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.
Z
zaubermaus8424 Oct 2018 11:39The house will otherwise be built using Poroto T9.
Spunk schrieb:
doch, WW schon ... There is a waterproofing guideline that includes parameters defining a "white tank" (watertight concrete structure). What is described here has nothing to do with that.
Z
zaubermaus8424 Oct 2018 11:58However, the sealing mentioned in point two is also omitted.
Z
zaubermaus8424 Oct 2018 12:03Waterproofing according to point 2
WATERPROOFING OF EXTERIOR BASEMENT WALLS
The exterior waterproofing of basement walls is designed to protect against ground moisture. A drainage board or mat (e.g., Delta MS) protects the vertical moisture barrier during backfilling of the basement walls and ensures quick water drainage. This mat is installed by the client as part of the backfilling work.
All pipes passing through the basement exterior walls are sealed. Basement window wells and a drainage system (e.g., drain pipe and flushing shafts) are not included. (Additional work for waterproofing according to DIN 18533 class W2 or the watertight construction guideline may be required based on soil report specifications.)
Alternatively, constructing a basement with waterproofing against pressurized water eliminates the need for waterproofing according to point 2.
WATERPROOFING OF EXTERIOR BASEMENT WALLS
The exterior waterproofing of basement walls is designed to protect against ground moisture. A drainage board or mat (e.g., Delta MS) protects the vertical moisture barrier during backfilling of the basement walls and ensures quick water drainage. This mat is installed by the client as part of the backfilling work.
All pipes passing through the basement exterior walls are sealed. Basement window wells and a drainage system (e.g., drain pipe and flushing shafts) are not included. (Additional work for waterproofing according to DIN 18533 class W2 or the watertight construction guideline may be required based on soil report specifications.)
Alternatively, constructing a basement with waterproofing against pressurized water eliminates the need for waterproofing according to point 2.
Lumpi_LE schrieb:
There is a WU guideline that includes parameters defining a “white tank” (watertight concrete structure). What is described here has nothing to do with that. Since November 2003, the requirements for watertight concrete structures (white tanks) in Germany have been regulated by the guideline Watertight Concrete Structures issued by the German Committee for Reinforced Concrete.
Ok, you are right. That is not described here.
Sometimes the term WW is used simply to mean waterproofing against groundwater pressure. This is obviously incorrect and probably just as hard to dislodge from people’s minds as the term “EC card”. But under point 2 there is also this:
zaubermaus84 schrieb:
(Additional waterproofing effort according to DIN 18533 class W2 or WU guideline may be required due to specifications from the soil report). @zaubermaus84
These are text modules, something like:
Point 2. Protection against ground moisture
Point 3: Construction of the basement with waterproofing against pressurized water (load case W2.1-E), plus point 1. on 10cm (WLG 040) (10cm (4 inches) thermal insulation), with omission of waterproofing against ground moisture (according to point 2), otherwise there would be double waterproofing.
Overall, this is poorly written... you can read whatever you want into it.
It looks like the builder wants to keep options open on how to perform the waterproofing in the end. Whether by:
- Waterproofing according to DIN 18533 class W2, or
- WU guideline
A white tank according to the WU guideline is just a special case of how the requirements (of DIN 18533) can be fulfilled, for which the DIN does not apply, but the WU guideline does. ;-)
In the end, it results in waterproofing against pressurized groundwater. See @Mottenhausen—tight is tight.
Z
zaubermaus8424 Oct 2018 12:58What would be a better or more accurate description? Is this reinforced concrete? Sorry for the basic questions, I just don’t understand it. At my parents’ house, the basement was poured with steel reinforcement. They didn’t have any additional waterproofing.
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