Sump and Drain Tile Depressurization
1.
Suction points in sump lids
are never allowed.
can be installed as a secondary suction point.
are permitted with an approved variance request.
Both B and C.
2.
When installing a sub-slab suction system into the floor you discover an interior drain tile, what is most likely to occur if you install the system and do not seal the sump?
The system may not work.
Heating and cooling cost will rise.
The system will have large air flow volume.
All the above.
3.
Soakaways to daylight can cause what to occur with drain tile suction?
A short circuit in air flow, reducing performance.
Water to gather at the suction point.
Soakaways to daylight have no effect on the systems due to the distance from the suction point.
Both A and B.
4.
Applying suction to the sump as a secondary suction point requires?
Approved deviation request from IDNS.
A Submersible sump pump.
The use of high suction, low volume fans.
Sump pits with few opening through the side wall of the pit.
5.
r=Blue>You installed a drain tile depressurization system in a home with a full basement, the home has interior and exterior drain tiles, several windows below grade and two sump pits, your u-tube is showing high air flow. Post mitigation tests indicated radon levels were still above 4 pCi/l.
Which is most likely to have happened?
High water table blocking air flow.
Window well is allowing to much air into system.
Sump is allowing water to rise over drain tile.
Pipe size is restricting air flow.
6.
The home you just installed a SSD system into has a full finished basement. The sub-slab material was 4 inches of clean pea-gravel. Inspection of the sump indicated it was dry and exterior drain tiles only. The U-tube installed is indicating little to no air flow. You drill a test hole in a closet on the opposite side of the basement from the suction point, the test hole shows very good communication.
What might be causing the low air flow?
There is a large cold joint or cracks hidden behind the walls or floor.
The ground below the sub-slab material is packed tight. Little to no cracks exists in the slab.
High water tables could be blocking air flow, interior drain tiles should be installed.
7.
Using the information from Review Question #6.
Post mitigation test results showed the radon levels increased after installation of the SSD. What is the most likely source of radon entry?
Walls or plumbing penetrations in the walls.
Floor or plumbing penetrations in the floor.
Homeowner tampering.
Building materials.