Moisture Protection Types

Question 1

damproofing:

Answer 1

simple control of moisture,

not under hydrostatic pressure.

Question 2

most typical use of damproofing

Answer 2

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

Question 3

damproofing used @ above grade concrete, masonry, wood walls

Answer 3

water repellent coatings

Question 4

damproofing:

iron oxide

Answer 4

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

*may reduce strength.

Question 5

damproofing:

bituminous coatings

Answer 5

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

Question 6

damproofing:

cementitious coatings

Answer 6

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.

Question 7

damproofing:

membranes

Answer 7

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.

Question 8

damproofing:

plastics

Answer 8

silicone and polyurethane,

but typ above grade.

Question 9

hydrostatic pressure:

1st steps before application of waterproofing

Answer 9

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

Question 10

waterproofing:

built up layers of…

Answer 10

bituminous saturate flets (sim roofing)

Question 11

waterproofing:

single-ply synthetic membranes

Answer 11

butyl, polyvinyl chloride

*subject to puncture damage during backfill,

so typ protective surface overlaid prior.

Question 12

waterproofing:

waterstops

Answer 12

dumbbell-shaped, continuous rubber or neoprene extrusions.

50/50 first pour /second pour.

Question 13

waterproofing:

bentonite panels

Answer 13

flat packages bentonite clay in kraft paper packages.

placed under slabs/against walls.

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