 5" slope from the pool down to the drain.

Also, if there is lippage between the pavers, that could inhibit the downward water flow. One of the great ideas Morabito had was to add grout between the pavers. This would, in my opinion, help reduce the amount of water going down between the pavers, as the grout provides a smooth pathway down to the drains for the water to run down.

BTW I am working on a new video covering some of this, and other item, the settlement, the lost first responder audio files, and some new theories I have on what could have caused the planter to crack in the Miami Herald photos

 

[zebraso]

Since I have been throwing around the term "structural deck" without reviewing the core samples I have revisit my characterizations.
Looking at the report on the cores I can see they have identified the structural slab, topping slab, tile and mortar layer (sloped), water proofing, sand and paver. Apparently the sand and paver are not actually in the core sample as shown even though they they are listed.
So I think what I should have said is structural deck, topping, tile and mortar, for the original slope - or what was under the water proofing.

 

[Sym P. le]

... when the elevations were taken, or want the units are, ...

The drawing is from Morabito's package for remediation. A note on the drawing states the elevation survey was conducted on 08/07/2020. Units are decimal feet as far as I can tell.

 

[SFCharlie]

decimal feet

Thanks. So .3 feet is about 4 inches, close to the 5" Jeff needed...

SF Charlie
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[SFCharlie]

The drawing is from Morabito's package for remediation.

Do you happen to have a pointer to this file? Thanks

SF Charlie
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[Sym P. le]

See attachments split into three parts

The elevations are on page 71 in part 3

Or use Town of Surfside Public Records Search

 

[Sym P. le]

Part 2

 

[Sym P. le]

Part 3

 

[Reverse_Bias]

I'm sure you can georegister it in QGIS type in the values manually and get a contour plot if you have the time.

https://www.geodose.com/2018/05/how-to-create-contour-lines-in-qgis.html

 

[FJBnomics]

Probably already been discussed, but looking thru SymPle's repost the South Wall Detail caught my eye. The only Section View I see where Morabito was planning to do repairs at South Wall, was the privacy part of wall on top of deck slab.

He just shows Patio Deck Slab, Edge Beam and garage wall as existing, with no indication of repairs to South Wall, other than Block Privacy Wall on top of deck slab.

This indicates no visible signs of problems when Morabito did his original field data collection to base repairs design on?

8.7.20 Survey also shows elevations good at South Wall.

Last page in SymPle's first attachment above.

 

[SFCharlie]

Thank you very much!

SF Charlie
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[SFCharlie]

This indicates no visible signs of problems when Morabito did his original field data collection to base repairs design on?
8.7.20 Survey also shows elevations good at South Wall.

1. Maybe he did not dig out the gravel outside the wall?
2. The issue at the south wall is not that it dropped, it is that it release tension on the pool deck, allowing it to droop ("bend or hang downward limply.").


SF Charlie
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[FJBnomics]

With the amount of corrosion shown in pictures after collapse, at South Wall, it seems there would have been more spalling of concrete in that area?

 

[Sym P. le]

2. The issue at the south wall is not that it dropped, it is that it release tension on the pool deck, allowing it to droop

The issue of the slab dropping at the south perimeter is a product of the MH exposé.

The idea that it released tension is a misnomer as it never was tied in to the perimeter wall as though anchoring a tightrope.


Morabito's idea of an edge beam would seem to be wishful thinking.

 

[Reverse_Bias]

The issue of the slab dropping at the south perimeter is a product of the MH exposé.

It appears to be in this photo.

 

[FJBnomics]

If I did the math correct the deck around the pool at the south privacy wall, at block column, on the West side of hot tub is 10.22 feet elevation, and like 3 feet away the elevation of finished top pavers is 9.94', or a slope of 3.36" over say a 3 foot distance, assuming 12" pavers.

I know they raised the finished paver floor height around the pool when they raised and rebuilt the pool edge gutter system.

 

[SFCharlie]

that it released tension is a misnomer as it never was tied in to the perimeter wall

His video clearly shows rebar broken at the slab wall interface, and in a few cases short rebars "zippered" from the slab? Farther back, we see full length rebar zippers.


SF Charlie
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