Cottage Exterior Wood Care: Pressure Washing and Staining Decks and Log Siding
A cottage deck needs a clean-and-reseal cycle every 2 to 3 years, and log or vertical wood siding every 3 to 5 years. The job is always the same order: soft wash the wood, and we mean soft wash, not a 4000 PSI blast that furs the grain, let it dry for at least 48 hours, then stain. Do it in that order, at the right pressure, in the right weather, and the wood on your cottage lasts decades. Rush it and you trap moisture or scar the boards.
Why Exterior Wood Care Matters More at a Georgian Bay Cottage
Wood at a Georgian Bay cottage takes a beating that a suburban deck in the city never sees. The decks and log homes we maintain in Collingwood, Craigleith, and Thornbury all age faster on the side that faces the water, and there are four reasons for it.
First, UV. Sunlight bouncing off Nottawasaga Bay effectively doubles the ultraviolet load on a lakeside deck or a west wall. UV breaks down the lignin that holds wood fibres together, which is what turns untreated cedar that silvery grey. Second, freeze and thaw. Water works into the grain, freezes, expands, and lifts the fibres, cycle after cycle through a Blue Mountains winter. Third, ice and lake humidity. Cottages near the shoreline sit in damp air for months, and damp wood is what algae and rot want. Fourth, spring pollen and algae. By the time you open the cottage in May, a north-facing deck in Wasaga Beach can already be green and grey with a season of organic growth that greys the wood fast if you leave it.
None of this is a reason to panic. It is a reason to stay on a cycle. Wood that is cleaned and re-sealed on schedule shrugs all of this off. Wood that gets ignored for six or seven years is often past the point where a clean-and-coat fixes it, and by then you are looking at board replacement instead of maintenance.
Pressure Washing Done Right (and the Way That Wrecks Wood)
The single most common way people damage their own deck is with a pressure washer. Rented machines push 3000 to 4000 PSI, and on soft wood that is a weapon, not a cleaning tool. The goal is not brute force. The goal is to lift dirt, algae, and the worn top layer of old finish without carving into the grain underneath.
Pressure Washing vs Soft Washing
Soft washing means low pressure plus the right cleaning solution doing the work chemically instead of mechanically. We soft-wash and stain almost everything, because on cedar, pine, and pressure-treated lumber the cleaner lifts the algae and grey while the low pressure just rinses it away. Straight high pressure with no cleaner forces you to get too close and too aggressive, and that is exactly when the damage happens.
Recommended Pressures and Technique
For softwood decks (cedar, pine, pressure-treated) stay in the 500 to 1200 PSI range. Dense hardwoods like ipe can take up to roughly 1500 PSI. Use a wide 25 to 40 degree fan tip, never a narrow 0 or 15 degree tip, keep the tip constantly moving with the grain, and hold it at least 12 inches off the wood. Feather your passes so you do not leave a hard line where one stroke stopped and the next started. If you can see the wood fibres standing up and getting fuzzy behind the wand, you are too close or too high on pressure. Back off immediately.
When Cleaner Beats Pressure
For grey, weathered, or algae-covered wood, an oxygenated or percarbonate deck cleaner does more than any amount of pressure. You apply it, let it dwell for the time on the label, agitate with a stiff brush on the bad spots, then rinse at low pressure. Percarbonate brightens the wood back toward its natural tone and does it without furring the grain. For black spot and heavy algae, a dedicated deck cleaner with a mild bleaching agent clears the organic staining that pressure alone just smears around. In our experience, 80 percent of a good result is the cleaner and the dwell time, and only 20 percent is the wand.
The Number One Mistake: Too Much Pressure on Softwood
If you take one thing from this article, take this. Too much pressure on cedar or pressure-treated wood permanently furs the grain. Once those fibres lift and tear, they never lie back down. The wood drinks water faster, holds dirt, greys quicker, and the whole surface ages years ahead of schedule. There is no fix short of heavy sanding or board replacement. A furred deck is almost always a deck someone blasted at 3000 PSI to save an afternoon. Keep softwood at 500 to 1200 PSI and let the cleaner carry the load.
The Dry-Out Window: Do Not Skip It
This is where the schedule breaks for most people. After you wash the wood, it is saturated, and stain will not bond to wet wood. The fibres need to reach under about 15 percent moisture before they will accept a finish, which in practice means at least 48 hours of dry weather after the wash, and more if the air off the bay has been humid.
Stain applied to damp wood cannot penetrate, so it sits on the surface, dries unevenly and blotchy, and lifts within a season. That is a wasted weekend and a wasted can of stain. If you do not have a moisture meter, the reliable move is to wash one weekend and stain the next, assuming two or three dry days in between. We plan our Collingwood and Thornbury jobs exactly this way: a wash visit, then a separate stain visit once the boards have dried out.
Staining and Sealing: Choosing the Right Finish
Once the wood is clean and dry, the finish you choose decides how long the result lasts and how the next re-coat will go. There are three broad categories, and they trade UV protection against maintenance effort.
Clear vs Semi-Transparent vs Solid
A clear sealer shows off the natural wood and repels water, but it carries almost no pigment, and pigment is what blocks UV. Clear finishes need re-doing most often. A semi-transparent stain adds pigment while still showing the grain, which is the sweet spot for most cottage decks. It penetrates, it fades rather than peels as it wears, and that makes the next re-coat a simple clean-and-recoat. A solid stain is essentially an opaque coating. It gives the best UV protection and hides grey, tired wood, but it films on the surface and eventually peels, which means scraping and sanding when it fails.
