Latest Discussions : Basement & Foundation


06:02PM | 08/04/09
Member Since: 02/02/08
7 lifetime posts
I am looking for a way to put something on top of a basement floor which sometimes gets spots of dampness from seepage. I have been investigating a product called Delta FL

Has anyone used it? If so, what can you tell me about it? Thanks. Ruth


02:39AM | 08/05/09
Member Since: 03/03/05
271 lifetime posts
To be honest I do not like the product for use with wet floors. Often times people use this for the same intent as yourself only to find it gives mold the perfect environment to colonize. I have pulled up many of these floors in the Boston area due to mold issues.

I personally recommend this product for dry use as an insulator from the cold cement.

No matter what, you cannot leave water unaddressed under that type of floor or I guarantee you will have mold issues.

I'll monitor this post to see if you have any further questions.


10:04AM | 08/05/09
Member Since: 02/02/08
7 lifetime posts
King--The Delta folks say that their product allows air flow and prevents mold because there are no open seams. There appear to be three similar but different products. this one comes in long rolls rather than in squares. So I have two questions: the floors you have removed--are they Delta FL or one of the competitors. Were the strips correctly taped?

In terms of clearing up the water problem, I don't think that will happen. My house is 104 years old. I have no idea how thick the concrete floor is, and the head room is barely enough to make it comfortable to walk. My house is built into a hill so that the front of the house is street level. The basement at the back is 7.5 foot. It is in Portland, Oregon where we have somewhat of a high water table. Especially when we have a dry summer and then heavy steady rain that comes down too fast for the soil to absorb, there is not a lot that can be done. I do not get standing water, but rather dark patches on the concrete occasionally.

When i have taped down plastic and left it for up to a week, I get no condensation droplets. At this point, the basement has no smell of mold and I want to keep it that way, but I want to put down a floor because working/standing on concrete is hard and in the winter is cold.

What suggestions do you have?


07:10PM | 08/05/09
Member Since: 03/03/05
271 lifetime posts
I know they claim their product allows air flow, and to a certain extent it does. However, it is not adequate to allow wicking unless you have something pulling or pushing air through the cavity. Otherwise the air is stagnant and moisture will be trapped.

Mold spores are everywhere in a home and unless you have HEPA air filters running and you HEPA vacuum the floor, you will have mold spores. Spores are also found in ground water and can be introduced to a house with ease. If an area is dry, these spores will stay dormant until there is sufficient moisture to reproduce. So standing water/moisture under the Delta product will only harbor mold.

If you do not need the entire floor of the basement covered, you may want to consider making an elevated stage. Run the boards perpendicular to the open end. The open end will allow you to direct a fan under the stage as a way of wicking the moisture off the cement floor when needed in conjunction with a dehumidifier.

You can make it in sections 4x8 that would allow you to clean under it a few times a year or to allow access in case of flooding.

It would be best to use aluminum studs however the floor would be noisy if you allow it to float instead of securing it to the floor.

I have removed floors with Delta's systems and others. I am about to rip up another next week for the same reason...trapped water led to stachybotrys (toxic black mold).

People always say that the floor was clean when the floor was installed and yet over time dust, debris and dander make their way under the floor. Most of the time it is delivered by water flow.

If ground water brings mold spores with it, no amount of tape in the world is going to help.

Once you understand the dynamics of how mold can enter a home, you will understand why their systems are only good for certain applications.

I have nothing against Delta or their products, I just have issue with their products being used in certain situations. Also, I am not stating that if you do install a Delta product that you will have mold problems. Given what you have written, if it were me I would not put it in my house.

I hope my reply was proper and informative. We can always chat by telephone if you have any further questions, or you can keep posting so others may benefit from this thread.


07:19PM | 08/05/09
Member Since: 02/02/08
7 lifetime posts
Thanks for taking time to respond. Your reply is both helpful and polite--given some of the badinage on this list, I appreciate that.

I am hoping to hear from other folks also.

Because of the low clearance in the basement (and the ducts hang into some of the head space, the platform idea is not real workable, though perhaps 1x1 might work without creating too much problem.


11:23AM | 07/16/14
How can Mould grow when there is nothing organic to breed on? Mold cannot grow on either the concrete or plastic subfloor. It might not allow moisture to dissipate if the airflow is non existent but as described, it would be impossible for mold to breed.


06:49PM | 04/16/15
King, If you don't recommend DELTA FL, what do you recommend to put on a concrete floor to improve the comfort level of a room above...without creating a mold problem. I thought plastic dimpled products was not organic therefore was perfect to avoid mold from growing. Thx!

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