Flashcards in Moisture Protection Types Deck (13)
simple control of moisture,
not under hydrostatic pressure.
most typical use of damproofing
protection of slabs or foundations below grade, w continuous exposure to moisture.
damproofing used @ above grade concrete, masonry, wood walls
water repellent coatings
iron oxidizes and expands, limits shrinkage in material = tighter seal.
*may reduce strength.
applied exterior side.
applied to smooth surfaces.
*they do not seal cracks that develop after applied.
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.
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.
silicone and polyurethane,
but typ above grade.
1st steps before application of waterproofing
slope away from bldg,
relieve excessive pressure.
built up layers of...
bituminous saturate flets (sim roofing)
single-ply synthetic membranes
butyl, polyvinyl chloride
*subject to puncture damage during backfill,
so typ protective surface overlaid prior.
dumbbell-shaped, continuous rubber or neoprene extrusions.
50/50 first pour /second pour.