Wood rot, termite damage, and structural decay are common problems in Spokane homes, especially in the older neighborhoods where Craftsman bungalows, Queen Anne mansions, and Arts and Crafts homes dominate the South Hill, Browne's Addition, and Cannon Hill. The region's freeze-thaw cycles, heavy snowmelt, ice dams, and the shading of tall ponderosa pines create ideal conditions for fungal decay in fascia, soffits, sills, and porch decks, while carpenter ants and other wood-boring insects exploit the same damp framing that rot attacks. This guide explains what you are looking at when decay appears, how to tell repair from replacement, and how the work divides among the professionals you will need.
Whether you have found soft wood in a deck ledger, discovered termite damage in a pest inspection, or noticed a floor that feels bouncy or out of level, the information here will help you understand the problem, ask the right questions, and make an informed decision about repair. This is not a sales guide; it is written to tell you what a responsible contractor would tell you, including the things that do not require immediate action and the cases where repair honestly works better than replacement.
Dry Rot and Wet Rot: Not the Same Problem
Dry rot and wet rot are both fungal decay, but they behave differently and require different solutions. Dry rot, despite its name, needs sustained moisture to thrive; it does not require standing water or constant dripping, but rather the kind of persistent dampness that Spokane's snowmelt, ice dams, and freeze-thaw cycles create in fascia, soffits, and sill plates. Once established, dry rot spreads through wood along the grain and can even travel across masonry to reach new timber, making it the more aggressive of the two. Wet rot, by contrast, requires a direct and ongoing water source, a gutter leak, a plumbing failure, or persistent condensation, and it stays localized to that source. The difference matters because dry rot can spread to framing you cannot see, while wet rot signals its presence more obviously by staying put.
The two also look and feel different. Dry rot produces cubical cracking and a dry, crumbly texture that crumbles easily between your fingers; the wood loses its structural integrity from the inside while the surface may appear deceptively sound. Wet rot darkens the wood and makes it spongy or soft, almost waterlogged, and it tends to feel heavier and wetter to the touch. The confusing part is that paint can look perfectly intact over either one. A paint film may blister or hold moisture at the surface, or it may appear fine while decay advances underneath. This is why a screwdriver probe or a tap with a hammer is the only reliable way to know what is actually happening in the wood; surface appearance alone will mislead you more often than it helps.
Termite and Beetle Damage, and How It Differs from Rot
Termites and wood-boring beetles cause structural damage that looks and behaves differently from fungal rot, though the two often occur together in the same wood. Termites hollow out wood along the grain, eating from the inside and often leaving a thin, papery shell of sound-looking surface wood behind. They frequently build mud tubes on masonry or concrete to travel from soil to timber, and these tubes are often the first visible sign of an infestation. Wood-boring beetles, by contrast, leave exit holes (small round or oval holes in the surface) and frass, which is fine, sawdust-like debris that accumulates below the holes. The damage pattern is different too: beetles tunnel perpendicular to the grain, creating a honeycombed interior, while termites follow the grain and can consume large sections of a beam or joist while leaving the outer shell nearly intact.
Insect damage and rot frequently appear in the same piece of wood because the conditions that invite one, sustained moisture, poor ventilation, and wood-to-soil contact, invite the other. A sill plate that is damp from snow melt may host both carpenter ants and dry rot fungus simultaneously. Identifying which insects are present and treating them is the work of a pest control operator licensed or registered in your state, not a carpenter. Once a pest inspection report is in hand, the carpenter removes and replaces the damaged wood and addresses the moisture source that allowed the problem to start. The two trades work from the same problem but with different tools and expertise; neither one does the other's work.
Reading the Signs Before You Open Anything Up
Before you call anyone or open up a wall, there are several signs you can observe that point to decay or insect damage. Look for paint that blisters, peels, or seems to hold moisture at window sills, door thresholds, and the base of exterior trim; this often means water is trapped behind the paint film and decay is starting underneath. Press on trim, fascia, and soffit with a screwdriver or your thumb; sound wood resists, while decayed wood gives under gentle pressure or allows the screwdriver to sink in. Check exterior doors and windows to see if they have become harder to open or close, or if their frames have shifted; this can signal that the sill or jamb is losing section to rot. Inside the house, walk across floors and feel for soft or springy spots, or notice if the floor feels noticeably out of level; a floor joist or subfloor losing section will announce itself this way before anything else. Deck boards that flex more than they used to, or that feel spongy underfoot, deserve a close look at the ledger where the deck connects to the house. A musty or moldy smell in a basement, crawlspace, or enclosed porch suggests persistent moisture and the conditions under which decay thrives.
