Gypcrete basics

[TDGRAVY]

I'd like to use gypsum-weight concrete (gypcrete) to build up staged seating tiers in an existing building. The tiers will be 3 inches high each. I'd like to use gypcrete at around 40 PCF density to limit the superimposed load on the existing structure. I'll cover the tiers with carpet. Just wondering if anyone can share their experience or knowledge of gypcrete in terms of durability as a floor topping. Use of the space is for people, tables, chairs, light carts, etc.

 

[youngstructural]

No experience with gypcrete, but be careful about the vibrations. Mind you at 3" deep you'll still have some decent weight, however I would worry that you might be trying to span too far.

I'll cross my fingers for you that someone with some gypcrete experience posts...

Cheers,

YS

B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...

 

[Ron]

Gypcrete is not bad as a light duty floor topping. It does not work well in a formed, unconfined application such as the tiers you described. It will likely spall and break off the edges.

Most Gypcrete applications such as floor toppings, have all edges confined with no "free edges".

 

[hokie66]

You could confine the edges with permanent formwork.

 

[TDGRAVY]

YS: the 3" tier additions are to be on top of an existing framed concrete structure, so it's really not spanning or performing structurally - just dead weight to build up the tiers. Cheers. P.S. I wish I were in NZ.

 

[youngstructural]

Hey TD:

New Zealand has notoriously poor house insulation, and it is the winter. It's been below zero (very rare for here), and as a result most of the houses are nearly uninhabitable. It's going to be a horrible winter and I am very glad I am leaving on the 9th.

Just so that you don't feel too put out by not being in NZ... Though it is a lovely country with wonderful people, so I am very melancholy about our imminent departure.

And I would hazard to guess you're not going to have a vibration problem with that much concrete! lol...

Cheers,

YS

B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...

 

[BAretired]

YS,

Don't be too disappointed if your snow covered home doesn't have any snow when you get back.

BA

 

[youngstructural]

Bwahahaha... Nice one BA. I kind of doubt I'll be disappointed, but I can assure you I won't be on the lookout for snow. *smiles*

Cheers,

YS

B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...