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Furring out a concrete ceiling in a high-rise building

jar546

jar546

CBO
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Oct 16, 2009
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Not where I really want to be
None of this is prescriptive. Is it a post-tension slab? Anchoring? Weight of the gypsum? Metal framing connection details?

This is why a set of architectural plans by an RDP is required and you can't just do work that is not prescriptive in a commercial building.

With that being said, who allows metal furring of concrete ceilings without an RDP?Screen Shot 2022-02-17 at 06.31.16.png
 
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Do you require an RDP for installing ceramic tile on the floor of a commercial building?
5/8" gypsum board weighs on average 2.2 lbs per Sq Ft
Ceramic tile weighs between 5-7 lbs per Sq Ft not including the mortar

I am just saying the weight is not an issue but I agree the anchoring and metal framing connections would require a RDP
 
I am with others here. Within my state, State Law requires a RDP (assuming building is >4000sf). That said, some hat-track and GWB are pretty inconsequential when considering dead loads. As MtLogCabin pointed out, ceramic tile with mortar is around 10psf. Granite countertops can weigh considerably more than that (typically around 20psf).

Would I be worried about the loading from the furred ceiling, no. But would I have some concern about protecting the concrete deck, specifically any post-tension strands, absolutely yes.
 
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mtlogcabin said:
Do you require an RDP for installing ceramic tile on the floor of a commercial building?
5/8" gypsum board weighs on average 2.2 lbs per Sq Ft
Ceramic tile weighs between 5-7 lbs per Sq Ft not including the mortar

I am just saying the weight is not an issue but I agree the anchoring and metal framing connections would require a RDP
Click to expand...
We don't require an RDP for tile but we do require a permit due to the sound attenuation requirements on high-rise and commercial buildings.
 
mtlogcabin said:
Do you require an RDP for installing ceramic tile on the floor of a commercial building?
5/8" gypsum board weighs on average 2.2 lbs per Sq Ft
Ceramic tile weighs between 5-7 lbs per Sq Ft not including the mortar

I am just saying the weight is not an issue but I agree the anchoring and metal framing connections would require a RDP
Click to expand...
Agreed. And also, doesn't the existing building code allow for 5% and 10% horizontal and vertical loads increased without full evaluation of the building?
 
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