Serving MS including the Greater Jackson area
Our Mississippi Service Area
Cities in Attala County, MS
Ethel
Kosciusko
Mc Cool
McAdams
Sallis
Williamsville
Zama

Cities in Claiborne County, MS
Alcorn State
Carlisle
Grand Gulf
Hermanville
Pattison
Port Gibson
Russum

Cities in Clarke County, MS
De Soto
Enterprise
Pachuta
Quitman
Shubuta
Stonewall

Cities in Copiah County, MS
Beauregard
Carpenter
Crystal Springs
Dentville
Egypt Hill
Gallman
Georgetown
Hazlehurst
Hopewell
Jack
Martinsville
Wesson

Cities in Covington County, MS
Collins
Dry Creek
Leaf River
Lone Star
Lux
Mount Olive
Okahay
Ora
Rock Hill
Salem
Sanford
Seminary
Sunset
Williamsburg

Cities in Hinds County, MS
Bolton
Brownsville
Byram
Clinton
Edwards
Jackson
Learned
Oakley
Pocahontas
Raymond
Terry
Utica

Cities in Holmes County, MS
Acona
Coxburg
Cruger
Durant
Ebenezer
Egypt
Franklin
Goodman
Howard
Ituma
Lexington
Marcella
Montgomery
Owens Wells
Pickens
Tchula
Thornton
Tolarville
West

Cities in Humphreys County, MS
Belzoni
Isola
Louise
Midnight
Silver City

Cities in Issaquena County, MS
Filter
Mayersville
Valley Park

Cities in Jasper County, MS
Baxter
Bay Springs
Garlandville
Heidelberg
Lake Como
Louin
Montrose
Moss
Paulding
Rose Hill
Stringer
Vossburg

Cities in Jefferson County, MS
Church Hill
Fayette
Harriston
Lorman
Perth
Red Lick
Rodney
Union Church

Cities in Jones County, MS
Ellisville
Laurel
Moselle
Ovett
Soso

Cities in Lauderdale County, MS
Bailey
Collinsville
Daleville
Kewanee
Lauderdale
Marion
Meridian
Meridian Station
Nellieburg
Russell
Toomsuba
Whynot

Cities in Lawrence County, MS
Jayess
Monticello
New Hebron
Newhebron
Nola
Oak Vale
Oma
Silver Creek
Sontag
Wanilla

Cities in Leake County, MS
Carthage
Edinburg
Good Hope
Lena
Madden
Ofahoma
Redwater
Sebastopol
Standing Pine
Thomastown
Walnut Grove

Cities in Lincoln County, MS
Auburn
Bogue Chitto
Brookhaven
East Lincoln
Woolworth

Cities in Madison County, MS
Camden
Canton
Farmhaven
Flora
Gluckstadt
Jackson
Kearney Park
Madison
Ridgeland
Sharon

Cities in Neshoba County, MS
Bogue Chitto
Burnside
Choctaw
Neshoba
Pearl River
Philadelphia
Stallo
Tucker
Union
Williamsville

Cities in Newton County, MS
Chunky
Conehatta
Decatur
Duffee
Hickory
Lake
Lawrence
Little Rock
Newton
Union

Cities in Rankin County, MS
Brandon
Cato
Crossgates Farm
Florence
Flowood
Frannin
Jackson
Johns
Leesburg
Pearl
Pelahatchie
Piney Woods
Puckett
Richland
Robinhood
Sandhill
Shady Lakes
Star
Value
Whitfield

Cities in Scott County, MS
Forest
Forkville
Harperville
Hillsboro
Homewoodv
Lake
Ludlow
Morton
Norris
Pulaski
Sebastopol

Cities in Sharkey County, MS
Anguilla
Cary
Delta City
Nitta Yuma
Onward
Panther Burn
Patmos
Rolling Fork

Cities in Simpson County, MS
Braxton
D'Lo
Harrisville
Magee
Mendenhall
Pinola
Weathersby

Cities in Smith County, MS
Burns
Mize
Polkville
Raleigh
Summerland
Sylvarena
Taylorsville

