Mesquite Tree Sap – The Good, Bad & Ugly.

The Bad.  Mesquite tree sap that drips on to the roof reacts with the asphalt binders of fiberglass composition shingles, releasing the protective ceramic granuals.  And in time, holes will develop in the shingles.  Short of removing the trees – sometimes not an easy task to accomplish – it is critically important to keep them trimmed and not overhanging the …