Home Exterior Inspection Checklist for Concrete, WA (Skagit County)

Updated August 2026 · Alpine Exteriors · WA contractor license ALPINI751OW

Concrete sits where the Skagit Valley starts climbing into the North Cascades foothills, and that location changes what your home's exterior has to survive compared to a house down in Mount Vernon or Burlington. You're closer to Baker Lake and the mountains, which means more rain overall, a longer wet season, shaded tree cover that keeps roofs and siding damp for days after a storm, and occasional snow and ice events that the valley floor rarely sees. None of this is dramatic weather by national standards, but it's persistent, and persistent moisture and freeze-thaw cycling are exactly what wear down a roof, a set of gutters, or a deck over the years. A regular walk-around inspection catches small problems while they're still cheap to fix.

Why This Checklist Matters in This Region

Homes around Concrete deal with a specific combination of conditions that a generic national maintenance checklist doesn't address. Rainfall here is heavier and more sustained than on the drier east side of the state, and many lots are ringed by fir and cedar trees that shade roof sections for most of the day. Shaded, damp roofing is where moss and algae take hold, and moss holds water against shingles and roof decking long after the rest of the roof has dried. Add in wind that funnels down the Skagit River valley and off the flats toward the Sound, and you get enough gusty weather to work loose flashing, siding panels and fence sections over a season or two. In colder snaps, Concrete's elevation and proximity to the foothills mean occasional snow load and ice that the lowland cities mostly avoid, which stresses gutters, eaves and older roof framing in ways flat-valley homes don't experience. None of this is hurricane- or wildfire-grade risk — it's the slow, cumulative kind that shows up as a soft spot on the deck, a stained ceiling, or a window that suddenly won't seal. Washington's building and energy codes, including the Washington State Energy Code for insulation and air sealing, assume an exterior envelope that's actually intact; gaps, rot, or failed flashing undercut both the comfort and the efficiency the code was written to deliver. Two inspections a year — one in early fall before the wet season sets in, one in spring after it lets up — is a reasonable rhythm for most homes in this area, with a quick check after any significant windstorm or heavy snow.

The Checklist

Roof

• Moss or algae streaks on shaded slopes — moss holds moisture against shingles and can lift edges, shortening the life of the roofing underneath it.
• Missing, cracked, or curling shingles — even a few damaged shingles let wind-driven rain track sideways under the roofing layer.
• Granules collecting in gutters — heavy granule loss signals the shingles are aging and losing their protective surface faster than expected.
• Flashing around chimneys, skylights, and roof-to-wall joints — these transitions are the most common source of slow leaks after a wet winter.
• Sagging or uneven roof lines — can point to moisture-weakened decking or, after a snow event, stress on the framing.
• Overhanging or touching tree limbs — branches that brush the roof keep it shaded and damp and can also scrape shingles bare in wind.

Gutters and Downspouts

• Leaves, needles, and moss clumps in the gutter run — the biggest single cause of overflow and ice damming during a cold snap.
• Sagging gutter sections or pulled-away brackets — usually the result of standing water weight or ice, and it gets worse each season if ignored.
• Downspouts that dump water right at the foundation — with this much annual rainfall, that water needs to travel several feet away, not pool at the base of the house.
• Rust streaks or peeling paint on gutter seams — an early sign of a slow leak at a joint that will only widen.

Windows and Trim

• Soft or discolored wood trim around window frames — a sign moisture is getting behind the trim, often invisible until it's advanced.
• Failed or foggy double-pane glass — condensation between panes means the seal is gone and the window is no longer performing to the insulation values assumed under the Washington State Energy Code.
• Cracked or missing caulk at window edges — a fast, low-cost fix that prevents a much bigger repair down the line.
• Drafts felt around the frame on a windy day — with wind coming steadily off the valley and the flats, a drafty window is both a comfort and a heating-bill problem.

Siding and Exterior Walls

• Bubbling, peeling, or discolored paint — almost always a moisture signal, not just a cosmetic one.
• Cracked, warped, or missing siding panels — gaps here let wind-driven rain reach the sheathing behind the siding.
• Dark green or black staining on north-facing or shaded walls — algae growth that thrives in the damp, low-sun conditions common on tree-shaded lots.
• Gaps where siding meets trim, corners, or the foundation — small openings that widen over time and give moisture and pests an entry point.

Decks and Outdoor Structures

• Soft, spongy, or splintering deck boards — a clear sign of rot from repeated wetting, especially on boards that don't get much sun.
• Rust or looseness at structural connectors and ledger boards — the ledger board attachment is a known failure point on older decks and deserves a close look.
• Railings that flex or wobble — a safety issue as much as a maintenance one, and worth checking every season.
• Standing water or debris buildup between boards — trapped moisture accelerates rot even on treated lumber.

