Waterproofing the Cold Joints

We don’t want water in our house.  Any water.

Belt and Braces

If, somehow, water gets past the Preprufe membrane, it needs to get through 10 inches of concrete.  Since we poured a concrete slab and then put in shotcrete vertical retaining walls, there will be a ‘cold joint’ where the concrete slab meets the vertical retaining walls.  Cold joints represent weaker areas where it is easier for water to penetrate.

To add additional protection in the cold joint, Bill Brown recommended (ok, he specified) that we use SuperStop in the cold joint.  SuperStop is a bentonite strip that goes inside the joint in the concrete slab and if any water penetrates the cold joint then the bentonite will expand and seal the leak.

SuperStop packaging (130 linear ft, showing 'Safety First' and 'Made in the U.S.A.'

SuperStop packaging (10 13 ft rolls, or 130 linear ft), showing 'Safety First' and 'Made in the U.S.A.'

SuperStop in the cold joint in the concrete slab.

SuperStop in the cold joint in the concrete slab.

SuperStop in the cold joint.

SuperStop in the cold joint.

Hold Downs for Steel Beams

There are eight ‘pockets’ in the vertical retaining walls that are under where the hollow core concrete panels will rest.  These pockets need to be formed in the walls and have hold downs embedded in the concrete.  The steel beams will either be welded to 1/2 inch steel plates, which are bolted to the hold downs or nuts will be screwed down to the hold downs going through the flanges of the steel beam. 

It is critical that the hold downs be in the correct locations and the pockets are at the correct elevation in the vertical concrete walls.

Hold down that will be embedded in the vertical concrete wall.

Hold down that will be embedded in the vertical concrete wall.

Two layers of rebar in the vertical concrete retaining wall between the external stair well and the lower level.  Since the face of the concrete wall will be seen externally, the plywood forms will be inside the structure and the shotcrete will be done on the external face.

Two layers of rebar in the vertical concrete retaining wall between the external stair well and the lower level. Since the face of the concrete wall will be seen externally, the plywood forms will be inside the structure and the shotcrete will be done on the external face.

Vertical wall inside the pantry, which will be shotcreted on Wednesday.  This wall will be insulated from the other side, which will be an exposed feature concrete wall rising 20 ft up from the finished floor of the lower level.

Vertical wall inside the pantry, which will be shotcreted on Wednesday. This wall will be insulated from the other side, which will be an exposed feature concrete wall rising 20 ft up from the finished floor of the lower level.

Cedar Shakes from British Columbia

The shake samples arrived so Bryan took a photo of the shakes enjoying the California sunshine.  More on these later …

Cedar shake samples from Fanny Bay, British Columbia.  Left to right are tapersawn Yellow Cedar, tapersawn Red Cedar, and handsplit Red Cedar.

Cedar shake samples from Fanny Bay, British Columbia. Left to right are tapersawn Yellow Cedar, tapersawn Red Cedar, and handsplit Red Cedar.

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