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Started By
Message
Flex seal to seal outside of crawl space.
Posted on 3/29/19 at 9:05 am
Posted on 3/29/19 at 9:05 am
Recently purchased an older home with a crawl space. Contractor came out to quote on a few things and one item he mentioned I could do myself is dig a trench along the outside of the house (about 8-10 inches deep) and seal the crawl space with flex seal.
Would be spraying directly on brick to help water proof the crawl space.
Anyone have experience doing this on similar projects? What results did you see?
Would be spraying directly on brick to help water proof the crawl space.
Anyone have experience doing this on similar projects? What results did you see?
3
Posted on 3/29/19 at 9:09 am to someLSUdoosh
What part of the country is this home located? It has a chain wall that goes into the ground under the frost line and then you have a pier and beam foundation? Is this correct?
Do you have pics? How is the water getting under the home, seepage through the brick chain wall?
Do you have pics? How is the water getting under the home, seepage through the brick chain wall?
Posted on 3/29/19 at 10:25 am to wickowick
Carolinas.
Water is seeping through the brick and causing moisture in the crawl space.
Water is seeping through the brick and causing moisture in the crawl space.
This post was edited on 3/29/19 at 10:26 am
Posted on 3/29/19 at 10:30 am to someLSUdoosh
Apparently, water is not flowing away from the home, is the water coming from the roof line or somewhere else?
Posted on 3/29/19 at 10:51 am to someLSUdoosh
What's on the floor?
I have a crawlspace and have experimented with many variables, and the best path seems to be letting the floor stay dirt and keeping all vents closed.
Moisture gets absorbed by the ground, just enough conditioned air escapes from the ductwork to keep it less humid (than when I used to keep vents open, simply letting more humid air in).
I have a crawlspace and have experimented with many variables, and the best path seems to be letting the floor stay dirt and keeping all vents closed.
Moisture gets absorbed by the ground, just enough conditioned air escapes from the ductwork to keep it less humid (than when I used to keep vents open, simply letting more humid air in).
Posted on 3/29/19 at 12:17 pm to LSUfan20005
Yard is slopped at a downward angle to the front of my house. I have two vents that water seeps through as well as have been advised to flex seal around the entire foundation.
Just trying to see if anyone has done it before. Can provide pics later.
The floor of the crawl space is dirt. the vents are open that is most likely the issue.
Just trying to see if anyone has done it before. Can provide pics later.
The floor of the crawl space is dirt. the vents are open that is most likely the issue.
This post was edited on 3/29/19 at 12:17 pm
Posted on 3/29/19 at 12:31 pm to someLSUdoosh
quote:
Yard is slopped at a downward angle to the front of my house. I have two vents that water seeps through as well as have been advised to flex seal around the entire foundation.
Watch the water during and after a good rain. The water under the house is a symptom, the cause is what you want to fix. You either need gutters, drains or a combination of both to keep the water from collecting around the chain wall.
The vents are your friend, without them your subfloor and floor stringers would rot out over time.
Posted on 3/29/19 at 12:53 pm to wickowick
Have gutters....the plan, in full, was to dig and seal the crawl space and then build french drains around the front and sides of the house to drain down the slope through the back yard.
Posted on 3/29/19 at 1:10 pm to someLSUdoosh
quote:
Have gutters....the plan, in full, was to dig and seal the crawl space and then build french drains around the front and sides of the house to drain down the slope through the back yard.
and now we have the rest of the story. In south Louisiana, this isn't really common because the land is flat and we don't have to get below the freeze line. I know there are waterproofing coatings out there, if I was going to spend the labor to dig up all that dirt, I would spend the money on a product that was designed for the job at hand.
I would think that the french drains would fix 95% of your problem, but I could be wrong. Also, make sure the water from the gutters is disposed of in such a way that it flows well away from the home.
Posted on 3/29/19 at 2:50 pm to someLSUdoosh
Henry foundation coating.
LINK
You may want to put a vapor barrier down in the crawl also and may want to check radon levels if dwelling built on rocky soil.
LINK
You may want to put a vapor barrier down in the crawl also and may want to check radon levels if dwelling built on rocky soil.
This post was edited on 3/29/19 at 2:52 pm
Posted on 3/29/19 at 9:46 pm to ItNeverRains
You really don’t want to seal the underside of your house unless you also plan to dehumidify it. If you just seal it, Mold City, USA.
Posted on 4/1/19 at 6:44 am to poochie
quote:
You really don’t want to seal the underside of your house unless you also plan to dehumidify it. If you just seal it, Mold City, USA
closed conditioned crawlspace done correctly will prevent this. It’s about 6k more vs open crawlspace on the front end, but open vented crawl will ALWAYS develop mold.
Now I have both a dehum and a sump pump in my closed conditioned crawlspace. Dehum is tied in my hvac, house is so tight traps humidity. Your positive drain if done correctly should move water from under house. I’m on the base of a 20’ hill so sump pump gives me a little extra power to move water. My crawl on left side house is almost 6’ tall. Was down there last week cleaning filter for dehum absolutely no moisture humidity right at 45%
This post was edited on 4/1/19 at 7:38 am
Posted on 4/1/19 at 10:25 am to poochie
So the advise I was given was to seal the outside brick layer (beneath the dirt line) with flex seal to stop water from seeping into the brick.
After that I am going to build french drains in the front and around the sides of the house to divert the water.
The crawl space is vented and we are just trying to control moisture.
After that I am going to build french drains in the front and around the sides of the house to divert the water.
The crawl space is vented and we are just trying to control moisture.
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