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Step
One
Excavate around the basement
down to foundation level
This is best done during construction phase when no excavation is
needed
Step
two
Apply generous amounts
of Bitumen Primer by means of block brush or roller to all the areas
that will receive the torch on membrane
Step
three
Heat fuse the torch on
membrane to the primed areas.
Torching is quite tricky and should only really be done by persons
who have experience in this.
Diagram?
Step
four
Connect the pieces of
flow pipe and wrap in bidum cloth
Flow pipe is a pipe with holes in it.
The pipe allows water to pass into it and flow away to a storm water
outlet.
Bidum cloth is a geo textile that act likes a filter to stop sand
and other objects entering the pipe
Tip:
It is important to get the levels of the flow pipe falling correctly.
It would be best to consult a drainage expert on this. Some council
regulations demand that plans be approved for drainage systems
Step
five
Surround the flow pipe with 19mm builder stone
The stone acts as the first filter
Step
six
Back fill with clean sand
How
to waterproof the inside of a basement using a cement based waterproofing
product / Prostruct 526
Where one cannot tank
the outside (called the 'positive side') of the walls and the problem
can only be addressed from the inside (called the 'negative side')
of the basement. This is a compromise solution and may never really
solve the problem of poor design or construction…it is a last
resort in what may be a desperate situation and it cannot be fully
guaranteed by the contractor.
Prostruct 526 is cement
based waterproofing product that can hold back moisture and small
amounts of water from the inside of a structure. The product is
either applied by block brush or by 3mm trowel application.
It is important to note:
> This solution is not recommended
unless there is no way of waterproofing the outside of the basement
walls
> A cement based waterproofing
product will crack if the there is movement in the structure.
> This may cause the waterproofing
system to fail.
Step
one - surface preparation
Remove all excess water
by means of water pump
Remove by mechanical means any previous waterproofing product
Important
The bare cement needs to be exposed
Use a dust mask
If you use a grinding machine, check the inside of the house after
one hour of grinding - fine dust particles may be sucked out of
the basement into the main house area and settle there. This will
cause a huge mess.
Step
two - plugging
Identify obvious ingress
areas being small springs of water
Use a core drilling machine ( Hire from local hire company ) and
drill a 40mm hole into the concrete until soft substrate is reached
Plug the hole using Vandex plug - The instructions are very easy
to follow and should be followed exactly.
Step
three - Prostruct 526 Application
Depending on how serious
the problem is, decide whether you will block brush the product
( usually two coats will do it ) or trowel the product.
Our client had most of
the water coming from the floor and some heavy moisture coming from
the walls
Tip: The product sets VERY quickly…within
30min an entire kit will set harder than concrete so only mix enough
that can be used in one application.
Follow the instructions to mix on the product
Start on the walls first
Use a block brush to apply a layer in vertical stripes.
Move to the floor area
next - We used a trowel to apply a 3mm layer of the product to the
floor.
Tip:
Smooth off the edges of the trowel work using a wet trowel. This
will make applying the next layer of product to a smooth edge and
will be better for bonding.
Apply a second coat to the wall area
The finish of the block
brush is quite rough and if painted over will have an unusual texture.
Tip:
A smooth finish can be achieved by applying a layer of Crete-stone
over the 526. A plasterer may have difficulty plastering the walls
coated in 526 with normal cement. This is because cement mortar
draws moisture from the walls as part of the chemical process it
uses to cure. Since the 526 now blocks the moisture in the walls,
the cement has a hard time 'sticking' to the wall during application.
The problem is overcome using Crete-stone.
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