I have a rambler house in Seattle, WA. Every 1-2 years there have been spots of mold appearing on 2 bedrooms (lower half bottom) walls facing the west (where the sun goes down) after I cleaned & wiped the walls with a bleach. I already replaced the roof and windows with double insulated glass windows (vis-a-vis single pane glass where I can see moisture dripping during winter time). Still have this problem now. It is only these 2 rooms inside the house that have a problem and not other rooms. I monitored the humidity and are in the range of 65-80. It seems always humid in these bedrooms. What may be the problem? And, how to get rid of these molds in a long term?
Bleach does not touch mould it just removes the colour.
You need to find Why the humidity ,
We need more info what direction are the rooms facing .
Is there any air movement in these rooms .
Have you tried a dehumidifier to see if it lowers the rooms .
Is there a exhaust fan in the Bathroom and is it used .
Is there an kitchen exhaust and is it used when cooking .
Do you dry clothes in the home or these rooms do you have a dryer and does it exhaust out side .
Are these rooms open all the time or is the doors closed .
These are just a few of the questions that need to be answered.
Thank you Mr. Frotte for your reply.
Where can buy/rent a Thermal imaging scan? Would a non-contact thermometer with laser targeting work?
If the Termail imaging scan is expensive to buy/rent, would you recommend someone in Seattle who can do it for me?
I talked to him for about 20 minutes and his moisture reading in the home are usually in the high sixties to low 70 %.
I told him I like to see it about 50%
My feeling with what was said most of this is caused by Crawl space vents .
I recommended a automatic Dehumidifier with hose to a floor drain .
Close C.S. vents use Bath and Kitchen fans more .
He did not have a gas stove ,Most of his moulds are in the west rooms .
Most of his wind is from the west so these rooms could be cooler .
He had some knowledge and was a very good listener .
I expect to hear from him again be interesting to see what the out come is,