Oil-Based Penetrating vs Water-Based Film
Oil-based penetrating stains soak into the wood and nourish it from within, which is why they wear by fading and are forgiving to re-coat. Water-based products tend to build a film on top, clean up easier, and hold colour well, but a film finish is the type that can peel if moisture gets underneath. On horizontal decks that pool water and take foot traffic, we lean toward a penetrating finish. On a protected vertical wall you have more freedom.
Reapply Intervals and the Right Conditions
Decks get re-coated every 2 to 3 years because they take sun, traffic, and standing water. Vertical log and wood siding stretches to 3 to 5 years because it sheds water and no one walks on it. When you apply, aim for 10 to 27 degrees Celsius, out of direct hot sun (hot boards flash-dry the stain before it can soak in), and never within 24 hours of rain in the forecast. Early morning or an overcast day in the right temperature band is ideal. Rushing stain onto a baking deck at noon in July is a classic way to get a blotchy finish that fails early.
Cottage Wood Maintenance Schedule
Here is the cycle we run for the cottages we maintain across southern Georgian Bay. Timing shifts a little with exposure and how close the wood sits to the water, but this is the baseline.
| Surface | Clean | Stain / Seal | Best Season |
|---|---|---|---|
| Deck | Every year | Every 2 to 3 years | Late spring to early summer |
| Log / wood siding | Every 1 to 2 years | Every 3 to 5 years | Summer |
| Fences and railings | Every year | Every 2 to 4 years | Summer |
| Dock wood | Every year | Every 1 to 2 years | Early summer, before install |
Dock wood is on the tightest cycle because it lives half in the water. If you are already pulling and re-installing your dock each season, that is the natural moment to clean and seal it while the boards are accessible and dry. We cover that timing in our dock installation and removal guide for Georgian Bay.
Log Home Specifics
Log and timber homes need everything above, plus two things a plain deck does not. The first is the chinking and caulk. Every time we work a log wall we walk the joints and check the chinking for cracks, gaps, or pull-away, because a failed joint is where water gets behind the logs and starts rot you cannot see. Re-sealing a few feet of chinking on a maintenance visit is cheap. Finding rot inside a log five years later is not.
The second is being careful about existing wood treatments. Many log homes carry a borate treatment that protects against insects and rot. We are honest that we are not entomologists, and we keep it simple: we do not strip that treatment off with an aggressive wash or an incompatible finish, and if a home has a borate history we favour a breathable penetrating product over a heavy film that could trap moisture against the logs. When in doubt on a log wall, less pressure and a breathable finish is the safe call.
We Soft-Wash and Re-Stain Cottage Wood
Our crew soft-washes and re-stains decks, siding, and docks across southern Georgian Bay. We work at safe pressures, we let the wood dry before we coat it, and we know which finish belongs on your boards. See our cottage pressure washing service.
Keep the Clean-and-Seal Cycle on Schedule
The easiest way to never let the wood grey out is to put it on a plan. Our cottage maintenance plans start at $349 per month and keep the wash-and-stain cycle on schedule so the deck and siding never fall behind. Deferring this work rarely pays off, as we lay out in the hidden costs of skipping seasonal maintenance.
Frequently Asked Questions
How often should a cottage deck be re-stained?
Plan on cleaning and re-staining a cottage deck every 2 to 3 years. Decks take direct UV, foot traffic, and standing water, so the finish wears faster than anything else on the property. Log and vertical wood siding stretches to 3 to 5 years because it sheds water and sees no foot traffic. A quick test: splash water on the boards. If it soaks in rather than beading, the finish has worn through and it is time to clean and re-coat.
What PSI is safe for pressure washing a cedar deck?
Keep softwood like cedar and pressure-treated pine in the 500 to 1200 PSI range, and dense hardwoods like ipe up to roughly 1500 PSI. Use a wide 25 to 40 degree tip, keep the tip moving, and hold it at least 12 inches off the wood. The mistake we see most often is someone renting a 3000 to 4000 PSI machine and blasting a cedar deck, which furs the grain and permanently shortens the wood's life. On soft wood, an oxygenated deck cleaner and a soft wash do more good than raw pressure.
Can I pressure wash and stain on the same day?
No. The wood has to dry before it will accept stain. After a wash, give the boards at least 48 hours of dry weather, and longer if it has been humid off the bay. The surface should read under about 15 percent moisture before you coat it. Stain applied to damp wood cannot penetrate, so it sits on top, dries blotchy, and peels within a season. Wash one weekend, stain the next.
Semi-transparent or solid stain for a cottage deck?
For a horizontal deck that takes sun and traffic, we usually reach for a semi-transparent stain. It shows the grain, penetrates rather than films, and when it wears it fades instead of peeling, so the next re-coat is a clean-and-recoat rather than a full strip. Solid stain lasts longer and hides grey, weathered wood, but it films on the surface and eventually peels, which means scraping and sanding down the road. Clear sealer looks great but offers the least UV protection and needs re-doing most often.
Do log homes need different care than a deck?
Yes. Log and timber siding is vertical, so it sheds water and lasts longer between coats, usually 3 to 5 years. But logs have two things a deck does not: chinking and caulk joints that need to be checked and re-sealed, and a higher risk of moisture getting trapped behind a film finish. On log walls we favour a breathable penetrating finish and we check the chinking every visit. If a log home has a borate treatment for insects and rot, we keep that in mind and avoid stripping it off with an aggressive wash.
Want us to handle the wash and re-stain?
Cottage Care Company soft-washes and re-stains decks, log siding, and docks across southern Georgian Bay. Pick your area: