35 votes
Accepted

Does A/C encourage mold growth

Yeah, that advice was super wrong. Moisture encourages mold growth. After a water leak you need to go to extremes to dry the air to get wet things to evaporate into the air, which you then ...
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28 votes

Any problem to build a house that covers a same-sized hole in the ground?

Look at it as a start on a foundation hole - but don't get hung up on "making the house the same size/shape as the existing hole" because you can alter the size/shape of the hole when ...
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  • 132k
25 votes

Does a portable fan work for drying the bathroom?

You need a dehumidifier. https://en.wikipedia.org/wiki/Dehumidifier If there is no way to blow the humid air out, run it thru a dehumidifier. You can keep it in the bathroom running on a timer or ...
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  • 5,498
21 votes

Does a portable fan work for drying the bathroom?

When the things in a bathroom dry the water is not simply disappearing, rather it is converting from liquid you can see and feel on the surfaces and towels into vapor in the air. In other words, ...
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  • 19.5k
20 votes
Accepted

Any problem to build a house that covers a same-sized hole in the ground?

You asked: Would there be any problem to build the wood house over the hole, so as to cover it? So I am going to make the following assumptions: You would like to personally build the house There ...
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16 votes

Does A/C encourage mold growth

You are being sold. The evaporator coil in the AC condenses water vapor in the air. It does this by blowing the warm air from your home over the cool evaporator coil. The cool coil pulls the moisture ...
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13 votes

Why doesn't AC equipment come with dehumidifier only option?

The coil on a good dehumidifier is SIGNIFICANTLY colder than the coil on a typical air conditioner. A typical central AC unit is configured so the air coming off the coil is approximately 20 degrees (...
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  • 584
13 votes

Does A/C encourage mold growth

It is possible for A/C to cause mold issues but it depends on a few factors. The problem is this: when choosing a A/C unit for a home, often people (even 'professionals') will assume that bigger is ...
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  • 1,761
7 votes

Why doesn't AC equipment come with dehumidifier only option?

Dehumidifiers work a bit different than A/C units. While A/C units do remove moisture, as a side effect. They also cool the air moving through them, by moving heat away. Dehumidifiers remove the ...
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  • 128k
5 votes

What are the pros and cons of a whole house humidifier?

I am a licensed contractor, home inspector and certified energy auditor. Energy audits using blower doors in conjunction with infrared is ideal for air leakage that leads to heat and humidity loss ...
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  • 59
5 votes

What are the pros and cons of a whole house humidifier?

The problem with adding humidity to a leaky home is amount of water vapor air can hold varies significantly with temperature. While 30% relative humidity at 72°F seems dry and harmless in and of ...
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5 votes

Is plastic paint a possible solution for a wall with humidity?

Trapping the water in the wall is no solution, it will only wreck the wall more quickly. Any paint you put on there will fall off the wall, as it will be pushed off by the water. I use a lot of ...
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5 votes
Accepted

How to construct a time capsule bottle?

It's really hard to assure that they won't be under load anytime in the next 50 years. Obviously, the bottles only need to break once to be ruined. Also, depending on the type of bottle, it might be ...
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  • 710
5 votes

Any problem to build a house that covers a same-sized hole in the ground?

You don't say where you live but you will get things living down there. Rats, foxes, badgers for example. They will leave faeces and dead stuff. Make sure you have access steps and built-in lighting.
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5 votes

Confused about humidity levels in basement - a math problem

Your basement is not nearly as sealed as you think. Which is actually a good thing. You need to constantly have make up air. That is air to replace the air you breathe. Otherwise, while your H2O is ...
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4 votes

What is a reasonable air-conditioning schedule to prevent humidity issues?

This question has received a lot of answers and comments, but I suspect not from people familiar with Florida who have encountered the underlying issue. It is a frequent one in Florida because: ...
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  • 5,816
4 votes
Accepted

draining sauna into crawlspace

Yes, it could lead to wood rot and a severe mold problem. Don't do it.
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  • 710
4 votes
Accepted

To reduce damp: heat or dehumidifier?

With "damp", your enemy is humidity, or water which is dissolved in the air. Warm air can disolve a lot more water than cool air. When warm, water-saturated air moves to a cooler place, it cools the ...
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4 votes
Accepted

Electric front load dryer making room extremely humid and wet

Most "traditional" electric dryers basically have a heating element, a fan, a motor and a control panel. The motor turns the drum, usually via a belt. The fan blows air past the heating ...
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4 votes
Accepted

Does the steam function on a dryer produce more humidity than a normal dry cycle?

This is one possibility from my history. Some vent systems don’t handle the extra moisture. yes at the start of a dry cycle the humidity is off the charts, however as the cloths dry and the same ...
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  • 95.4k
3 votes

While vacationing, is it worth augmenting AC with a dehumifier?

No, a separate dehumidifier is not better. It simply does not have the airflow of the AC. Running the central AC at 72 for an hour or two in the morning is a good idea to remove the moisture from the ...
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  • 18.7k
3 votes

How to better waterproof the shower area?

Yes, the tile joints do let water pass. The grout is porous, and additionally does not seal tight with the tiles as it ages (causing it to actually pull some water in via capillary action). Many tile ...
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  • 1,172
3 votes

How does hardwood floor acclimate to a location with variable humidity?

Humidity is variable everywhere. I live in the desert where the indoor humidity varies from 10% to 60% depending on the time of year. I've installed engineered hardwood and it's totally fine. Don't ...
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  • 12.2k
3 votes
Accepted

Are there drawbacks to installing a stronger bath fan?

While this would just be short term use. If you have natural gas, propane or oil appliances, this could & even would suck noxious fumes into the house which could eventually or quickly kill you. ...
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  • 9,779
3 votes

If it is important to humidify the air in winter for one's health, how then do you prevent condensation from forming on the inside of windows?

First, it's worth noting that "wind chill temperature" isn't an actual temperature. It's a way of describing the rate of heat loss as compared to a no-wind scenario. For purposes of this discussion, ...
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  • 104k
3 votes

Bathroom ceiling absorbs moisture and falls apart

I think at this point it's safe to say the drywall above the shower is shot, and now you're going to need to replace it all. While you're in there, install a proper exhaust fan. Yes, I know that's ...
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3 votes

What is a reasonable air-conditioning schedule to prevent humidity issues?

Humidity is relative. Air can hold so much water depending on its temperature. If fully saturated (100%) hot air is dramatically cooled, the water must condense out, which is how clouds and rain ...
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3 votes

Measuring humidity through ceramic tile to deduce a course of action

Water penetration is usually destructive, such that damage is detectable without fancy instruments. The tile grout on the outside of the curb would show signs of being wet and/or you might see ...
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  • 33.4k
3 votes

Why is my aircon increasing relative humidity?

For an A/C unit to reduce the % of relative humidity in your home a properly sized A/C unit coupled with a dehumidifier must run a long time to decrease that humidity. When the A/C unit is first ...
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