Hey there, Michael Church with Crawl Space Ninja and today we've got a great question
from Randy.
He contacted us through our Ask a Ninja submission page on our website, which we're gonna put
a link down below so you can do that if you like.
So stay tuned.
Okay, go right ahead.
There's a dirt crawl space, and there's never any standing water.
I do have a high water table in my area.
I dug a hole into the crawl space about a foot deep, and it never fills with water,
so I know I haven't hit the water table yet.
Anyways, it's like the dirt in the crawl space is always moist, never under standing water.
Okay.
And, I've run a dehumidifier down there for probably about a month and a half now.
And while the dehumidifier takes a lot of humidity out,
the soil is still wet.
I've heard of some of something called Wicking, and I'm wondering if that might be my problem.
The ground water seeping up into the top of the dirt crawl space.
Right, right.
Okay.
So, what's going on is, you've had put in a dehumidifier, is it a dirt floor?
In other words, there's not plastic, you don't have any plastic down, is that correct?
Right.
That's correct.
Okay.
So the dehumidifier is controlling humidity and doing a good job doing that.
Is it keeping it under 60%?
No, it's closer to 70%.
Okay.
Wicking is certainly a possibility, and just keep in mind that if you have vents, for example,
that are open in a crawl space.
All right, I'm just going to switch gears a little bit and, and so let's say you have
a crawl space, and all the events around the crawl space are open, and you put in a dehumidifier
and it's 70 percent, 80 percent humidity outside, and then you attempt to lower the humidity
in the crawl space.
The humid air is going to force itself into the crawl space faster because it's chasing
the dry air.
Does that make sense?
Oh, okay.
I understand that, yeah.
Yeah.
So I think that's probably what's going on with your soil, is that as you attempt to
lower the humidity in the crawl space, it's fighting a losing battle.
It's never going to get rid of all the soil moisture because-
Right.
Then it'll just come right back.
So that's why we put the plastic down.
The plastic, we call it a vapor barrier.
Some people say vapor retarder, but basically it's just plastic.
It's a class one, vapor barrier is what they call it.
And basically what it does, is it slows the evaporation down.
So in other words, it's creating a separation between the dry air and the soil.
Okay.
Now, the plastic does not stop the vapor from evaporating through it, which is what the
perm rating is all about.
So basically, the perm rating means that it either flows slow or fast through the plastic.
That's all it is.
So, you'll never stop the evaporation from the soil ever.
Oh.
Especially if you're near a lake like you said you are, right?
You said you have a high water table, you're near water?
Yes, mm-hmm (affirmative).
Yeah.
I've had houses on the side of mountains that's had high water table because of a spring or
something nearby.
So you're always going to be fighting that evaporation from the soil.
So, I would encourage you to put down a good plastic.
Now you can just put it down on the ground, that way it slows the evaporation.
And I think if you do that, if you're using a pretty decent dehumidifier, that should
help get that humidity below 60 percent, because you're slowing that evaporation down.
Okay.
And, you want the humidity below 60%.
I'd prefer 50.
But, you at least want it below 60 because if it stays above 60, it still has a potential
to spawn some fungal growth.
And then really, you don't want that to happen either.
What kind of dehumidifier are you using?
It's a Black and Decker 30 pint.
30 pint?
Mm-hmm (affirmative), yeah.
30 pint.
Okay.
And how big of a space-
Okay.
And how big is the crawl space?
Oh, it's about a 20 foot by 20 foot.
Okay.
About 400 square feet.
Okay.
So technically, that probably is sized properly by the time, I think a 30 pint could do about
three to 400 square feet.
But keep in mind, those are designed for finished areas.
So in other words, either a slab down in a basement or something like that, which is
also slowing the evaporation from the soil.
So, I think if you put in a plastic, it will make the dehumidifier run less, and become
more efficient.
'Cause I'm assuming it's not stopping.
It's probably running all the time, right?
It is.
24 hours a day.
Yeah.
Yeah.
'Cause it's trying to keep up with your high water-
That electric bills gonna be-
Yeah.
We just did a video with Brian Canfield of Aprilaire and he covers some
of the box store dehus and how they do use more energy because they don't run as efficiently.
So, I think he said an Aprilaire 1820, compared to 30, 40, or a 30 to 50
to 70 pint box store dehu would save you about $110 a year. I'm sorry, $110 a year.
Just because like you said, it never shuts off, it's running 24/7 'cause it can't keep
up.
But I think putting plastic down will be a great way to help that dehu who become more
efficient.
Okay.
Yeah, I was just wondering if the dehumidifier wasn't drawing out the humidity.
And then, through the wicking process it was just being replaced again.
That is correct.
I think that's what's going on, Randy.
I think you got it.
Yep.
Mm-hmm (affirmative), alright.
And a French drain probably wouldn't help me if there's no standing water.
No.
Some crawl space companies, they just automatically put in a French drain and, and we encourage
what you would call a French drain to a sump pump.
Especially if you haven't owned the house for very long because, we just had last year
I think in 2017, we had one of the biggest rain storms.
It was seven, eight days straight of rain, and there were crawl spaces that had never
flooded before and they flooded.
So you never know what's gonna happen.
So in that sense, I understand encouraging everyone to get a French drain and a sump
pump in a crawl space.
But from what you're telling me, that will not fix or help your situation.
Right.
Because you don't have any standing water.
Now-
Three or four years down the road-
If you went ahead and put one in, and then your crawl space floods, you're covered.
But stopping the evaporation, I would go with the vapor barrier first.
Alright.
We did have a problem back in March, a minor flood.
And, this was the only time I've ever had, in 19 years, the only time I've ever had standing
water in the crawl space.
Oh Wow.
Okay.
And the water actually wasn't coming in from the wall area, it was bubbling up through
the dirt.
Through the dirt.
Right, right.
And it was actually bubbling up through the middle of the floor and through the dirt.
Well keep in mind too, another part of the French drain is a vapor barrier.
Because if you don't have a good plastic down and have it attached to where it won't bubble
up above the plastics.
So in other words, it's overlapped and taped properly, that plastic helps to keep the water
under the vapor barrier in order to push it to either your sump pump or your French drain. Okay?
I see.
Because, once it gets above that plastic, it may not ever make it to your French drain
because now it's separated from where it needs to be in order to migrate to the French drain
you see.
So you got to have it installed properly for the French drain even to work also.
Right.
Alright.
So, would you recommend the French drain and the vapor barrier?
Well, if you were here in Knoxville, I would certainly let you know that I would recommend
a French drain.
And you can choose not to do it, but just keep in mind that if you were going to hire
us, and then your crawl space floods, and you told me Michael, I don't want a French
drain, well then you change your mind.
Now I got to go rip all the plastic out that we put in, which costs more money-
Right.
To put the French drain in.
So-
Right.
I think I would err on the side of caution in your situation and go ahead and put one
in.
I mean 400 square feet, the material isn't going to be that much if you're going to do
it yourself.
Right.
Right.
Okay, well Michael, I thank you very much.
Well we thank you too Randy, and thanks again for letting us have you on our YouTube channel.
Okay?
Hope you have a great day.
Okay, you too. Thanks.
Thanks.
Bye.
Well Randy, it was great talking to you about a potential wicking of moisture out of the
ground, and vapor barriers, and French drains.
We had a great conversation.
I really appreciate you taking time to help educate everyone out there in the world that
has questions just like yours.
And, appreciate everyone watching, and we hope you make it a happy and blessed day.
And I hope you like this video down below and we'll see you next time.
God bless and we'll see you later.




Không có nhận xét nào:
Đăng nhận xét