I get where you're coming from about pulling up more than you maybe need to. I’ve run into the same thing—especially when I started budgeting out my last re-roof. Plywood prices alone made me hesitate, but then I remembered the mess I had a few years ago after not replacing a questionable patch. Ended up with a leak right over my kid’s bedroom and a lot more drywall work than I ever wanted.
My process now is pretty methodical. I walk every square foot of the deck after stripping, checking for bounce or any hint of give. If there’s any doubt, I’ll use a screwdriver or awl to poke around—soft spots get marked and replaced, no debate. Sometimes it feels like overkill, but honestly, the peace of mind is worth it. I also double-check around eaves and valleys since those seem to rot out first in my area (Midwest, lots of snow melt and ice dams).
One thing I do try to balance is not tearing out boards just because they’re old. If the wood’s solid and there’s no sign of delamination or rot, I’ll leave it. I’ve seen some folks online say to just replace everything, but that can add up fast, and if it’s still structurally sound, it feels wasteful.
I’ve also started using a moisture meter after a rain (if timing lines up) before putting down underlayment. Found a couple spots last time that looked fine but were actually holding water—caught those before they became a bigger problem.
It’s definitely tempting to cut corners to save on materials, but every time I’ve done that, I’ve regretted it. Still, I don’t think there’s anything wrong with being a little picky as long as you’re not just ripping out good wood for no reason. It’s all about finding that line between being thorough and being practical—especially when you’re watching every dollar.
I get the urge to be super thorough, but honestly, sometimes I think folks go overboard with the poking and prodding. I manage a bunch of older duplexes, and if I replaced every board that flexed a little or looked “iffy,” I’d blow through my budget before even getting shingles on. In my experience, a little give isn’t always a death sentence—especially on older homes where nothing’s truly perfect anymore. I’ll swap anything soft or rotten, sure, but if it’s just a bit weathered and still holding nails, I usually leave it. Haven’t had a callback yet... but I do keep a close eye on those spots during inspections.
if I replaced every board that flexed a little or looked “iffy,” I’d blow through my budget before even getting shingles on.
I get the budget thing, believe me, but I’ve seen “just a bit weathered” turn into a trampoline after one good rainstorm. Last summer, we left a couple boards with some give (looked fine, held nails), and by fall, the new shingles had a weird dip. Boss was not amused. I’m not saying replace every plank with a personality, but sometimes it’s cheaper to swap one now than patch a saggy spot later... especially if your inspector has hawk eyes.
I get where you’re coming from on the budget, but I’ve seen too many “good enough” boards turn into soft spots after a season or two. It’s tricky, though—some flex is normal, especially with older sheathing, and not every little give means it’s toast. I usually walk the deck with a heavy boot, checking for bounce or that hollow sound. If it feels spongy or you can poke a screwdriver through, that’s a no-go for me.
One thing I’ve noticed: even if a board looks okay and holds nails, moisture can get in under the underlayment if there’s any rot starting. That’s when you get those weird dips or even leaks down the line. Had a job last year where only two planks were replaced to save money—by spring, both had swollen up and pushed the shingles out of alignment. Ended up costing more in repairs than just swapping them at the start.
I’m not saying rip out every board with a knot or some age on it. But if there’s flex that doesn’t feel right, or you see dark stains or mold underneath, it’s probably worth pulling it. Sometimes I’ll mark questionable spots and come back after lunch—if they still bug me, out they go.
It’s always a balance between cost and future headaches. If you’re in a wet climate or have low slope, I’d lean toward being pickier. Drier areas, maybe you can get away with leaving more in place. Just keep in mind inspectors (like me) are looking for anything that could compromise the roof down the road... and sometimes we’re pickier than homeowners expect.
Curious how others decide when “iffy” crosses into “replace it now.” For me, it’s mostly about how much give there is and what the wood looks like underneath—if it’s punky or soft at all, I don’t risk it.
You nailed it with the “future headaches” point. I get wanting to save a few bucks, but every time I’ve tried to patch around questionable spots, it’s bitten me later—especially in our rainy PNW climate. Even if the board seems solid up top, if there’s any hint of black staining or that musty smell underneath, I don’t mess around. I’ll admit, sometimes I overthink it and end up swapping more than maybe I need to... but it’s never come back to haunt me.
One thing I started doing is using a moisture meter on suspect boards, especially if the weather’s been rough or there’s any sign of past leaks. If the reading’s high, out it goes. And for anyone trying to be eco-friendly like me, salvaging borderline boards just isn’t worth the landfill savings if you end up tossing more material down the road.
I do agree some flex is fine—old-growth stuff can fool you with how much it moves but still holds up. But yeah, punky wood or anything even close to crumbling gets marked and pulled. Learned that lesson after a “good enough” patch job led to a full tear-off two years later... not fun.