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Mike
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  • Girard, PA
  • United States
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Blue residue on logs after washing-Mold?
12 Replies

I recently built a garage and have installed log siding on the building to match my home.  The siding I used was sitting in a barn for over 20 years and was somewhat dirty, but otherwise ok.  I…Continue

Started this discussion. Last reply by Mike Oct 12.

Staining the back of log siding
1 Reply

I am building a garage and installing log siding on it to match my log home.  I have been told to stain the back of the siding prior to installing.  I am guessing this is to protect the back side of…Continue

Started this discussion. Last reply by CharisB Oct 19, 2017.

Window Dormer Issues

I need to replace the fascia boards on my gable window dormers. It appears they have been installed too close to the shingles and are rotting as a result. I also will need to replace a few pieces of…Continue

Started Jun 16, 2015

Removing Sikkens Cetol Film Forming Stain
10 Replies

I need to strip Sikkens Cetol Stain off one side of my house. It was last applied about 6 years ago. I have been letting it weather intentionally hoping, it would come off easier. The person who…Continue

Started this discussion. Last reply by Guild Log and Timber Jun 9, 2015.

 

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Mike replied to Mike's discussion Blue residue on logs after washing-Mold?
"Charis, Do you think the blue is mold and the black mildew? Yes I am definitely going to clean and re-do the Timbor. The wood isn’t fuzzy it’s just like that from the way it was milled 30 years ago by the Amish and is somewhat rough cut…"
Oct 12
CharisB replied to Mike's discussion Blue residue on logs after washing-Mold?
"Mike - That looks like mold/mildew to us. I had our chemist take a look, too. In addition, I'm seeing some wood fuzzing, likely caused by the combo of cleaning and rinsing. You'll want to sand that off with a 60 grit sandpaper. It'll…"
Oct 12
Mike replied to Mike's discussion Blue residue on logs after washing-Mold?
"Attached are 2 pictures of something that looks like mold. This was only on a few boards. Does this look like mold. I’m guessing I shouldn’t stain over this. I didn’t see this last night. Now I am thinking I will was with bleach,…"
Oct 12
Mike replied to Mike's discussion Blue residue on logs after washing-Mold?
"these 3 pictures are of the blueish residue. It was a lot more obvious last night but I rubbed most of it off. "
Oct 12
CharisB replied to Mike's discussion Blue residue on logs after washing-Mold?
"Another thought: if the blue was there before, it could be tannin staining. The oxalic acid would bring it to the surface and loosen it some, which would make it come off easily with a finger. Rinsing the whole wall some more, then sanding just…"
Oct 12
CharisB replied to Mike's discussion Blue residue on logs after washing-Mold?
"Well that certainly explains things a bit more. My guess is that you probably have some oxalic acid in the wood still. It might be that you just need to rinse some more. Hit up your local pool supply or hot tub supply place, or a paint store. Get a…"
Oct 12
Mike replied to Mike's discussion Blue residue on logs after washing-Mold?
"Actually now that I think of it, the other 3 sides were cleaned with sodium percarbonate and I did not have this happen. The reason I used oxalic acid was I found a container of crystals I had leftover in my garage from work on my house and thought…"
Oct 12
Mike replied to Mike's discussion Blue residue on logs after washing-Mold?
"Charis, Thanks for the advice and help. It seems like every time I ask something here you are very helpful. The blue residue was there before the borate. It’s just that I noticed it when I started to spray the borate. Now I am hesitant to…"
Oct 12
CharisB replied to Mike's discussion Blue residue on logs after washing-Mold?
"Thanks for the added details. The higher iron content in the well water might have something to do with it, too. We'll try to piece together everything we know with what you know and figure it out. Many traditional deck cleaners are also acids…"
Oct 12
Mike replied to Mike's discussion Blue residue on logs after washing-Mold?
"That’s kind of what I was wondering- if it was a chemical reaction of some kind. It seems odd that mold would form so quickly after cleaning. I would have taken pictures but I was spraying the borate at night( only time I could with young…"
Oct 12
CharisB replied to Mike's discussion Blue residue on logs after washing-Mold?
"Hi, Mike. You might be dealing w/ some chemical interactions between the two products, in combination with some loose wood fibers still being on the surface. If you can post more details about how you rinsed off the wood, if you used anything…"
Oct 12
Brian Donelson replied to Mike's discussion Blue residue on logs after washing-Mold?
"Hi Mike, If you've gone through the process of using Oxalic Acid, (which is a brightener, not really a cleaner) you've lightened the wood best you can and using bleach can lead to more damage to the woods fibers. Without seeing pictures…"
Oct 12
Mike posted a discussion

Blue residue on logs after washing-Mold?

I recently built a garage and have installed log siding on the building to match my home.  The siding I used was sitting in a barn for over 20 years and was somewhat dirty, but otherwise ok.  I recently finished the last side of the building (facing east), which is in an area that gets little sun.Since the boards only appeared to have some dirt on them from sitting all those years, I opted to clean with oxalic acid. After spraying the oxalic acid onto the siding, I let it sit for about 15…See More
Oct 12
CharisB replied to Mike's discussion Staining the back of log siding
"There are arguments both ways on this issue. Some say that staining the backside will protect the wood against rot if moisture gets behind the siding at all. Others say you'll trap too much moisture by "encapsulating" the wood on all…"
Oct 19, 2017
Mike posted a discussion

Staining the back of log siding

I am building a garage and installing log siding on it to match my log home.  I have been told to stain the back of the siding prior to installing.  I am guessing this is to protect the back side of the wood from moisture.  Is this necessary?  I plan on installing wood lath to allow a 1/4" gap between the siding and the house wrap over that is installed over the sheathing. My house is log construction but on the upper portions of the gable ends near the peak of the roof it has log siding.  I…See More
Oct 19, 2017

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