Building a deck that doesn’t wreck the planet

I ran into the chemical issue once when I salvaged some barn wood - looked amazing, but sanding it kicked up all kinds of weird smells. Ended up sealing it just to be safe, but I still wonder what’s under there. Composite’s definitely easier on maintenance, though I miss the feel of real wood underfoot. Has anyone tried thermally modified lumber? Curious if it holds up as well as folks claim...

Has anyone tried thermally modified lumber? Curious if it holds up as well as folks claim...

I’ve used thermally modified ash on two projects now. It’s impressive - stays dimensionally stable, barely cups or warps, and the color is pretty rich out of the box. Downside is, it’ll still gray out like any hardwood unless you oil it. Maintenance is less than ipe or cedar, but not zero. Also, it doesn’t have that “old barn wood” character - more uniform, almost too perfect sometimes. For decks where you want longevity and fewer chemicals, though, it’s hard to beat. Just make sure the fasteners are up to snuff since the boards can be a bit brittle at the edges.

For decks where you want longevity and fewer chemicals, though, it’s hard to beat. Just make sure the fasteners are up to snuff since the boards can be a bit brittle at the edges.

I get the appeal of thermally modified ash, especially with the stability and lower maintenance. But honestly, for those of us watching costs, it’s not always the most wallet-friendly option up front. I’ve had good luck with locally sourced untreated pine, sealed well and elevated off the ground. Sure, it needs more upkeep, but the upfront savings are pretty significant. And you can get a bit more of that rustic “old barn wood” vibe if you’re into character over perfection. Just something to weigh against the “almost too perfect” look you mentioned.

you can get a bit more of that rustic “old barn wood” vibe if you’re into character over perfection.

That’s actually what sold me on pine - mine’s got knots and weird grain patterns everywhere, but it’s got personality. I know it means I’ll be sanding and sealing more often, but I kind of like the process (at least for now). Has anyone tried mixing woods for their decking? Like, using something durable just for the steps or edges, then pine for the rest? Wondering if that’d help balance cost and longevity without looking totally mismatched…

Mixing woods can actually work pretty well, especially if you’re strategic about where you put the more durable stuff. I’ve seen decks where folks use something like ipe or black locust just for the stair treads and outer trim, then fill in with pine or even reclaimed fir for the main surface. It’s a smart way to stretch your budget and still get some longevity where it matters most.

Has anyone tried mixing woods for their decking? Like, using something durable just for the steps or edges, then pine for the rest?

The only thing I’d watch out for is how different woods weather over time. Some species fade to gray faster than others, and sealers don’t always even that out as much as you’d hope. If you’re okay with a bit of contrast (which honestly can look cool - kind of patchwork-y), it’s not a big deal. But if you want everything to blend, maybe test some offcuts side by side first.

I totally get what you mean about enjoying the process. There’s something satisfying about sanding down rough spots and seeing all those knots pop out after sealing. Pine’s got its quirks, but it’s definitely got character - plus, if you’re sourcing from local mills or reclaimed stock, it keeps the footprint lower.

One thing I’d suggest: make sure any fasteners or hardware are compatible with both wood types, especially if you’re using pressure-treated pine alongside hardwoods. Galvanic reactions can sneak up on you and cause staining or corrosion over time.

All in all, your approach sounds solid. Decks don’t have to be perfect to be beautiful - or sustainable. Sometimes the “imperfections” end up being what makes them stand out anyway.