Radon mitigation techniques

Sub slab depressurization (SSD) – Most homes will be fixed with a “Sub slab depressurization” system, which uses a fan and PVC pipe to draw air from below the basement floor and exhausts it above the roof. What is the recommended humidity in a house The radon fan creates a vacuum under the basement floor. What is the recommended humidity level for a home With the fan running, if you puff smoke by a crack or opening in the basement floor, you will see the smoke slowly pulled down through the crack or opening.


What is the recommended humidity level for a house Turn the fan off, and the smoke will blow back in your face. What is the recommended humidity level in a house As long as the fan is running, there is literally no underground air entering the home. What is the right humidity level in a house Typically, the pipe will run through the garage, and the fan will be in the garage attic. What is the right indoor humidity level Other methods consist of the pipe in a closet and the fan in the attic, or both the pipe and fan outside.

SSD with a crawl space – In a home with exposed dirt in a crawl space, the dirt will normally be covered with a special plastic designed for crawl spaces. What is the right level of humidity in a house The plastic will be sealed to the perimeter walls. What level of humidity should be in a house Then, a tee will be put in the pipe of the SSD system, and an arm of the pipe will be run into the crawl space and down through the plastic. What should be humidity level in house Now, as the fan runs, it draws air from under the basement floor and from under the plastic.

Sealing openings – Years ago, the EPA experimented with various radon mitigation techniques. What should be the humidity level in your house To assess the effect of sealing, they sealed basement walls, floors, and ceilings with epoxy, made the return air ductwork airtight, put an airtight door at the top of the stairs, installed sealed combustion furnaces and water heaters and more. What should be the normal humidity in a house After spending $4,000 to $5,000 per home, they got radon reductions ranging from 0 to 50%. What should humidity level be in a house For this reason, the EPA does not consider sealing to be a primary mitigation technique. What should humidity level be in home Our experience has been similar. What should humidity level be in house We have sealed 1,500 square foot crawl spaces and seen no change in the radon level. What should humidity level be in house in winter In 50% of the homes we have sealed, the radon level went up slightly, in 50% it went down slightly. What should indoor humidity level be in summer A small number of homes will have a significant decrease or increase in the radon level after sealing. What should the humidity be in my house canada To maximize the performance of an SSD system, sump holes and large cracks near the suction point will generally be sealed.

Air exchangers – A small minority of homes have extensive additions, unusual conditions under the floor or large inaccessible crawl spaces. What should the humidity be in my house during summer These homes can be hard to fix with an SSD system, and are sometimes fixed using an air exchanger (also known as an air to air heat exchanger or heat recovery ventilator). What should the humidity be in my house uk A typical air exchanger has two fans, one blowing air into the house and one blowing air out of the house. What should the humidity level be in a home 60% to 80% of the heat in the exhaust air is recovered and returned to the house. What should the humidity level be in a house The air exchanger doesn’t prevent radon from entering; it simply dilutes it with outside air. What should the humidity level be in my home A typical home may change air naturally every two hours and have a radon level of 6 pCi/L. What should the humidity level be in my house To cut the radon level in half, a contractor will install an air exchanger large enough to double the rate at which the house changes air. What should the humidity level be in your house So now the house will change its entire volume of air every hour. What should the ideal humidity level be in my house This will add about 20% to the home’s heating and cooling cost. What would cause high humidity in a house Often, the air conditioner can’t keep up with the extra humidity being brought in, so the air exchanger is shut off during the air conditioning season. Whats the normal humidity level in a house An air exchanger will cost about twice as much as most SSD systems, and can actually make a radon problem worse if it’s not cleaned and professionally serviced regularly. Acceptable humidity level in home An EPA study of radon systems found that 88% of air exchangers were not effectively reducing radon levels. Acceptable humidity levels in a house For these reasons, air exchangers are generally seen as a “last resort” for radon mitigation.