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Old 11-08-2012, 08:40 PM   #16
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Crawl space vent and mold question


Robby.....normally I would keep quiet on this kind of subject....the only mold expierence I have is with my house....but seeing how he most likely lives within a mile or two of me....and all these houses were built the same way and about the same time....well....worth sharing my thoughts...

Now...I hope he posts back as to if he has the floor heater like I think he does.

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Old 11-08-2012, 10:38 PM   #17
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Crawl space vent and mold question


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Jim....I live right down the road from you.......as in....near El Camino College.....

I don't think you need to do anything with your crawl space.

The mold issue we had was caused by furnature up against the wall. Where ever there was furnature against the wall...we had mold.

Let me guess....your also still using the in floor heater? Half in the hallway...other half in a main room?

We installed forced air heating about 6 years ago and that pretty much took care of the issue.

Moot issue now....the back half of the house is gone now.....click on the link in my signature and you will see why.....

In fact...drive down Manhattan Beach...and you will see my house...stop by...have a beer...
I know exactly where you are located. I am near the corner of Palos Verdes Blvd and PCH.

Well, the mold issue is worse with furniture up against the walls but it is still present without the furniture as well. I just bought a hygrometer and I measured the RH at 65% in my home! That is high. I been running my dehumidifier all day to drop the level. The damp rid also helps.

This great article from MSU states one of the causes of high humidity is from the crawl space especially with mold in closets. One room has this issue.

http://www.msue.msu.edu/objects/cont...01500575.html/

When I bought the home three years ago, the previous owner placed a forced air heater in the attic. There is no form of an air conditioner as my neighbor noted that none of the original homes in this area had an air conditioner.

I am not sure if I'm barking up the wrong tree blaming the crawl space but it seems logical considering my problem spots happen to be located where the vents are open on the exterior of my home. When I last crawled under there, the presence of mold was none. I did not look corner to corner but from what I saw there did not appear to be mold on the joists nor subfloor.
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Old 11-08-2012, 11:24 PM   #18
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Crawl space vent and mold question


I would be inclined to think that the only corrolation between the crawl space vent and your mold is the temp. Where you are, the marine layer is a bit more than me....but....the humidity level in your house is actually more of a function of what is going on inside....

Because of the crawl space vent, the temp in that area drops....which condenses any moisture on the wall...which feeds the mold.

I'm assuming you close the windows in the winter time?

Your heater is gas fired?

Do you by any chance have carpet in the affected areas?

As I said before, once you have mold....it's in there....as far as I know, the only real way to get rid of it is to remove the material it is in.

Have you tried pulling the furniture away from the wall? This would allow more air flow and thus cut down on the condensation in that area.
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Old 11-09-2012, 12:28 AM   #19
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Crawl space vent and mold question


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I would be inclined to think that the only corrolation between the crawl space vent and your mold is the temp. Where you are, the marine layer is a bit more than me....but....the humidity level in your house is actually more of a function of what is going on inside....

Because of the crawl space vent, the temp in that area drops....which condenses any moisture on the wall...which feeds the mold.

I'm assuming you close the windows in the winter time?

Your heater is gas fired?

Do you by any chance have carpet in the affected areas?

As I said before, once you have mold....it's in there....as far as I know, the only real way to get rid of it is to remove the material it is in.

Have you tried pulling the furniture away from the wall? This would allow more air flow and thus cut down on the condensation in that area.
Thanks for your input.


Yes, windows closed almost all winter except some occasions to get fresh air.


My heater is gas driven. I rarely run it unless its very cold. I have not turned it on since last winter yet.


The only form of carpet we have are rugs but they are no where near the windows nor walls with the issue. I pulled away the furniture and placed damp rid in the most problematic areas. It helps but mildew forms over time even in the areas where nothing is near the walls.


What do you think is causing the high humidity? The air hears always seems humid being near the ocean.
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Old 11-09-2012, 12:42 AM   #20
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Crawl space vent and mold question


I think the combination of the crawl space vent and no insulation causes that part of the wall to be colder and condense any moisture in the air....thus....mold.

It's not really that hard to yank off the drywall and replace it....while your at it...insulate the wall.

I have been doing that to my house....I'm now down to just one section of wall without insulation....and it's such a small section...and East facing so I'm not going to worry about it.
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Old 11-09-2012, 12:43 AM   #21
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Yes insulate your crawl space. You can close your vents also which will prevent humid air to escape through walls. If you have moisture problem then vapor barrier can solve your problem.
Very bad advice for the area the OP is in....
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Old 11-09-2012, 03:58 AM   #22
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Have you tried pulling the furniture away from the wall? This would allow more air flow and thus cut down on the condensation in that area.
---------------------------------------------------------------------
I've never heard of furniture needing to be moved from the wall but I still see all kinds of shrubs and flower beds being planted next to the structures world wide which certainly isn't an asset in situations like being discussed not to mention fire danger.
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Old 11-09-2012, 10:01 AM   #23
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I've never heard of furniture needing to be moved from the wall but I still see all kinds of shrubs and flower beds being planted next to the structures world wide which certainly isn't an asset in situations like being discussed not to mention fire danger.
He has stucco on the outside.....

As for moving the furnature.....with a dresser up agains the wall, it reduces/prevents air flow....and because there is no insulation in the wall....that section of wall gets cold which in turn condensed moisture in the air...which causes the mold.
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Old 11-09-2012, 10:06 AM   #24
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Crawl space vent and mold question


Jim.....the building code in our area is pretty specific about crawlspace ventilation....here is a blurb from my drawings....note...this is current requrements...

UNDER FLOOR AREAS SHALL BE VENTILATED BY MECHANICAL MEANS OR BY OPENINGS INTO THE
UNDERFLOOR AREA WALLS. SUCH OPENINGS SHALL HAVE A NET AREA OF NOT LESS 1 SQUARE FOOT
FOR EACH 150 SQ. FT. OF UNDER FLOOR AREA. OPENINGS SHALL BE LOCATED AS CLOSE AS POSSIBLE
TO CORNERS AND PROVIDE CROSS VENTILATION. THE OPENINGS SHALL BE APPROXIMATELY EQUALLY
DISTRIBUTED ALONG THE LENGTH OF AT LEAST TWO SIDES. CORROSION RESISTANT MESH WITH
MINIMUM !” OPENINGS

I think if you go into your crawl space you will not see any mold....mine is pretty dry....and stays that way....

Like I said...I had the same problem....on walls where I have insulated....no issues....

Check you PM
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Old 11-10-2012, 01:20 PM   #25
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Crawl space vent and mold question


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He has stucco on the outside.....

As for moving the furnature.....with a dresser up agains the wall, it reduces/prevents air flow....and because there is no insulation in the wall....that section of wall gets cold which in turn condensed moisture in the air...which causes the mold.
I found this to be the case. The more furniture up against the wall equated to less air flow and mold would aggregate in that area worse than other spots.


I guess I'm going to have to insulate the walls then. I didn't want to do anything interior. The insulation via foam on the outer walls by drilling holes is an expenisve alternative I guess.

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