crawl space ventilation change


  #1  
Old 10-24-15, 11:42 AM
S
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crawl space ventilation change

we're working on some condo buildings' crawl spaces to jack up sinking structures,,, the engineer's leaning towards opening the original vents which have been sealed for about 10yrs,,, think we're seeing a change in opinion about this issue,,, we've suggested air exchangers & its been well received,,, in another 10yrs, the thinking will probably reverse again
 
  #2  
Old 10-24-15, 01:09 PM
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SC is a difficult place to introduce warm humid air into a crawlspace. The perception of cs vents in the south is to open them for freah air in the summer and close them to keep out the cold in the winter. Unfortunately, in many cases that is backwards. Open the vents in the winter because the air is dryer and close them in the summer because the air is humid.

If a building uses both heat and ac, IMO, it would still be best to insulate and encapsulate the crawlspace, control all of the moisture sources, and condition that space right along with the rest of the building.

Photo #5 in this link has always looked to me like the ideal cs.
New Light in Crawlspaces | Building Science Corporation

Bud
 
  #3  
Old 10-24-15, 01:35 PM
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the condo bldgs are in atl - forgot to change profile - sorry !

your replay does seem cogent - thanks !
 
 

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