Concrete First Floor

scarriff

I want to put in a concrete first floor and have heard that a cheaper option to a precast slab would be to be do a cast in situ using the timber joists as a basis for the deck.

I would like to hear from anybody who has done this and what the design spec was?

Quazzie

A cast in situ floor can in most cases as you say is a much cheaper option. The main problem with this is that every floor is different, different spans, different dead loads, different live loads, different point loads. Because of this, each floor has to be specifically designed by a structural engineer, who will dictate what grade concrete to use, what grade steel to use, the quantity of steel, the depth of the concrete required and the grade and centres of the timber for joists. Additional steel may also be required depending on spans and loading.

The only answer yoy will honestly recieve here is you won't know the price difference until you can get a spec from a qualified fully insured structural engineer.

SHORT ANSWER. In most cases yes it is cheaper, but every case is different.

scarriff

Quazzie wrote: »

A cast in situ floor can in most cases as you say is a much cheaper option. The main problem with this is that every floor is different, different spans, different dead loads, different live loads, different point loads. Because of this, each floor has to be specifically designed by a structural engineer, who will dictate what grade concrete to use, what grade steel to use, the quantity of steel, the depth of the concrete required and the grade and centres of the timber for joists. Additional steel may also be required depending on spans and loading.

The only answer yoy will honestly recieve here is you won't know the price difference until you can get a spec from a qualified fully insured structural engineer.

SHORT ANSWER. In most cases yes it is cheaper, but every case is different.

Thanks for the reply I will get a structural engineer to design. I suppose prior to doing that I would like to hear from anybody that did this already and what additional work is involved compared to placing a concrete slab in place and placing a screed on same.

I will get an experienced concrete guy to do the deck and pour the concrete however I would like to get a brief description of what is invloved and what safety procedures are put in place to ensure the floor is level and smooth. I understand how the deck is propped with acro's but would the entire floor be poured at once? if so how would this be screeded if the width of the floor is 12mtrs and an overall area is about 150sqm, is poking required?