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Flashcards in Moisture Protection Types Deck (13)
1

damproofing:

simple control of moisture,
not under hydrostatic pressure.

2

most typical use of damproofing

protection of slabs or foundations below grade, w continuous exposure to moisture.

3

damproofing used @ above grade concrete, masonry, wood walls

water repellent coatings

4

damproofing:
iron oxide

iron oxidizes and expands, limits shrinkage in material = tighter seal.

*may reduce strength.

5

damproofing:
bituminous coatings

asphalt/coal-tar pitch,
applied exterior side.
brushed/sprayed.
hot/cold.
applied to smooth surfaces.
*they do not seal cracks that develop after applied.

6

damproofing:
cementitious coatings

portland cement troweled over foundation wall,

used to smooth a rough wall,

standalone, or before another dampproofing is applied.

powdered iron often added, to expand + limit shrinkage.

7

damproofing:
membranes

built-up layers of hot/cold-applied asphalt felts,

membranes of butyl, polyvinyl chloride, and other synthetic materials.

*membranes mostly used @ hydrostatic pressure, bc $ and skilled application.

8

damproofing:
plastics

silicone and polyurethane,
but typ above grade.

9

hydrostatic pressure:
1st steps before application of waterproofing

slope away from bldg,
perimeter drainage,
relieve excessive pressure.

10

waterproofing:
built up layers of...

bituminous saturate flets (sim roofing)

11

waterproofing:
single-ply synthetic membranes

butyl, polyvinyl chloride

*subject to puncture damage during backfill,

so typ protective surface overlaid prior.

12

waterproofing:
waterstops

dumbbell-shaped, continuous rubber or neoprene extrusions.

50/50 first pour /second pour.

13

waterproofing:
bentonite panels

flat packages bentonite clay in kraft paper packages.

placed under slabs/against walls.

after fill, paper deteriorates, clay expands in moisture = barrier.