DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > General Home Improvement Discussion > sweating in craawl space




Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old 05-27-2013, 11:58 AM  
dolfan
Member
 
Join Date: Dec 2012
Location: lowgap, nc
Posts: 39
Liked 2 Times on 2 Posts

Default sweating in craawl space

House has the vents opened and the water pipes side is out of the late morning /pm sun. The pipes and half of the water tank has sweat on them and places/spots of the plastic does also. Is this ok/normal if not what can I do? I have a small fan 10 or 12 inch I guess I can use sometimes when home. thanks



__________________

Last edited by dolfan; 05-29-2013 at 04:23 AM.
dolfan is offline  
 
Reply With Quote Quick reply to this message
Old 05-27-2013, 03:29 PM  
nealtw
Contractor
 
Join Date: Nov 2010
Location: vancouver, b.c.
Posts: 10,207
Liked 837 Times on 748 Posts
Likes Given: 1451

Default

The water in the tank and pipes is colder than the air. The air has high water content and when the air comes in contact with the cooler tank the air cools and the moisture in the air condences on the cooler tank and pipes.



__________________
nealtw is offline  
 
Reply With Quote Quick reply to this message
Old 05-28-2013, 08:21 AM  
drewdin
Junior Member
 
Join Date: Aug 2012
Posts: 392
Liked 26 Times on 23 Posts
Likes Given: 79

Default

I have been told that if the pipes sweat you need to insulate them, is that correct guys?

__________________
drewdin is offline  
 
Reply With Quote Quick reply to this message
Old 05-28-2013, 09:32 AM  
nealtw
Contractor
 
Join Date: Nov 2010
Location: vancouver, b.c.
Posts: 10,207
Liked 837 Times on 748 Posts
Likes Given: 1451

Default

Insulation can help but if this is indicating other problems like high humidity that may need to be addressed too. If the humidy is much higher in the basement than it is outside could indicate small leaks in plumbing somewhere in the house, perimeter drain or foundation waterproofing not doing it's job.

__________________
nealtw is offline  
 
Reply With Quote Quick reply to this message
Old 05-31-2013, 06:45 AM  
WindowsonWashington
Junior Member
 
WindowsonWashington's Avatar
 
Join Date: May 2013
Location: Washington, DC, Virginia
Posts: 198
Liked 19 Times on 18 Posts
Likes Given: 28

Default

+1

What is the vapor control layer like at the floor level? Is it sealed at the wall and piers?

Is there ductwork in the crawl?

__________________
WindowsonWashington is offline  
 
Reply With Quote Quick reply to this message
Old 05-31-2013, 05:55 PM  
dolfan
Member
 
Join Date: Dec 2012
Location: lowgap, nc
Posts: 39
Liked 2 Times on 2 Posts

Default

There is black plastic on the ground. Yes there is ductwork there and the dryer vent is close to the water tank/pipes. I have been under there with the dryer on and it is not leaking.

__________________
dolfan is offline  
 
Reply With Quote Quick reply to this message
Old 05-31-2013, 06:58 PM  
nealtw
Contractor
 
Join Date: Nov 2010
Location: vancouver, b.c.
Posts: 10,207
Liked 837 Times on 748 Posts
Likes Given: 1451

Default

The crawl space should have good cross ventulation to remove moisture.

__________________
nealtw is offline  
 
Reply With Quote Quick reply to this message
Old 06-01-2013, 07:13 AM  
WindowsonWashington
Junior Member
 
WindowsonWashington's Avatar
 
Join Date: May 2013
Location: Washington, DC, Virginia
Posts: 198
Liked 19 Times on 18 Posts
Likes Given: 28

Default

I would recommend converting the crawlspace to a conditioned type if there is already ductwork in there and the grading is good.

__________________
WindowsonWashington is offline  
nealtw Likes This 
Reply With Quote Quick reply to this message
Old 06-01-2013, 04:23 PM  
GBR
Senior Member
 
Join Date: Mar 2009
Posts: 337
Liked 18 Times on 17 Posts
Likes Given: 9

Default

I agree. If no ductwork down there, air seal all gaps/holes in the subfloor; tub drain, plumbing vent stacks, wiring holes, etc, that could add moisture from the crawlspace to the conditioned house areas, pp. 6-11; http://www.buildingscience.com/documents/reports/rr-9302-humidity-control-in-the-humid-south

Or just used some closed cell pipe insulation on the pipes and foamboard the joists to stop vapor diffusion/leaks through the wood floors. Especially if no plywood sheeting rather than solid wood deck boards; Fig.7; http://www.buildingscience.com/documents/insights/bsi-009-new-light-in-crawlspaces/

Gary

__________________
GBR is offline  
 
Reply With Quote Quick reply to this message
Old 06-02-2013, 09:51 PM  
nealtw
Contractor
 
Join Date: Nov 2010
Location: vancouver, b.c.
Posts: 10,207
Liked 837 Times on 748 Posts
Likes Given: 1451

Default

Quote:
Originally Posted by WindowsonWashington View Post
I would recommend converting the crawlspace to a conditioned type if there is already ductwork in there and the grading is good.
A few years ago we had a few people saying to close up the crawl space and I asked a few questions, as you can see, I got no answers. Perhaps you want to try.http://www.houserepairtalk.com/f109/insulating-crawl-space-10833/


__________________
nealtw is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Carpet over concrete in crawl space...venting in crawl space? Hoss Insulation and Radiant Barriers 7 12-23-2011 07:01 AM
ductwork sweating TGMcCallie HVAC 2 07-21-2011 02:32 PM
Cold water pipes sweating JeremyB Plumbing Forum 2 02-26-2011 12:27 PM
crawl space homehelp General Home Improvement Discussion 3 02-18-2011 07:48 AM
trying to fix space heater ilyaz Electrical and Wiring 1 11-29-2010 04:08 PM