03-26-2019, 11:38 AM
(03-26-2019, 09:17 AM)megabytephreak Wrote:(03-26-2019, 08:38 AM)jgsz Wrote: Does anyone know what the material is on the side of the walls? First they put on what looks like a black sheet and then a white sheet over that. Is it some kind of insulation?
Probably some sort of waterproofing. First a drainage layer to let the water flow to the bottom, than a barrier layer to protect the concrete that will eventually be poured between a form and the wood.
If the black layer is what I’ve seen elsewhere, it’s a fairly thick and stiff plastic layer formed into a grid of bumps. The result is a mostly-empty space between the blank and white layers down which a certain amount of water can flow, probably to be collected and pumped away by a dewatering system. I was able to observe this being constructed when the QNC building was built at UW.