None of these signs means you should panic or assume the worst. They mean you should have someone probe the wood and measure the extent of the damage. The critical thing to understand is that surface appearance almost always understates how much decay is present. A sill plate may look only slightly soft on the outside but be hollowed out several inches deep. A joist may have a small soft spot on top but be sound below. Probing with a screwdriver or an awl is how the actual extent gets determined, and that is why a contractor's first step is almost always to open things up enough to see what is really there. Do not assume that visible decay means the whole member must be replaced; extent and location determine whether repair is possible.
What Decay Does to a Floor, a Deck and a Wall
Understanding what each structural member does helps you understand what happens when it decays. A floor system has several parts working together: the floor joists run from wall to wall and carry the weight of the floor and everything on it; the subfloor is nailed to the top of the joists and distributes that load; the sill plate sits on the foundation wall and transfers the load from the joists down to the foundation; and the rim joist closes the end of the joist cavity and helps tie the system together. When a joist loses section to rot, it becomes less stiff and less able to carry that distributed load. What you feel first is bounce or flex in the floor, especially in the middle of the room or when you walk in a particular spot. This is loss of stiffness, and it happens long before the joist is anywhere near failure. A deck system works similarly: the ledger is the board bolted to the house that carries the deck's weight, and it is connected through the house rim joist to the main structure. A sill plate or rim joist losing section means the house frame is losing its connection to the foundation. A deck ledger losing section means the deck is losing its primary connection to the house, which is the one that matters most.
The progression is gradual and measurable. A small area of rot in a non-critical location may be present for years with little effect on how the floor feels. As the decayed section grows, the bounce increases and becomes noticeable. If decay reaches a bearing point (where the joist sits on the sill plate or rim joist), the load path is compromised and the repair becomes more urgent. The key point is that you will feel the problem before it becomes dangerous; the floor tells you what is happening through its stiffness long before structural failure is anywhere on the horizon. This is why a bouncy floor or a soft spot in a deck is worth investigating promptly, but it is not an emergency. It is a signal to have the wood examined, measured, and quoted for repair.
Repair or Replace: The Actual Criteria
Deciding whether to repair or replace a decayed member comes down to four questions: how much sound wood is left, where the decay is located, whether the water source can be closed, and what the two options cost when access is included. A joist that has lost 30 percent of its section to rot in the middle of the span, with sound wood at both bearing points, is often a good candidate for sistering, which means bolting a new joist alongside the damaged one to share the load. The old joist stays in place, the new one carries the structural load, and the system is restored. A joist that is decayed at both bearing points, or that has lost more than half its section, is usually better replaced. A sill plate that is sound except for a 2-foot section under a window may be repaired by cutting out the bad section and splicing in new wood; a sill plate that is soft across a 10-foot run is more economical to replace. The location matters because decay at a bearing point (where the joist sits on the sill, or where the deck ledger bolts to the house rim) is structural and less forgiving than decay in the middle of the span.
Water source closure is equally important. If the decay came from a leaking gutter, a failed soffit, or ice dams backing up under the fascia, and that source cannot be closed, any repair you make will simply decay again. This is why a responsible contractor looks at both the damage and what caused it. Epoxy consolidants and wood fillers have a real but narrow use: they can stabilize a non-structural piece of profiled trim, like crown molding or decorative casing, that is worth saving for its craftsmanship or finish. Filler or epoxy over structural rot is not a repair; it is a Band-Aid that will fail. A good contractor will quote you both repair and replacement where both are honestly possible, explain the trade-offs, and let you choose. Sometimes repair is the better answer. Sometimes replacement is. The worst outcome is a contractor who recommends replacement because it is simpler or more profitable, or one who patches rot with filler because it is cheaper upfront. Ask for both options, and if you get only one answer, get a second opinion.
Who Does What: Carpenter, Pest Operator, Engineer
The work of addressing wood decay divides among several professionals, each with a specific role and expertise. A pest control operator, licensed or registered in your state, identifies wood-destroying insects and treats them. A carpenter removes decayed wood, replaces it with sound material, closes water sources, and restores the structure to function. A licensed structural engineer sizes beams, specifies repairs where the structure is compromised, and produces drawings that a building department can review. The building department in your jurisdiction issues permits, reviews plans, and inspects the work to ensure it meets code. Each of these roles protects you in a different way, and each one matters.
Spokane Carpentry is the carpenter in this lineup. We are fully insured, and we remove and replace wood damaged by rot or insects. We work from your pest inspection report if insects are involved; we do not treat insects ourselves. We close the water sources that allowed decay to start. We can help you document damage for an insurance claim. Where structural members are involved, we commonly recommend a licensed structural engineer to size a beam or specify how a load-bearing wall should be altered, and we work from those specifications. We pull permits where required and work with your building department. We are not a pest control operator, an engineer, or a building inspector; we are a local carpentry shop, and we do the work that carpenters do. If you have found decay in your Spokane home or suspect structural damage, call us for a free estimate, and we will tell you what we see and what it will cost to address it honestly.