black spots on the roof. can you tell me what is the cause of this? have lived in this house 12 years and have had no problems. what can you do to clean this?
This type of staining (algae as the other posters have said) will usually only happen on the North facing surface of the roof. Same with condensation on your car glass. Suprisingly, the North facing ... read more
I would encourage you to read up on SPF and if you do go that route, make sure you get a great and insured installer. SPF does have additional benefit from and air sealing standpoint but beyond the a ... read more