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promisedland74
Crawl Space Encapsulation
promisedland74

I have a musty, mold smell that comes up from the dirt crawl space under my house into the rest of my house. I have been researching crawl space encapsulation. Has anyone ever had this done? Basement Systems has been out to my house and gave me an estimate of $3500.00 to totally clean space encapsulate my crawl space. Before I have this done I would appreciate any feedback anyone can give me.

ordjen
Re: Crawl Space Encapsulation
ordjen

What does your contractor intend to do for $3500? At a minimum, the bare earth should be covered with at least 6Mil plastic sheeting as a vapor barrier. Moisture and mildew is the source of your musty smell. Treating the area first with Concrobium (www.Concrobium.com ) will kill the musty smell and leave a residue which will retard its return. Concrobium is an odorless and totally safe product which can be sprayed on with a common garden sprayer or used with a vaporizer. These two items are a doable DIY project, especially if there is good headroom down there. If it is a shallow crawlspace, crawling on your belly is not fun!

Does your contractor intend to close the vents permanently, thus making the crawlspace a part of the house envelope, much like a deep basement? This is not a bad idea in cold climates as the water lines are commonly down there and subject to freezing. It also tends to make the living area above more comfortable, as the crawlspace will naturally stay warmer. It is also possible to divert heat down there, making the house above much more comfortable with warm floors. If heated, the foundation walls should be insulated and the insulation can be removed from the crawlspace ceiling.

mhunts56
Re: Crawl Space Encapsulation
mhunts56

I encapsulated myself. I had a water problem under my house. Water would pool up after it rained hard. I had a french drain installed in the crawlspace, with two sump pumps that pumped the water out. I then installed 12 mil plastic and attached it to the walls with plastic pins inserted into holes i drilled into the brick/block. I overlapped the seams by 12 inches and tapped them. I seal between the plastic and wall with spray foam(great stuff). I closed all the vents and sealed them with foam board and great stuff. I installed a dehumidifier. This prevented all mold and wood rot in the crawlspace, but there was still a smell... The smell was coming from the ground. Since there was so much moisture built up the ground was soaked under the plastic and I guess the organic matter under the plastic was rotting. So I went back and pushed black corrugated pipe in a loop around the crawlspace under the plastic... very difficult after placing the plastic down and sealing it unfortunately, I suggest you do this prior to placing the plastic. I then hooked the pipe up to a radon fan to suck the gasses and smell out from under the plastic. Finally I have a good crawlspace under the house. I hate crawlspaces. If I have a house built I'll have a rat slab put in to avoid all this. My lot has a negative slop this has made my situation particularly bad.

ordjen
Re: Crawl Space Encapsulation
ordjen

I would have to agree that if I were custom building a house, the crawl space would have a cement slab installed along with a sump pump system. I would also go deep enough so I could actually get up and crawl on my knees. Although, with a cement floor , a mechanics creeper would make moving around down there relatively easy.

promisedland74
Re: Crawl Space Encapsulation
promisedland74

Basement Systems is the company that gave me the estimate. They are going to remove old insulation, rake debris, spray boron mold treatment on the stone & all wood. They use a liner 20-mil-thick, manufactured in 7 layers. high & low-density polyethylene, 2 layers of polyester cord reinforcement. The Clean Space liner is manufactured with an antimicrobial additive called Ultra Fresh. They completely isolate the crawl space, seal outside air and humidity. They cut out the liner to cover the floor of the crawl space and secure it up to the walls with nylon fasteners. The top edge is sealed to the walls with polyurethane sealant. The top edge of the liner seams are sealed with 4" wide sealing tape made for the liner. They also seal around pipes, columns & piers and cover all vents. They totally seal up the crawl space so no air or humidity comes up through the house. I was also given a 25 year warranty and is transferable to the next owner. My house was built in the early 50s, the crawl space is 19' X 24' & accessible only by "crawling". Not a job I want to do. After reading the above, I feel pretty confident. Still looking for opinions. Thanks for posting

ordjen
Re: Crawl Space Encapsulation
ordjen

My impression is that the quote seems as if they are going to do a thorough job, however, somewhat pricey for such a small area, about the size of a two car garage, especially since no sump pump or drainage is called for.

promisedland74
Re: Crawl Space Encapsulation
promisedland74

Thanks for your feed back. Going to try and negotiate the price down.

promisedland74
Re: Crawl Space Encapsulation
promisedland74

Best decision I made was to have my crawl space totally encapsulated by ITG Basement Solutions. I noticed the results in the air of my home the day the job was completed. It was worth the money. The foreman and his work crew were very professional and very informative. They worked hard and completed the job within 4 hours. I highly recommend hiring a professional company take on this project. I did a lot of research and the products ITG Basement Solutions uses along with their crew's experience, was totally worth every cent. I do not have the moldy, mildew odor in my home.

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