Cities in Warren County, MS
Bovina
Eagle Bend
Flowers
Redwood
Tokena
Vicksburg
Waltersville
Warrenton

Cities in Yazoo County, MS
Anding
Benton
Bentonia
Carter
Eden
Holly Bluff
Hopewell Landing
Little Yazoo
Oil City
Satartia
Tinsley
Vaughan
Yazoo City

Our Locations:

MidSouth Crawlspace Solutions
158 Hickory Hill Cove
Pearl, MS 39208
1-601-667-2035
Nu-Wool Premium Cellulose Insulation Installer

Does Humid Air Move Up or Down?

Thursday, September 23rd, 2010 by Marianne Koiva


Rain Clouds and Humidity

If humid air sinks, where do clouds and rain come from?

There are two classic arguments used to explain where humid air goes in a home in Jackson, Vicksburg, Greenville, Lexington and the central MS area.

Argument 1: Wet air is heavier than dry air. Ventilate and dehumidify the crawl space to solve this.

 

The idea here is that as air becomes humid in a home, it becomes heavier, causing it to sink down into the crawl space and lower levels of the home. 

Therefore, ventilating the crawlspace with outside air will circulate this humid air out of the home and keep the space dry.

Basement Vent and RotIf humid air sinks, will this ground level vent keep the crawlspace dry?

Problem 1: Humid air is less dense than dry air.

Dense things sink and less dense things rise, right?  Well, according to Isaac Newton, in his book Opticks, (and USA Today) humid air is actually LESS dense than dry air.

It makes sense. If humid air didn't rise, why would rain fall from the sky when the temperature drops?

So, in a home, humid air rises up, not down.

Problem 2: If humid air WAS denser than dry air, basement vents still wouldn't work.

Let's pretend that dry air IS lighter than wet air. Where are the vents going to be in the crawl space? At ground level, right? 

If humid air did sink, wouldn't it flow downwards into the crawlspace through the vents?

vented damp crawl space in Greenwood, MS

Is this vent keeping the basement dry and mold-free?

Problem 3: Outside air isn't always dry.

If it's raining, humid, or damp outside, how dry will ventilated outside air make your basement? Not very, right? 

And what happens to your utility bills if you're venting cold air into the home in the winter, or hot air in the summer? 

You can count on some heavy utility bills. We insulate this air out of our home for a reason - because we don't want it in the house.

Argument 2: Sealing off the outside air and dehumidifying the space will keep it dry.

 
efflorescence from damp basement wallsEven with a seemingly dry basement wall, this white powder (efflorescence) reveals that moisture has been passing through the concrete walls.

Other crawlspace contractors will seal off the area from outside air as much as possible. 

Once the space has been isolated from the outside, they will install a dehumidifier to remove any extra humidity and to maintain the proper humidity level in the future.

To seal off the space, all vents in basements and crawl spaces must be sealed. Crawl space doors and entrances should create an airtight seal when closed to keep out outside air.

Moisture can also pass continually through the porous concrete, mortar, or dirt, entering a basement or crawl space straight through the walls and floors. 

Along with the moisture, water brings a white, powdery mineral salt called efflorescence. 

If you seal the walls with a paint, this salt will build up behind the seal, causing it to blister and peel. Instead, mechanically fasten a sheet of plastic - at least 25 mil in thickness - to the walls. This will keep moisture out of the space, helping you fight mold and moisture damage in the home.

A dehumidifier is a great idea as well. Be sure to pick one that is self-draining, powerful enough for the entire space, and is Energy Star rated to keep your utility bills low while protecting your investment.

Dry Below-Grade Spaces

There's only one good way to keep your crawl space dry: seal the space and install a dehumidifier. If you're interested in taking your crawlspace to the next step, CleanSpace of Mississippi would like to help you. 

We offer FREE wet crawl space estimates in areas like Jackson, Vicksburg, Greenwood, Greenville, Laurel and Lexington. Call or contact us online today to get started!