It's a waterproof membrane, they seem to be being used more these days and this explains.So, what is that green stuff for? I haven't seen that before.
I had no idea about this. That's yet another reason why I wouldn't ever live at that development; if Pemberton is too cheap to excavate all the contamination than i'd want no business in living in their cheap build.Time and Space condos on Front is built on a contaminated site and the developer decided it was too expensive to excavate it all out so they spent months installing a membrane. Not sure if this one is for contamination or water but ....
I did not say that this site is contaminated and here it may 'just' be for water infiltration but at many sites (and Time & Space is one) it serves two purposes. keeping water and 'contamination' out.You are potentially reading too much into this. It could be that, but it could be not.
They even put down barriers in low-rise basements before they pour the slab.
It serves as both a moisture barrier and to prevent radon infiltration.