Hello everyone,
Great forum here, I’ve already read quite a bit! I will post an introduction thread soon, I just need to get my bearings with all the great contributions!
I would like to gather some additional opinions on how best to design my floor structure.
The planned building is a storage room of nearly 110m² (1,184 sq ft)!
The footprint is rectangular, measuring 13.5m x 8.5m (44 ft x 28 ft)!
It will be used for storing vehicles and trailers, and it will be heated!
The existing structure will be demolished in the coming weeks, and the required area cleared. We have a high groundwater level; after digging 1.5m (5 ft), groundwater appears.
My current idea: I will excavate the entire area down to -70cm (-28 inches) level. The first 30cm (12 inches) will be filled with 0-63mm (0-2.5 inch) rolled gravel. On top, a finer, water-permeable layer with 0-32mm (0-1.25 inch) crushed stone will be applied. Then, I plan to lay a PE foil, and cover the entire area with 10cm (4 inches) XPS foam insulation boards. Above that, a 30cm (12 inches) thick concrete slab will be poured, which I will order as high-quality ready-mix concrete depending on your recommendations, possibly as a waterproof (WU) concrete slab if advised.
Here is the sketch:
I would appreciate your tips and experience regarding the slab under a storage hall / storage room!
On the slab, a vapor barrier using aluminum-laminated bitumen membrane will be installed against the wall; I plan to build the walls with 30cm (12 inches) concrete block formwork stone. The walls will be about 360cm (12 ft) high all around and insulated externally with 8cm (3 inches) rigid XPS foam boards. On top, there will be a foamed trapezoidal sheet metal roof weighing approximately 16kg/m² (3.3 lb/sq ft).
This is my current plan; the submission drawing has already been approved by the builder and is currently with the local authority for review before the building permit/planning permission hearing.
I need your experience regarding the floor construction!
Specifically, I am interested in the following:
Installation of underfloor heating – does the 120m² (1,292 sq ft) slab need to be equipped with expansion joints? If so, what are the requirements?
A 30cm (12 inches) concrete slab reinforced with double AQ50 steel mesh, or should I order fiber-reinforced concrete instead?
Is the floor assembly I proposed detailed enough, or is it undersized?
Thank you very much for your ideas,
best regards from Austria,
Robert
Great forum here, I’ve already read quite a bit! I will post an introduction thread soon, I just need to get my bearings with all the great contributions!
I would like to gather some additional opinions on how best to design my floor structure.
The planned building is a storage room of nearly 110m² (1,184 sq ft)!
The footprint is rectangular, measuring 13.5m x 8.5m (44 ft x 28 ft)!
It will be used for storing vehicles and trailers, and it will be heated!
The existing structure will be demolished in the coming weeks, and the required area cleared. We have a high groundwater level; after digging 1.5m (5 ft), groundwater appears.
My current idea: I will excavate the entire area down to -70cm (-28 inches) level. The first 30cm (12 inches) will be filled with 0-63mm (0-2.5 inch) rolled gravel. On top, a finer, water-permeable layer with 0-32mm (0-1.25 inch) crushed stone will be applied. Then, I plan to lay a PE foil, and cover the entire area with 10cm (4 inches) XPS foam insulation boards. Above that, a 30cm (12 inches) thick concrete slab will be poured, which I will order as high-quality ready-mix concrete depending on your recommendations, possibly as a waterproof (WU) concrete slab if advised.
Here is the sketch:
I would appreciate your tips and experience regarding the slab under a storage hall / storage room!
On the slab, a vapor barrier using aluminum-laminated bitumen membrane will be installed against the wall; I plan to build the walls with 30cm (12 inches) concrete block formwork stone. The walls will be about 360cm (12 ft) high all around and insulated externally with 8cm (3 inches) rigid XPS foam boards. On top, there will be a foamed trapezoidal sheet metal roof weighing approximately 16kg/m² (3.3 lb/sq ft).
This is my current plan; the submission drawing has already been approved by the builder and is currently with the local authority for review before the building permit/planning permission hearing.
I need your experience regarding the floor construction!
Specifically, I am interested in the following:
Installation of underfloor heating – does the 120m² (1,292 sq ft) slab need to be equipped with expansion joints? If so, what are the requirements?
A 30cm (12 inches) concrete slab reinforced with double AQ50 steel mesh, or should I order fiber-reinforced concrete instead?
Is the floor assembly I proposed detailed enough, or is it undersized?
Thank you very much for your ideas,
best regards from Austria,
Robert
Hello
A 30cm (12 inch) concrete slab? That’s quite a substantial block.
The underfloor heating should usually be embedded in a screed. So: concrete slab, insulation, and then screed. And for 120m² (1292 ft²), definitely with expansion joints. The underfloor heating will probably need to have multiple circuits.
However, this is a project you should discuss with professionals. Here, you can only get non-binding ideas.
Steven
A 30cm (12 inch) concrete slab? That’s quite a substantial block.
The underfloor heating should usually be embedded in a screed. So: concrete slab, insulation, and then screed. And for 120m² (1292 ft²), definitely with expansion joints. The underfloor heating will probably need to have multiple circuits.
However, this is a project you should discuss with professionals. Here, you can only get non-binding ideas.
Steven
Okay, thank you very much for your input.
I will do some more research and talk to my builder. Several underfloor heating suppliers offer ready-made solutions that can be integrated into the concrete foundation slab. Let’s see what advice I receive.
Many thanks,
best regards,
Robert
I will do some more research and talk to my builder. Several underfloor heating suppliers offer ready-made solutions that can be integrated into the concrete foundation slab. Let’s see what advice I receive.
Many thanks,
best regards,
Robert
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