Treating Crawl Spaces and Other Earthen Areas
1.
The following is a description of a crawl space that has been sealed. 4 mil polyethylene was used to cover a large crawl floor, seams caulked and overlapped 6 inches and taped. Posts and pipe penetrations edges were sealed with foam. Poly was secured tight to a smooth foundation wall with 1x3 furring, no sealant was used along walls and membrane due to the tight fit. Cracks in the crawl space walls were caulked and a 3" perforated drain tile was laid under the membrane to facilitate the installation of a sub-membrane suction at a later date.
Which of the following statements depict the correct violations that have occurred?
Perforated drain tile can not be used. Wall/membrane joint not sealed.
Wall/membrane joint not sealed. Polyethylene thickness wrong. Seams not overlapped properly.
Foam can’t be used as a sealant. Polyethylene is not a proper sub-membrane.
The system would meet Illinois mitigation standards but not EPA standards.
2.
After sealing a crawlspace you conduct a smoke test on a small hole in the membrane. When you first start the test air is being drawn into the hole, you notice that the direction changes and air starts to blow out of the hole. No suction system was installed.
What would be the most likely cause?
Defective non-thermal smoke.
Plastic is settling.
Wind direction outside.
Water under membrane.
3.
In a combination sub-membrane, sub-slab and blockwall depressurization system. You should expect which of the following thing to occur?
Low air flow.
High air flow.
Backdrafting of combustible appliances.
Both B and C.
4.
Why would you want to adjust air flow using dampers in multiple suction point systems?
Reduce air flow noise.
Prevent condensation.
Increase suction to other suction points.
None of the above.
5.
If you run into a home with multiple crawlspaces due to additions, you should?
Treat each area as a separate crawl space.
Seal all crawl spaces. Installing a suction point in one should take care of all.
Bid the job high and hope a competitor gets it.
Seal crawl off from living areas and apply suction to crawl space.
6.
Applying a suction system to an existing Baseboard De-watering system can cause which of the following things to happen that were not mentioned in the review material?
Gurgling noises during rain.
Can void manufacturers or installers warranties.
This is not a fair question it wasn't in the review material.
Both A. and B.
7.
When installing any suction system, which of the following is most important?
Time required to install system.
Who will be paying the bill.
The size of the pipe.
The ability to add additional suction points if needed.