Foundation and Drainage

• Water pooling near the foundation after rain — with heavy seasonal rainfall, poor grading here can lead to basement or crawlspace moisture.
• Cracks in the foundation wall wider than a pencil — worth monitoring for growth over a season, particularly after a freeze-thaw stretch.
• Efflorescence (white, chalky residue) on foundation walls — a sign water is moving through the concrete or masonry.
• Musty smell or visible mold in the crawlspace — a downstream symptom of drainage or ventilation problems above.

What to Do If an Item Fails

Not every item on this list demands an emergency call. A few missing granules in the gutter or a light dusting of moss on a north-facing roof slope is normal wear that's worth noting and re-checking next season rather than reacting to immediately. The general rule: if the issue is cosmetic and isolated, document it with a photo and a date, then re-inspect at the next seasonal walk-around to see whether it's stable or spreading. If the issue involves water actively reaching wood, insulation, or the home's structure — a soft deck board, a leaking flashing joint, a window seal that's failed, or standing water at the foundation — treat it as active and address it before the next heavy rain, not after. Delaying repairs on moisture intrusion in this climate tends to compound quickly, since the wet season rarely gives an exterior repair time to dry out and stabilize on its own. For anything involving the roof surface, structural framing, or electrical near a wet area, don't attempt a DIY fix from a ladder in wet or windy conditions — the risk of a fall outweighs the savings, and a rushed patch job often needs to be redone properly anyway.

When to Call a Professional

Some items on this checklist are reasonable for a homeowner to handle directly — clearing debris from gutters on a dry, calm day, re-caulking a window edge, or trimming back a branch that's brushing the roofline. Others are worth bringing in a licensed contractor for, either because of the height and fall risk involved or because diagnosing the real cause takes experience. If you see recurring moss regrowth despite cleaning, staining that keeps reappearing on an interior ceiling or wall, a deck ledger board with any looseness, multiple foggy windows, or foundation cracks that seem to be widening, it's worth having a professional take a closer look rather than guessing at the cause. Alpine Exteriors works throughout Skagit, Island, and Whatcom counties, including Concrete, Mount Vernon, Sedro-Woolley, and the surrounding foothills communities, and can walk a property, point out what's cosmetic versus what needs attention, and give a straightforward assessment before anything turns into a bigger repair. As a Washington-licensed contractor (license ALPINI751OW), Alpine Exteriors can also speak to how a given repair interacts with Washington State Energy Code requirements when insulation, air sealing, or window replacement is part of the picture.

FAQ

How often should I inspect my home's exterior in Concrete?

Twice a year is a reasonable baseline for most homes in this area — once in early fall before the heaviest rain arrives, and once in spring once the wet season has eased. It's also worth doing a quick visual check after any significant windstorm or a snow and ice event, since those are the conditions most likely to loosen flashing, snap branches onto the roof, or stress gutters beyond what a routine season would.

Why does moss keep coming back on my roof even after I clean it off?

Moss regrows on roof sections that stay shaded and damp for long stretches, which is common on lots surrounded by fir and cedar trees. Cleaning removes the visible growth but doesn't change the underlying shade and moisture conditions, so moss will typically return unless tree limbs are trimmed back to let more light and air reach that part of the roof, or unless a longer-term moss-control approach is used alongside regular cleaning.

Is it normal to see some window condensation in winter?

Condensation on the inside surface of a single pane during cold snaps is common and generally not a sign of a problem — it's a function of indoor humidity meeting a cold glass surface. Condensation that shows up between two panes of a double-pane window is different: that means the seal has failed and the insulating gas or air gap is compromised, which reduces the window's performance and is worth having assessed rather than just wiped away.

Do older homes in Concrete need different exterior maintenance than newer ones?

Often, yes. Older homes may have original wood trim, single-pane or early double-pane windows, and roofing or siding materials that predate current energy code expectations, so they tend to show moisture-related wear sooner and need closer, more frequent checks at trim, window frames, and foundation areas. Newer builds under the current Washington State Energy Code generally have tighter envelopes and more moisture-resistant detailing, but they still need the same seasonal attention to gutters, roofing, and drainage — no exterior is maintenance-free in this climate.

Get a Professional Look Before the Wet Season Sets In

A short seasonal walk-around catches most exterior issues while they're still simple, inexpensive fixes. If anything on this checklist looks uncertain, or if it's been a while since your roof, gutters, siding, windows, or deck had a real look-over, Alpine Exteriors offers exterior assessments for homeowners throughout Concrete and the rest of Skagit, Island, and Whatcom counties. Reach out to schedule a walk-around before the next round of fall rain arrives.