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Question DetailsAsked on 8/1/2012

Do I need a sump pump in my crawl space?

We had our air ducts cleaned. There was some mold on the fan in the furnace. (Furnace is in the garage) So they checked under the house to see if there was any moisture there. They said the sheeting was improperly installed, that is to be on the walls and was not. It was just on the ground in the crawl space. They said there was some moisture,, but no puddles. They said new sheeting and a sump pump should be installed. I can understand the sheeting, but do we really need a sump pump?

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2 Answers


Best guess not seeing any groundwater or standing water in crawl space a pump would not be necessary. A moisture barrier of 6mil black poly laid over the floor with the seams sealed and going up the crawl space walls and sealed at the top is the old standard. This is a possible doitselfer project. The seam sealant could be stainless steel tape or a polimer caulk like GeoCell in a continious bead.

Completing the project the floor joists above can be insulated with fiberglass batts stapled. The crawl space can be vented in the non heating season, and you can even use a dense blue board poly on the walls instead of running the poly all the way up the walls and gain some insulation if you live in a cold climate. Dont forget to insulate the band joist area above the ?block wall>

Jim Casper old gutter contractor (retired)

old energy conservation contractor (retired)


Answered 8 years ago by jccasper


Hi Max,

It is hard to say without seeing any images. If it is only a moisture problem, then I would say no, you do not need a sump pump. Just ensure that there is a steady supply of air passing through the crawl space to ensure the area stays ventilated and that excesse moisture is carried away. To do that, ensure your air bricks are clear or install additional air bricks.

If however, you are having a regular issue with puddles and excess amounts of water building up under your property, then yes, I would suggest consider a sump pump as the excess mositure could lead to addtional property problems such as wet or dry rot. However, before considering a sump pump, it may be an idea to consider how the water/mositure is getting there in the first place. Is it because the water management systems within the property are defective and need a little TLC. Is it because of the lay of the land and you need to install a drainage channel on the outside of the property to divert excess amounts of water? Could it be because of defective plumbing?

Before doing anything, I would strongly suggest contacting a few other companies for help and advice. Make sure you also check their credentials and whether they are a part of any professional bodies.

I hope the information helps and I hope you do not mind, but I have included a link to our sump pump range with a video comparing sump pumps and what you should look out for when enquiring about a quality sump pump.

Best regards



Answered 8 years ago by wiseandyf

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