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How do you know if your home has mold growth in the crawl space?


Here in Tampa, one thing that is really crucial for people to think with is that during the rainy season, mold growth in crawl spaces can occur on the bottom of the home.


If your home has space between the ground and subfloor, like a crawl space, then that hot humid air can actually come up and establish mold growth, such as Penicillium and Aspergillus, on the bottom planks.


Why is this an issue though? It’s just the bottom of the home. You don’t even see it.


Well, mold releases microscopic particles in the form of a gas called Mycotoxins. Mycotoxins create adverse physical reactions such as headaches, brain fog, and respiratory issues and in some cases can impact the central nervous system to name a few.


Typically, from mold growth, there’s a musty smell that can actually intrude into the home due to the mycotoxins entering into the building envelope. You know when you hear, “Oh it’s just an old Florida smell!” NO – that’s actually a musty smell and if it’s musty that means mold.

If you think your crawl space has mold, call us here at Mold Zero to set up a free in-home evaluation.




After Tropical Storm Eta, here in Tampa Bay, we got a number of calls saying, “my house flooded”.

There were many homes that were a foot and a half under water.

When a storm like that occurs, you’re talking about Category 3, Black Water.

It’s water that’s going to make you sick.  There’s all kinds of stuff, bacteria and nastiness, in that storm surge, and it’s now in your home.


While I was driving in the area right after the storm I was observing all the storm damage.

But it was only 1 out of every 10 homes where they actually had a professional drying company in their home.

Drying professionally is key to preventing mold growth.

One of the things that is not known broadly, is at Mold Zero we do do the actual drying too.  We specialize in both mold removal and mold prevention.

Mold prevention requires that we are certified and trained in drying.

Our CEO actually trained in one of the top drying academies in the world, Dewald Academy of Drying.


I went into this home in Saint Petersburg, Florida and it was completely musty.  This means the mold was already growing.

All it takes is 48-72 hours for mold to start growing.

This was 5 days after the flood.  This home owner had his own dehumidifiers going. He had his own blowers going, but he didn’t hire a professional restoration company to come in and dry this place out. If you ever run into a situation where you are about to make a call to say “my house flooded”, remember this number 727-NO-WATER.

The concept of dry to the layman compared to what dry actually means are two completely different things.


So I put the moisture meter up to the wall and it’s reading 100% wet in terms of that moisture level.  That is absolutely a level where mold is going to start growing, yet to him, it seemed dry.  By touch and sight it was dry, yet the meter was letting us know it was still very wet.

That’s one of my biggest concerns is that people feel their home is safe just because the water looks gone.

Just because the water is gone visually and you don’t see it or don’t feel it, doesn’t mean that it’s actually dry.

Make sure you hire a company like Mold Zero to come and dry out your home.

Here is an easy tip to remember.  If you have a flood in Tampa Bay or Pinellas County call 727-NO-WATER for 24/7 Water Removal help.

If your home is flooded call 727-NO-WATER.



The first signs of mold in air vents is when you have cold air hitting warm air. That is the start to mold growth on your air vents and AC ducts. Mold really starts growing in the actual plenum. Before you know it, the ducts sweat and you end up having a situation where there’s mold growth.

You then start to see it manifesting on the air vents. A lot of people think it’s just dirt or dust when it is in fact a particular type of mold called cladosporium. (see mold library) Cladosporium is an allergenic mold.

Signs of mold in air vents can go from cladosporium, to then also having penicillium aspergillus on the vents and ducts. So you get a buildup starting to occur and now now goes airborne and starts contaminating others physical items and furniture throughout the home.

If your air conditioner isn’t working the way it should, which may be do to mold growth, you’re going to end up with humidity levels that aren’t ideal.

As soon as you start going over 60% humidity, and if that’s continuous and not drying out, you’re going to start seeing growth on shoes, on leather bags, on jackets etc. Once you are seeing growth physically manifesting, it is way past the point you want to be.

VIDEO: From the "Moldy" Documentary by Dave Asprey

Mold Problem

How Mold Contaminates a Home or Building?

The first situation which starts the process of mold developing are wet or damp conditions. These conditions can come from water leaks, constricted air flow, condensation or even poor construction.

One issue which mold presents to home owners and other property owners is that the removal can sometimes require a very detailed procedure, that if not followed, will result in mold agitation and future mold issue and property damage.

Air quality test or swab samples are the best methods to determine if there is a mold problem especially when there isn’t an obvious conclusion. Containment of an area with a known mold contamination is a standard action and highly recommended.  Cross contamination is almost inevitable but a proper containment helps to reduce the spread. Mold Zero uses a whole home approach to mold  remediation for this exact reason, cross contamination will occur simply due to air flow in a home.

Flu Like Symptoms

Mold growth can be obvious and out in the open, however it is often not very visible. When there is mold in the environment, mold spores (and the toxins they release) are spread though the air. This contaminates the furniture, cloths and all belongings in that space. Anyone living or working in the space gets exposed to the toxins. This can produce systemic body poisoning from the mold toxins. It can also bring about mild to severe sickness in individuals. Once the body is weakened by these toxins, mold can directly start to effect other organs in the body.

How mold contaminates a home or building, and when this is occurring in a home, a person feeling ill tends to want to stay at home. A cycle begins of feeling worse and worse in the moldy environment. Being microscopic, and unseen, it is common for the situation to go unnoticed. Many doctors here in Florida have recommended a whole home treatment like ours for mold. When their patients continue to exhibit flu like symptoms even after the administration of physical treatments, treating the home is a logical next step.

We are not doctors and cannot say whether or not certain conditions you may be experiencing is are due to mold a problem. However, what we can say is that if you have a mold problem, no problem, we know mold!