External wall below ground

Influences on the building envelope

Protection against splashing water

Topsoll, 25-30 cm

Protection against splashing water

Topsoll, 25-30 cm

Damp-roof membrane (dpm) to protect against water from the soil (unheated basement)

a) normal level of moisture: black paint (bituminous compound, 2-3 mm)

b) higher level of moisture: a) + waterproof concrete (chemical additive)

c) groundwater: e.g. multi-layer bituminous roofing felt (fully bonded)

Grass

Damp-roof membrane (dpm) to protect against water from the soil (unheated basement)

a) normal level of moisture: black paint (bituminous compound, 2-3 mm)

b) higher level of moisture: a) + waterproof concrete (chemical additive)

c) groundwater: e.g. multi-layer bituminous roofing felt (fully bonded)

Filter layer (unnecessary in groundwater; at best as mechanical protection for damp-proof membrane)

a) filter boards: e.g. concrete with expanded clay aggregate, or polystyrene, d = 4-5 cm b) filter mat: plastic film with honeycomb\structure, d = 2-3 cm c) perimeter insulation with drainage function

Geotext Pebble Sloping

Perfora fall appr Lean concrete

(blinding layer, e.g. to help place reinforcement), d = 5-10 cm

Drainage, perforated/porous pipe for draining surface water

Depends on geographical location of structure:

- subsoil properties, slope of terrain (slope run-off water), proximity of natural surface waters, groundwater subsoil, backfilling (drainage capacity of ground):

- gravel, sand, soil, rock, etc. statutory provisions:

- directives for protecting natural surface waters, cantonal, local provisions

- building zone structural conditions:

- earth pressure, hydrostatic pressure

All the above factors must be considered when deciding whether or in which form it is necessary to drain away water seeping below ground. It may be possible to omit the damp-proof membrane and the filter layer.

Fig. 70: External wall, scale 1:20

Grass

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