Basement-Waterproofing-System.pptx

1. WATERPROOFING FOR BASEMENT
How this Happen?
1. Waterproofing is needed in cases where ground water is
attempting to reach a level while it moves downward towards the
watertable.
2. This leveling causes hydrostatic pressure to be exerted onto
basement walls.
3. This hydrostatic pressure forces water into foundation walls and
through the footing-foundation wall joint.
4. Hydrostatic pressure can cause major structural damage to
foundation walls and has the ability to mold and decay building
materials.
Definition:
Basement waterproofing refers to preventing water from entering
the basement of a building.

2. WATERPROOFING FOR BASEMENT
TANKING OR MEMBRANE SYSTEM
• The objective of tanking is to provide a continuous waterproof
membrane.
• Tanking is applied all around floor & wall – in the form of liquid
application, laying of pieces and/or sheets
• The tanking can be applied externally and internally according
to the circumstances prevailing on site.
• Alternative to mastic asphalt are polythene sheeting, bituminous
compounds, epoxy resin compound and bitumen laminates

3. WATERPROOFING FOR BASEMENT

4. WATERPROOFING FOR BASEMENT

5. WATERPROOFING FOR BASEMENT
CONCRETE ADMIXTURE OR INTEGRAL SYSTEM
• Provides protection against water penetration based on the use
of admixtures with waterproofing properties in the concrete
mix
• Function of admixtures:
a) To form concrete with surfaces that are repellent (resistant) to
water
b) To fill the capillary pores hence reduces the permeability of the
concrete.
• Common admixtures used are the reactive hydrophobic pre-
blocking ingredient and silica fume.

6. WATERPROOFING FOR BASEMENT
DRAINAGE CAVITY SYSTEM
• Water seepage or moisture penetration is allowed to be
collected & drained away
• This system achieved by constructing an inner non-load
bearing wall to create a cavity wall & special precast concrete
drainage tiles over the basement floor but below the actual floor
tile finishes, screeds & DPM
• Water will trickle (mengalir) down the inside face of the outer
wall, flow beneath the floor tiles, discharge into the surface of
water drains or pumped into the drain

7. WATERPROOFING FOR BASEMENT