Gutter & Valley Cleanout
Valleys carry more water than any other part of the roof, and the debris that settles in them stays wet for days. The contractor clears valleys and the roof surface by hand or with a blower, scoops the gutters, flushes the downspouts, and checks that water drains away from the foundation. Overflowing gutters can push water behind the drip edge and soften fascia boards over time.
ValleysDownspoutsFascia
Moss & Algae Soft Wash
A soft wash uses a diluted cleaning solution applied at garden-hose pressure, then lets it work instead of blasting the surface. Heavy moss is brushed off gently once it dies back. Landscaping gets wetted down and covered so runoff does not burn plants. Results on algae streaks often show over a few weeks of rain, not the same day.
Soft washGloeocapsa magmaNo pressure washing
Zinc or Copper Strips
To slow regrowth, a contractor can run a zinc or copper strip along each slope just under the ridge cap. Rain washes a small amount of metal ions down the roof, which discourages algae and moss. The effect weakens on long slopes, and they work better at prevention than at killing established moss. Algae-resistant shingles use a similar idea with copper-coated granules.
Zinc stripsCopperRegrowth control
Flashing & Fastener Resealing
The factory-fresh sealant over exposed nails, vent flanges and counterflashing usually fails years before the shingles around it. The contractor scrapes off cracked old caulk, reseals with a roofing-grade sealant, resets backed-out nails, and replaces neoprene pipe boots that have split. Cracked boots are one of the most common sources of slow attic leaks.
Pipe bootsCounterflashingExposed nails
Limb Trimming & Attic Checks
Branches that rub on the roof grind granules off, drop debris, give squirrels a ramp, and keep the surface shaded and damp. Many roofers trim small limbs back from the roofline and recommend an arborist for larger ones. In the attic, they look for blocked soffit vents, bath fans dumping humid air into the attic instead of outside, and frost or mildew on the sheathing.
Tree clearanceSoffit ventsBath fans
Maintenance Plans & Commercial Drains
Some contractors offer a yearly or twice-yearly maintenance plan with set visits, a photo report and a running list of items to watch. On low-slope commercial roofs, plans focus on clearing drains, scuppers and gutters so water does not pond, and on checking seams around rooftop units. Terms and pricing are set by the contractor, so read the plan agreement before signing.
Spring & fallRoof drainsCondition reports