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Pour new concrete floor over old concrete slab
Hello,
I have a cold garage (9x6m) from the 1940s with a concrete ceiling and a workshop above.
The concrete ceiling is about 150mm thick and has embedded I-beams 60x120 cc 800mm.
In the middle of the garage, there is a transverse beam under the ceiling with the same dimension and a pillar in the center. Most likely, the main beams are spliced over this.
The casting seems to consist of larger crushed stone and no reinforcement.
On top of this old ceiling, I plan to insulate 100mm and cast in floor heating in 100mm concrete reinforced with mesh cc150.
Will the old ceiling be able to withstand this additional stress during the work? - Can I consider the 100mm concrete floor to be self-supporting, or do I risk that it puts strain on the old ceiling's strength in the long run?
Grateful for tips if anyone has experience in the field...
Stig Andersson
I have a cold garage (9x6m) from the 1940s with a concrete ceiling and a workshop above.
The concrete ceiling is about 150mm thick and has embedded I-beams 60x120 cc 800mm.
In the middle of the garage, there is a transverse beam under the ceiling with the same dimension and a pillar in the center. Most likely, the main beams are spliced over this.
The casting seems to consist of larger crushed stone and no reinforcement.
On top of this old ceiling, I plan to insulate 100mm and cast in floor heating in 100mm concrete reinforced with mesh cc150.
Will the old ceiling be able to withstand this additional stress during the work? - Can I consider the 100mm concrete floor to be self-supporting, or do I risk that it puts strain on the old ceiling's strength in the long run?
Grateful for tips if anyone has experience in the field...
Stig Andersson
Regular concrete weighs about 2100-2400kg/m3. The question is whether the person who designed the garage roof designed the floor for that load. Then there is lightweight concrete you can use, which is significantly lighter but has lower strength. As anaitis said, I would consult an engineer or similar to find out the strength and quality of your floor, cracks, corrosion, if reinforcement is present, etc.
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