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A roof rarely fails all at once. In Western Washington, persistent rain, wind-driven debris, moss growth, and damp shade can turn a small shingle issue into a leak long before water appears on a ceiling. Knowing how to inspect roof shingles helps you spot warning signs early, protect your home, and make a better decision about whether a repair or professional evaluation is needed.
A homeowner inspection should be careful and limited. The goal is not to climb onto a steep, wet, or aging roof. It is to understand what you can safely see from the ground, around the property, and inside the attic so that problems do not go unnoticed.
Choose a dry day with good daylight. Avoid inspections during rain, frost, high winds, or immediately after a storm, when surfaces can be slippery and loose debris may still be moving. In the Puget Sound region, waiting for a clear break in the weather can make it much easier to see shingle condition accurately.
Begin from the ground. Walk slowly around the house and look at each visible roof slope from several angles. Binoculars can help you see the field of the roof without stepping on it. A phone camera with zoom can also be useful for documenting an area that appears damaged.
Do not walk on shingles unless you have the proper training, safety equipment, and a roof designed for safe access. Foot traffic can scuff granules, crack brittle shingles, or disturb seals, particularly on an older roof or during cold weather. A ladder can be helpful for viewing lower roof edges, but it should be placed on level ground and used only if you are comfortable doing so safely. Never lean a ladder directly against gutters.
Look first at the roof as a whole. A healthy shingle roof generally has an even, consistent appearance. It will not look perfectly uniform from every angle, but pronounced dips, waves, dark patches, or areas that sit lower than the surrounding roof deserve closer attention.
Pay special attention to the lower edges, ridgelines, hips, valleys, and the areas around chimneys, skylights, vents, and walls. These transitions depend on flashing and careful installation details to direct water away. Shingles may be in good condition while a problem at one of these vulnerable areas allows water underneath them.
As you scan the roof, watch for these visible signs:
One missing tab after a windstorm may be a contained repair. Multiple lifted or missing shingles across several slopes can point to broader wind damage, weakened seals, or shingles nearing the end of their service life. The location matters as much as the visible symptom.
Granule loss also calls for context. A small amount of loose granules is common, especially on a newer roof, because some material can shed after installation. Large accumulations or shingles that look smooth, patchy, or visibly worn are different. Granules protect the asphalt layer from sunlight and weather exposure, so substantial loss can shorten the roof’s useful life.
Moss is common on roofs throughout King, Pierce, and Snohomish Counties, especially beneath trees and on north-facing slopes. It should not be ignored, but it should not be treated with aggressive cleaning methods either. Moss holds moisture against the roof surface and can work its way beneath shingle edges, where it interferes with drainage and accelerates wear.
Look for moss concentrated along shingle edges, in valleys, behind chimneys, and under overhanging branches. Also note piles of needles, leaves, and small branches. Debris can create a dam that holds water in areas intended to shed it. Valleys are especially important because they carry runoff from multiple roof planes.
Avoid pressure washing a shingle roof. High-pressure water can remove protective granules, break shingle seals, and force water beneath the roofing system. Scraping with hard tools can cause similar damage. Appropriate moss treatment depends on the roof’s age, pitch, material, and condition, so this is often best handled by a qualified roofing professional.
While you are outside, inspect the gutters as part of the same process. Gutters that overflow, pull away from the fascia, or remain packed with debris can send water where it does not belong. Clean, properly pitched gutters and clear downspouts help preserve the roof edge, fascia boards, and foundation drainage.
The underside of the roof often reveals problems that are not yet obvious outside. On a dry day, use a flashlight to inspect the attic or accessible upper crawlspace. Step only on framing or a properly supported walkway, never directly on ceiling drywall or insulation.
Look for water staining, darkened plywood, damp insulation, rusty nail tips, mold-like spotting, or an earthy odor. Daylight visible through roof decking or around penetrations requires prompt attention. A stain does not always mean there is an active leak today, but it does mean water entered at some point and the source should be identified.
Ventilation deserves a close look as well. Condensation from poor attic ventilation can resemble a roof leak. If moisture appears broadly across the underside of the roof deck rather than in one concentrated location, humidity and ventilation may be contributing factors. A professional inspection can distinguish between a flashing leak, a roofing failure, and an attic moisture issue before unnecessary work is recommended.
A quick ground-level inspection is worthwhile after a significant wind event, a period of heavy rainfall, or a large branch impact. Look for shingles or pieces of flashing on the ground, granules near downspouts, and newly exposed areas on the roof. Inside, check ceilings near exterior walls, skylights, and chimneys for fresh discoloration.
Do not assume a roof is fine because no water is dripping indoors. Many leaks begin slowly and wet the roof deck or insulation before they reach finished living spaces. Catching them at this stage can prevent damage to framing, drywall, paint, and electrical components.
If you find a possible issue, take clear photos from a safe location and note when you first noticed it. Avoid covering the roof with a tarp unless it can be done without risk. An improperly installed tarp can create more damage by trapping water or pulling loose shingles.
A professional evaluation is the right next step when shingles are missing or curling, roof surfaces appear sagged, moss is extensive, attic moisture is present, or you see staining near a ceiling or skylight. It is also wise when the roof is approaching the expected age of its material and you are planning to sell, refinance, install solar, or make other major improvements.
Roofing decisions should be based on the full system, not a quick look at the shingle surface. Underlayment, flashing, ventilation, decking, penetrations, gutters, and previous repairs all affect watertight performance. A qualified roofer can determine whether a focused repair will provide reliable protection or whether replacement is the better long-term investment.
For homeowners who want a clear assessment of a roof exposed to Western Washington weather, Hillside Roofing can inspect the system with the same care used on every installation. The purpose of a good inspection is to give you an honest picture of your roof’s condition and the work, if any, that will protect your home.
A few careful observations after each season can make a meaningful difference. When a small change on the roof is addressed before the next stretch of heavy rain, the repair is often simpler, cleaner, and far less disruptive to the home below.
