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Drawbacks of outdoor wooden projects

Blog by Rob Brown
One Rough Raft

Now that it’s late October, I’ve been bringing wooden items indoors, or at least putting them in our shed, to prepare for winter.

Tables, chairs, planter boxes, our railing bar and a few other bits and pieces are all wooden. We live near Little Lake in Peterborough, Ontario, and this morning I saw a floating raft that was brought in and put on shore for the winter. The main structure of the raft is made of wood and is really showing the signs of age. Obviously, we all enjoy making things out of wood, but I often wonder if we should make outdoor projects out of the material we all know and love, as the likelihood of it rotting prematurely is quite high.

The great outdoors is a harsh environment for wooden items. The lumber we use started its life as a tree, which needs outdoor conditions to grow, but that doesn’t mean keeping it there once it’s cut into lumber is the best long-term approach. A tree is a living organism that has ways of protecting itself from the sun, rain, snow and other elements, as well as ways to defend itself from bacteria, fungus, rot and other dangers. But eventually all trees succumb to the effects of age. Once a tree dies, it quickly starts decomposing and eventually returns to the forest floor.

It's our natural go-to material

I can easily understand why we use wood in outdoor projects. Aside from the fact that it’s our favourite material and we have the tools to work it, it’s also plentiful, strong and looks great with a new coat of finish on it. The problem is, as time goes on, the elements break down the wood and weaken adhesives, causing loose joints and rot. A finish will help protect wood from deteriorating, but only so much and for so long. Even the best exterior finishes need to be reapplied, which is something we’re not all great at. Making a project is fun, but maintaining it is often a pain in the neck.

Wood is still an option

I’m not saying wood should never be used in an exterior project. I think there are three points to consider when choosing wood for exterior use. To start with, select the right materials for the task. Cedar, ipe, white oak and teak all stand up well outdoors. Do a bit of research and select a species that will at least give the project a headstart outside. This is especially true if the project will come into contact with the ground, as excessive moisture will make the situation more challenging. And while we’re on the topic of materials, ensure you’re using waterproof adhesives.

This leads me to my second point: proper engineering. Proper engineering is always important when building a piece of furniture, but it’s even more critical when the project is going to live outside. Rain and humidity challenges will be huge. There are obviously the basic considerations, like allowing wood to expand and contract as humidity levels change, but also seemingly smaller issues like trying to keep your project from coming into contact with the ground. Adding small rubber or plastic feet to the underside of legs will keep the piece slightly off the ground and stop water from wicking up into the legs or base of the piece. Another small engineering tip: don’t drive screw heads below the surface of the wood, as that creates a little cavity where water can pool and quickly soak into the wood, causing further problems.

The third point is maintenance. This isn’t my strong suit. With so many other tasks to accomplish and projects to build, I dislike spending time on pieces that I’ve already completed, but maintenance is important. The main aspect to maintenance is the choice of finish for a piece. Cleaning the surface and reapplying a coat of two of finish when needed will also go a long way to having your tables, chairs and other woodwork last as long as possible.

My current project

Part of the reason why using wood for outdoor projects has been on my mind is because I’m in the middle of creating two window frames and three storm windows for a heritage house in Peterborough. Pine is the traditional material for this situation, so that’s what I’m using. Although the frames will be outdoors for most of their lives (the storms will come inside during the summer), they still stand a good chance of living a long life since they won’t be sitting in water too often and they will be properly painted and maintained throughout their lifespan. The windows I’m replacing are likely at least 75 years old and might even be close to double that. There’s certainly some rot here and there, along with the odd loose joint, but considering these frames would have turned completely to dust if they had been sitting on the ground and didn’t get properly maintained, I’m pretty impressed.

Hopefully, these new window frames won’t need to be replaced for another century or so. Building objects that will last goes a long way to respecting the material we all love. It also allows us to spend more time building our next project, rather than having to replace the exterior project we built 10 years ago, but didn’t design or maintain properly.

One Rough Raft

This raft, which was recently brought up onto shore for the winter, is showing pretty severe signs of deterioration. This is pretty normal for outdoor projects made of wood.

One Rough Raft

Time to Replace

I'm currently building some windows for a heritage home in Peterborough. This is one of the upper storm windows. Many layers of paint have helped protect it from the elements, but time has still dealt a toll on the wood and joints holding it together.

Time to Replace
Published:
Last modified: October 24, 2024

Rob Brown - [email protected]

Rob is a studio furniture maker and the editor at Canadian Woodworking & Home Improvement. Instagram at @RobBrownTeaches

6 Comments

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  2. Rob, I make barn signs. I’ve made them f4om laminated solid wood and plywood. No matter how well I finish them they end up Coming apart or warping. They are meant to be left up after all. I finish with Spar varnish and give the can to the new owner to touch up as needed. So upsetting when they report the signs coming apart or warping. I’ve replaced two. Any suggestions?

  3. Choice of wood for outdoor projects . Most of your responses refer to the best woods for outdoors . cedar, white oak, ipe and teak. Yes they all weather very well, however the million dollar question is cost. Using cedar vs ipe has its pros and cons, the real question is what is your budget for the intended outdoor project.

  4. With outdoor wood projects, I find a few basics make a big difference in how long a project lasts. For fasteners I only consider 2 options – hot dipped galvanized nails or stainless screws. Coated screws just don’t cut it for me. i have taken lots of projects apart where the wood was still good and the coated screws quit rusty. Caps over any end grain that is going to collect water is also a must. I also choose my wood carefully to minimize large knots as these/ area around them tend to rot quicker. As pointed out in the article, rubber feet keeping what you can off the ground, goes a long way to preventing rot as well.
    As for wooden windows these days lasting as long as the old wood windows from yesterday, I wood not hold my breath. those old windows were made of quality straight grained , knot free wood- Cedar and Fur/ Hemlock from what i have seen. Today’s wooden windows, if you can find them are mostly pine and not what I consider desirable pine either. Also, IMO a nicely finished vinyl window with wood trim and frame of choice looks just as good and lasts way longer. IMO

  5. Wood, used outdoors, is a renewable material. The illustrated dock is a relatively inexpensive example of the genre. The rotten wood shown is apparently in contact with the water when in use. A more robust attachment of the barrels would reduce the need to contain them. Then the lower band and post could be raised to keep them from being so exposed to wet and dry cycles. If the dock is stored as shown, the deck won’t last as long as it might. It should either be turned over and rest on the barrels or lifted to rest on sacrificial planks away from contact with the earth.

  6. I agree with your article fully, Wood is a great natural alternative for all outdoor projects even though it has a finite lifespan.
    I’ve had pieces last 25 plus years due to extra efforts taken during construction (prestraining all components prior to assembly and maintaining the finish).
    I recently had the privilege of restoring/rebuilding the lower sashes for the windows and sills in a 135 year old church. The original units were made of yellow pine and fir. I was fortunate enough to get a hold of some reclaimed Douglas Fir to rebuild the the sashes. The sills were redone with white oak. We took the time pre seal the sills on all sides prior to installation. The sashes were also presealed prior to assembly. I’m not sure if well get the same life span as the originals but here’s to hoping!

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