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Substance on walls

We put a new roof on 2 years ago. We just started to notice a sticky substance on the walls. It is really bad in the winter. Does anyone know what it is and how to stop it?

Re: Substance on walls

Can you offer more details as to your problem Mike? What walls? What part of the walls is this substance on? Describe the sticky substance? , Etc.

Re: Substance on walls

The substance is sticky almost sap looking. It turns white. The walls are exterior ones. They are the ones that form the peak of the house.

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