How to Remove Roof Moss

In this video, This Old House general contractor Tom Silva explains how to remove roof moss and prevent it from coming back.

How to remove moss from a roof

1. Slide a margin trowel under shingles to unstick them from the ones below.
2. Slide sacrificial zinc strip underneath the loosened shingles.
3. Secure the strip with roofing nails.
4. Apply a dab of sealant to every nail head and run a bead of sealant under each shingle.
5. Continue installing zinc strips across length of roof, end to end, leaving a 1/8 in. space between the strips.
6. To kill existing moss and lichen, make a cleaning solution of equal parts bleach and water.
7. Protect nearby shrubs and lawn with plastic tarps.
8. Spray the cleaning solution onto the shingles using a garden sprayer.
   

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