My Porch Steps Keep Bleeding Sap: Help

Cause

• Pressure-treated pine, commonly used for porch and deck projects releases sap through knotholes in the wood. Other species of wood such as cedar may release sap as well. This naturally occurring substance may bleed out of young wood long after it has been cut and dried. As the outdoor temperature rises, sap warmed by the sun expands and seeps out through cracks in the wood.

Sap Removal

• Sap can be removed from the surface of the porch by scraping it off with a stiff brush or by wiping down the wood with denatured alcohol or mineral spirits. If the problem is recurring, properly sealing the wood is the most effective solution.

Sealing

• Coat the porch with a clear shellac primer, paying particular attention to cracks and knotholes. Or coat only the knots and cracks with the primer. Allow the shellac to dry for at least 30 minutes and paint on a second coat. Follow up the shellac treatment with high-quality porch paint, if desired.

Other Solutions

• Covering the porch protects the wood, as well as the home's occupants from the sun's harsh rays. Sap is less likely to be released if the porch is under cover of a roof or even several shady trees, particularly if your home has southern exposure. For a quick fix, drill a few small holes under the porch steps if possible to direct the sap downward rather than having it settle on top of your steps.