Video Case Study

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This is in reference to below ground basements this is a fairly new construction a couple of years old it’s been done the conventional situation where it’s a wet basement designed as a wet basement with shotcrete walls so it’s pier and beam dug down excavated out and then shotcreted afterwards to create your wall surface. The first slide shows the water migrating out from underneath the ramp down into the car park from street level and the material the water actually coming out from the underneath the ramp and the ground slab.

Then we have the pier and beam set up at the top so this is the capping beam at the top where it’s allowing water to actually migrate in from the capping beam and down the face of the shotcrete wall and that one in particular shows that it’s quite dangerous actually because it’s getting to the exit sign and also a lot of the copper piping. Now with groundwater there’s an immense amount of salts involved in a lot of the cases these salts are highly destructive particularly to copper pipes and galvanized and zinc alum fittings and they deteriorate very very rapidly and cause immense rust so that’s another issue that needs to be dealt with.

The cracking in the basement is extensive in this particular case and it’s weeping everywhere we’ve got a number of different shots here showing the cracks depending on which side of the of the job it’s on some of it has a lot of muddy groundwater that’s flowing into it from behind other ones are clear water flowing in so it’s different circumstances what’s happening on the outside and above which is creating some of that the difference I suppose.

The method we use to rectify this or to go about it is to drill into the or near the cracks and inject at high pressure a special resin which reacts with the water when it reacts with the water it foams up and expands to perhaps ten times its size. Some of these shots show the foaming reaction taking place which is actually a good reaction this is what we’re looking for we want it to do this it foams and basically bubbles out sealing the crack as it as it comes out but we try to get in behind the shotcrete wall and seal the water from coming in that crack from behind.

We also have an alternative methods that we can offer to prevent this from happening right from the word go so we actually spray in behind the shotcrete wall with their product called liquid rubber this creates a blanket membrane behind it it still directs the water to the bottom and it’s still a wet basement but what it does do is stop all this destruction of the shotcrete walls cracking and leaching and causing all this problem.

In this particular case the residences were quite upset about it because every time they stepped out of their car they were in muddy water and rubbish everywhere. It became an OH&S problem people were slipping over and falling over and then they had to do something about it and that’s where we got involved. So that’s all for now if you care to find out more information or you want a quote for doing this type of work or preventative measures please contact me from the details at the end of this video or go into the website and have a bit of a browse around there for more further information.

Findlay-Evans Waterproofing

A Waterproofing Company That Thinks Construction

Registered Building Practitioner & Certified Waterproofers

P: (03) 8812 2918



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