kitchen floor mystery

We are replacing all of our downstairs flooring. Hardwood will replace carpet in the living/dining/den and either Duraceramic or sheet vinyl in the kitchen. The kitchen floor luan had delaminated in several places. To save a few dollars I have pulled up the carpet & pad and have now pulled up the old vinyl and luan in the kitchen. In the living/dining/den the subfloor was nice and clean. However in the kitchen/laundry/bath area the subfloor is covered with a white powery substance. I believe it is a mold of some type. There were also a couple of small spots that were green and I know this to be mold. However these spots were relatively small areas of about 6" in diameter. The kitchen/bath/laundry happens to be over the area of the crawl space that has a congestion of HVAC ducts etc. So ventalation under the back of the house is not as good as in the front of the house. There is no evidence of leaking toilets, sinks, dishwashers etc. The subfloor is solid and dry. Underneath the house I can't find any evidence of pipes spraying upward etc. I want to make sure that I handle any problems now before a new floor is put down.
Do you think this is mold?
If so would several moppings or sprayings of a water/bleach solution hel;p or hurt?
Would moisture be rising through the joints of the subfloor?
Should I caulk the subfloor joints?
Thanks JD
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
--WebTV-Mail-17975-6988 Content-Type: Text/Plain; Charset=US-ASCII Content-Transfer-Encoding: 7Bit
don't know if this helps but recently had the refrig leak. 1st indication was Wood floor warp about 4 feet from the frig itself...... wood flooring company came out to check the damage. They had to wait 3 months for it to dry out before doing any service to the floor. They said things need to be good and dry before sanding and sealing anything.
--WebTV-Mail-17975-6988 Content-Description: signature Content-Disposition: Inline Content-Type: Text/HTML; Charset=US-ASCII Content-Transfer-Encoding: 7Bit
<html><body bgcolor="white"text="#000000"><center><br><imgsrc="
http://bluelady.lbbhost.com/hween/webwitchkitty.jpg "><br><img src="
http://bluelady.lbbhost.com/hween/webline.jpg "><bgsound href="http://community.webtv.net/tiredlion61/MySigs "><font size="2"color="#000000"><b>Signatures By<br>The TiredLion</a></b></font><br><br></center></body></html>
--WebTV-Mail-17975-6988--
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Site Timeline

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.