Hello and good day everyone!
I am planning to build on a sloped plot. I have the construction description in front of me, but it raises some questions.
The house footprint is 7.2m x 9m (24 ft x 30 ft), with presumably half of the basement below ground level.
Next to the house, there is also a garage (4m x 6m (13 ft x 20 ft)) with a basement.
1. Concrete Slab
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Excerpt from the construction description:
Shell construction - foundation of the basement.
The foundations will be excavated according to structural requirements, backfilled with concrete of grade C16/20, and founded at a frost-free depth of 1 m (3 ft). If a load-bearing soil layer is not reached at the 1 m (3 ft) foundation depth, any additional excavation and foundation concrete volume must be compensated beyond the delivery note proof.
A filter layer made of gravel will be installed against capillary moisture. The concrete slab will be executed with concrete grade C20/25 and reinforced with steel mesh. The slab thickness depends on structural calculations and is usually 15 cm (6 inches).
Foundation earth electrode...............
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1st question
Is the concrete grade C20/25 suitable for the slab, or should one consider using waterproof (WU) concrete or special sealing concrete?
The basement is intended to house a laundry room, fitness area, and a proper living room. Underfloor heating is planned for all rooms.
2nd question
Since there is no mention of insulation in the slab description, is there something missing here?
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2. Basement Walls
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Excerpt from the construction description:
The basement exterior walls on the uphill side will be constructed of 24 cm (9.5 inches) thick concrete walls with 6 cm (2.5 inches) insulation, designed according to structural requirements. On the downhill side, energy-efficient Poroton bricks T10 with a 12 cm (5 inches) external thermal insulation composite system will be used.
The internal partition walls...................
Between the slab and basement walls, a waterproofing layer against rising moisture will be installed. The basement walls in contact with the earth will receive a durable bituminous thick coating and a dimpled membrane laminated with a filter fleece in this area.
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This should achieve a U-value of 0.15 W/m²K.
-----
3rd question
Is this approach acceptable, or would it be better to use waterproof (WU) concrete here?
Does the described wall construction save significant costs compared to WU concrete?
Thank you in advance for your answers.
Have a nice day!
anton
I am planning to build on a sloped plot. I have the construction description in front of me, but it raises some questions.
The house footprint is 7.2m x 9m (24 ft x 30 ft), with presumably half of the basement below ground level.
Next to the house, there is also a garage (4m x 6m (13 ft x 20 ft)) with a basement.
1. Concrete Slab
-----
Excerpt from the construction description:
Shell construction - foundation of the basement.
The foundations will be excavated according to structural requirements, backfilled with concrete of grade C16/20, and founded at a frost-free depth of 1 m (3 ft). If a load-bearing soil layer is not reached at the 1 m (3 ft) foundation depth, any additional excavation and foundation concrete volume must be compensated beyond the delivery note proof.
A filter layer made of gravel will be installed against capillary moisture. The concrete slab will be executed with concrete grade C20/25 and reinforced with steel mesh. The slab thickness depends on structural calculations and is usually 15 cm (6 inches).
Foundation earth electrode...............
-----
1st question
Is the concrete grade C20/25 suitable for the slab, or should one consider using waterproof (WU) concrete or special sealing concrete?
The basement is intended to house a laundry room, fitness area, and a proper living room. Underfloor heating is planned for all rooms.
2nd question
Since there is no mention of insulation in the slab description, is there something missing here?
------------------------
2. Basement Walls
-----
Excerpt from the construction description:
The basement exterior walls on the uphill side will be constructed of 24 cm (9.5 inches) thick concrete walls with 6 cm (2.5 inches) insulation, designed according to structural requirements. On the downhill side, energy-efficient Poroton bricks T10 with a 12 cm (5 inches) external thermal insulation composite system will be used.
The internal partition walls...................
Between the slab and basement walls, a waterproofing layer against rising moisture will be installed. The basement walls in contact with the earth will receive a durable bituminous thick coating and a dimpled membrane laminated with a filter fleece in this area.
-----
This should achieve a U-value of 0.15 W/m²K.
-----
3rd question
Is this approach acceptable, or would it be better to use waterproof (WU) concrete here?
Does the described wall construction save significant costs compared to WU concrete?
Thank you in advance for your answers.
Have a nice day!
anton
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