We continued to observe the construction activities of the basement in Menlo Park.

After completing the excavation, they are now working on the waterproofing before the slab is poured.  The white material is ParaSeal, a membrane backed with bentonite.

Overview of the waterproofing.

The stairs going down look like a ‘leading practice’ that could be used on our site.

Waterproofing underway.

Here is a closeup of the detail around the penetrations in the membrane.

Detailing around penetrations of the ParaSeal membrane.