I posted this on another forum but I didn't get much of a response, so I'm hoping some of the pro's can help me or point me in the right direction.
On some of my rafter in the attic i have a white grainy substance on them. It started to happen after I boxed in my soffits about three months ago. I didn't use large enough vents to allow enough air to vent back into the attic. I have taken down the plywood that I used to box in the soffits and allowed normal air flow back in.
I did spray some of the boards with Tilex and them some Concrobium for mold and nothing happen.
I had an Insulation guy out today for an estimate for spray insulation. He said he wasn't sure what it could be but it doesn't look like mold.
I was thinking if my attic could have gotten to hot and some of the boards started to leak some of the sap or chemicals. Just a thought.
I would post an image but I don't have enough post counts to do so.