RTU Curb Bearing on Tectum Deck 1

[RFreund]

Would there be a problem with an RTU/Curb bearing on a tectum deck. Provided there is an angle frame directly below tectum deck at the curb. Basically is there a problem with crushing of the tectum 'panel' that is between the angle and RTU?

Also while on the subject.... What is the norm for a steel deck? RTU to bear on the deck, remove the deck so it bears directly on the angles or provide blocking in the flutes of the deck?
We usually provide blocking to prevent crushing although size/weight may also come into consideration.

EIT

http://www.HowToEngineer.com

 

[SteelPE]

Our detail is to use a channel (c6x8.2) toed down and bear the curb on that. This works with 1-1/2" deck..... Not so much with others. That's not my detail either. I stole it from Fisher.

 

[RFreund]

Ah, yes I think that may be a typical detail of ours as well.

Any thoughts on the Tectum?

EIT

http://www.HowToEngineer.com

 

[SteelPE]

I'm not a Tectum expert but since no one else is offering.... Unless I can prove it can support the load, I would cut it out under the RTU and put a frame in. Hopefully the unit isn't that large.

 

[OHIOMatt]

The Tectum web site has quite a few details available. I have always set the curb directly on a support frame at the top of joist elevation. The people at Tectum have always been helpful when I have called with a question.

 

[RFreund]

I probably should have thought about contacting the MFG however I didn't realize the MFG is was "Tectum"...

Here is their response:

"Design load for compression should not exceed 40 PSI. This allows for most RTUs to be supported through the cementitious wood fiber deck to the angles below. "

I asked about a specific time period so this really doesn't apply:

There were multiple manufacturers of cementitious wood fiber decks in 1970. All unfortunately are called Tectum which is a registered trademark.


EIT

http://www.HowToEngineer.com

 

[RFreund]

Also FYI:

"Tectum deck weight about 21 lb/cubic foot or about 5.25 lb/sqft for a 3” thick panel. Most other cementitious decks were about 35-40lb/cuft."

EIT

http://www.HowToEngineer.com