ᐅ The builder wants to apply a bitumen coating to the fully plastered base of the building?
Created on: 2 Feb 2018 21:47
3
305er
Hi, we are about to receive the house handover soon. Recently, the site manager casually mentioned that we need to apply a bitumen layer on our foundation wall, which is already plastered. This layer should be applied up to the height where the soil will be backfilled.
Another site manager said it should only be applied up to the perimeter insulation.
Since the workers are rarely around and, when they are, they are very brief, we haven’t received a clear explanation on how far we actually need to apply the coating.
Under the foundation plaster, there is pink polystyrene insulation, which was glued on with bitumen (without any sticky, unpleasant black substance).
Do we really have to apply another bitumen coating on top? Or would an insulation coating based on bitumen be sufficient? Or should we use a flexible waterproofing slurry instead?
Everyone says something different -.-
There are so many types of bitumen products. No idea which one is the right choice.
Attached is a screenshot from the contract regarding waterproofing.
I also don’t see anywhere else that anything else needs to be done by the builder.
Here you can see a part of the foundation wall.
Another site manager said it should only be applied up to the perimeter insulation.
Since the workers are rarely around and, when they are, they are very brief, we haven’t received a clear explanation on how far we actually need to apply the coating.
Under the foundation plaster, there is pink polystyrene insulation, which was glued on with bitumen (without any sticky, unpleasant black substance).
Do we really have to apply another bitumen coating on top? Or would an insulation coating based on bitumen be sufficient? Or should we use a flexible waterproofing slurry instead?
Everyone says something different -.-
There are so many types of bitumen products. No idea which one is the right choice.
Attached is a screenshot from the contract regarding waterproofing.
I also don’t see anywhere else that anything else needs to be done by the builder.
Here you can see a part of the foundation wall.
H
hemali20033 Feb 2018 21:16Ok, then it may be necessary to ensure proper drainage of the splash guard strip. Otherwise, water could collect there later and damage the base plaster.
The remaining space will be filled with topsoil.
No drainage system is actually planned. According to the groundworker, the soil is very permeable to water.
So what type of bitumen do I need now?
And if you leave 20–30cm (8–12 inches) of space near the base? Should this area just be filled with sand and gravel or something similar on top?
No drainage system is actually planned. According to the groundworker, the soil is very permeable to water.
So what type of bitumen do I need now?
And if you leave 20–30cm (8–12 inches) of space near the base? Should this area just be filled with sand and gravel or something similar on top?
H
hemali20033 Feb 2018 22:04This is how I would do it, or how we did it:
Apply a bitumen waterproofing membrane up to the ground level.
Place a dimpled membrane in front of it.
For the splash guard strip (which is definitely necessary, otherwise the plaster will be completely dirty after a few months):
Concrete in curb stones 30-50cm (12-20 inches) away from the wall (without a border, grass and gravel will eventually mix).
If necessary, install drainage if the soil is not permeable.
Backfill with gravel or crushed stone.
Apply a bitumen waterproofing membrane up to the ground level.
Place a dimpled membrane in front of it.
For the splash guard strip (which is definitely necessary, otherwise the plaster will be completely dirty after a few months):
Concrete in curb stones 30-50cm (12-20 inches) away from the wall (without a border, grass and gravel will eventually mix).
If necessary, install drainage if the soil is not permeable.
Backfill with gravel or crushed stone.
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