The key to Figure 7 is that there must be an interior perimeter drain
and a granular capillary break along the vertical portion--as well as the horizontal portion--of the stone wool and mineral wool layer.
In an ideal situation, foundation would stay exposed with an impermeable membrane guarding the foundation underground guiding water to a perimeter drain
system, which sends the water to the sump pit.
Two more questions: In installing any exterior perimeter drain
, must I dig all the way down to the bottom of the foundation wall?
Seventeen houses in our study had both a perimeter drain
and a sump pit (mean radon concentration = 5.2 pCi/L), eight of which had a radon concentration [greater than or equal to] 4.0 pCi/L.
You will need to channel the water down the walls and into a perimeter drain
Some companies utilize a perimeter drain
with no piping.
The caddy has ventilated side panels and perimeter drain
holes for quick drying of contents.
Krevosky said he chose the location for his trout incubator because of an upwelling of groundwater from the perimeter drain
of a nearby home.
Next came the interior perimeter drain
(Photo 4, see Page 73).
"The geotextile fabric," Leighton said, "keeps uncontaminated cove/material (soil on top of the impermeable cap) from clogging the extruded screen material which acts like a gigantic perimeter drain
." An 84-inch cushioning layer of stone dust was placed on top of the geonet to protect it from damage.
Co-owner Gerald Paulauskas said a perimeter drain
has been installed to help drain the 8th green and more drainage work will be performed on the 4th fairway this season.