Go Back   EcoRenovator > Off Topic > The Billiards Room
Advanced Search

Blog Register 60+ Home Energy Saving Tips Recent Posts Search Today's Posts Mark Forums Read

Thread Tools Display Modes
Old 12-23-19, 11:40 PM   #1
Lurking Renovator
Rachael_B's Avatar
Join Date: Dec 2019
Location: Miami
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default Mold

Hi, I discovered there's mold behind wallpapers in my house. So I thought someone could help me what may be the cause? Humidity or air quality? That's spores so an air purifier should help, right?

Rachael_B is offline   Reply With Quote
Old 12-25-19, 06:22 PM   #2
Apprentice EcoRenovator
Join Date: Apr 2012
Location: Phillips, WI
Posts: 102
Thanks: 7
Thanked 25 Times in 21 Posts

Mold spores are everywhere. They grow into a problem when there is moisture and something to eat, such as wood or the paper facing of drywall.

Vinyl wallpaper is a vapor barrier, and is on the cold side of the wall. When the inside temperature is below the outside dew point, moisture can condense under the wallpaper. The result is mold.

Eliminating the mold first requires eliminating the conditions that cause mold. The easiest and cheapest solution is to raise the inside temperature to the highest temperature at which you are comfortable. In our house, that's 78 to 80 deg F. If the house gets too humid because the air conditioner is not running enough to remove humidity, put in a dehumidifier. We use a 50 pint dehumidifier located in the far end of the house that does the job very nicely.

Another option is to remove all wallpaper, and paint the drywall with a moisture permeable paint.

If you really need the house cold inside, say less than 75 deg F, then you can add insulation along with a vapor barrier on the warm side (the outside). This will both reduce AC costs and make the house more comfortable. It may also require you to reduce the size of the AC and add a dehumidifier.

Adding 3" or 4" of closed cell foam insulation to the walls and ceiling will allow you to raise the inside temperature on hot days by several degrees for the same comfort because you will not have hot walls radiating heat at you.

If you want to study up on this subject, there is lots of good reading at:

JRMichler is offline   Reply With Quote
The Following User Says Thank You to JRMichler For This Useful Post:
ME_Andy (12-26-19)

Thread Tools
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

Forum Jump

All times are GMT -5. The time now is 08:03 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Ad Management by RedTyger
Inactive Reminders By Icora Web Design