Hello everyone,
My partner and I are about to sign a contract for a plot of land with a developer. We specifically wanted a watertight concrete structure using waterproof concrete. However, we are having trouble understanding the construction specification. Could someone help us?
FOUNDATION SLAB
A reinforced concrete slab (thickness = 16cm (6.3 inches); steel reinforcement = 10kg/m2 (2.05 lbs/sq ft); concrete grade C25/30) will be constructed as the shallow foundation of the house and will include additional waterproofing against ground moisture according to DIN 18195-4. The flat-rate services from ACD also include a grounding strip made of galvanized steel band and a PE membrane laid as a cleanliness layer beneath the foundation slab. The foundation slab services in accordance with the building specification for the house are excluded.
INTERIOR AND EXTERIOR WALLS
The basement exterior walls exposed to air will be made from aerated concrete blocks, with wall thickness as specified in the drawings. The earth-contacting exterior walls will be constructed with concrete (thickness = 17.5cm (6.9 inches); steel reinforcement = 12kg/m2 (2.45 lbs/sq ft)) and insulated with 6cm (2.4 inches) of perimeter insulation (thermal conductivity class 040). Load-bearing and bracing interior walls will be constructed from aerated concrete blocks in the required thicknesses. Additional reinforcement for bracing the basement exterior walls may be required according to structural calculations. The clear height of the unfinished basement is 2.27 m (7.5 ft).
Waterproofing as specified in point 2
WATERPROOFING OF BASEMENT EXTERIOR WALLS
The exterior waterproofing of the basement walls protects against ground moisture. A drainage board or mat (e.g., Delta MS) safeguards the vertical moisture barrier during backfilling of the basement walls and ensures rapid drainage of water. This mat will be installed by the client as part of the backfilling work. All pipes passing through the basement exterior walls will be sealed. Basement window wells and a drainage system (e.g., drain pipes and flushing shafts) are not included. (Additional costs for waterproofing according to DIN 18533 class W2 or waterproof concrete guidelines may be necessary based on soil reports).
EARTH-CONTACTING EXTERIOR WALLS + EXTERIOR WALL INSULATION
The construction of the earth-contacting exterior walls follows point 1, using concrete. The perimeter insulation specified in point 1 is increased to 10cm (4 inches) (thermal conductivity class 040).
3. Additional waterproofing against hydrostatic pressure
The basement will be constructed with waterproofing against hydrostatic pressure (load case W2.1-E) as specified by the specialist planner. The waterproofing described in point 2 will be omitted.
My partner and I are about to sign a contract for a plot of land with a developer. We specifically wanted a watertight concrete structure using waterproof concrete. However, we are having trouble understanding the construction specification. Could someone help us?
FOUNDATION SLAB
A reinforced concrete slab (thickness = 16cm (6.3 inches); steel reinforcement = 10kg/m2 (2.05 lbs/sq ft); concrete grade C25/30) will be constructed as the shallow foundation of the house and will include additional waterproofing against ground moisture according to DIN 18195-4. The flat-rate services from ACD also include a grounding strip made of galvanized steel band and a PE membrane laid as a cleanliness layer beneath the foundation slab. The foundation slab services in accordance with the building specification for the house are excluded.
INTERIOR AND EXTERIOR WALLS
The basement exterior walls exposed to air will be made from aerated concrete blocks, with wall thickness as specified in the drawings. The earth-contacting exterior walls will be constructed with concrete (thickness = 17.5cm (6.9 inches); steel reinforcement = 12kg/m2 (2.45 lbs/sq ft)) and insulated with 6cm (2.4 inches) of perimeter insulation (thermal conductivity class 040). Load-bearing and bracing interior walls will be constructed from aerated concrete blocks in the required thicknesses. Additional reinforcement for bracing the basement exterior walls may be required according to structural calculations. The clear height of the unfinished basement is 2.27 m (7.5 ft).
Waterproofing as specified in point 2
WATERPROOFING OF BASEMENT EXTERIOR WALLS
The exterior waterproofing of the basement walls protects against ground moisture. A drainage board or mat (e.g., Delta MS) safeguards the vertical moisture barrier during backfilling of the basement walls and ensures rapid drainage of water. This mat will be installed by the client as part of the backfilling work. All pipes passing through the basement exterior walls will be sealed. Basement window wells and a drainage system (e.g., drain pipes and flushing shafts) are not included. (Additional costs for waterproofing according to DIN 18533 class W2 or waterproof concrete guidelines may be necessary based on soil reports).
EARTH-CONTACTING EXTERIOR WALLS + EXTERIOR WALL INSULATION
The construction of the earth-contacting exterior walls follows point 1, using concrete. The perimeter insulation specified in point 1 is increased to 10cm (4 inches) (thermal conductivity class 040).
3. Additional waterproofing against hydrostatic pressure
The basement will be constructed with waterproofing against hydrostatic pressure (load case W2.1-E) as specified by the specialist planner. The waterproofing described in point 2 will be omitted.
A concrete basement can be constructed to be waterproof. This requires the appropriate concrete mix, material thicknesses, sealing tapes, and so on.
A “white tank” is like a tissue paper. It is a type of waterproof basement built according to the WU (waterproof concrete) standard.
It is also possible to build a concrete basement that does not meet these criteria but is then additionally sealed (with a bituminous coating).
Since the construction specification, which apparently consists of standard text modules and later describes deviations from the standard, refers to 17.5 cm (7 inches) concrete thickness, I assume the sealing will be done with a bituminous coating.
A “white tank” is like a tissue paper. It is a type of waterproof basement built according to the WU (waterproof concrete) standard.
It is also possible to build a concrete basement that does not meet these criteria but is then additionally sealed (with a bituminous coating).
Since the construction specification, which apparently consists of standard text modules and later describes deviations from the standard, refers to 17.5 cm (7 inches) concrete thickness, I assume the sealing will be done with a bituminous coating.
Z
zaubermaus8424 Oct 2018 13:27Ok great, then my assumption was correct. We will insist that it is not built according to the WO guidelines.
zaubermaus84 schrieb:
What would be the correct description If you want a basement constructed as waterproof concrete (WW) according to the WU guideline, then it should be stated like that.
But why? Because of the tightness against pressurized groundwater?
Both options serve this purpose.
Lumpi_LE schrieb:
I think you misunderstood something. Typo: not "not" but "according to".
zaubermaus84 schrieb:
that it is built according to WU guidelinesZ
zaubermaus8424 Oct 2018 13:34Typo, of course I meant that we want to build according to WU guidelines.
Z
zaubermaus8424 Oct 2018 13:35We do not want this type of coating because it is widely reported that basement walls treated with it do not have good long-term durability.
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