Old boards on an old frame
Most decks we are asked about were built with the house. They are pressure-treated pine, fifteen to thirty years old, hanging off the back of a house on a lot that slopes toward the trees. The boards are gray and cupped, a few are cracked, the stain has worn off the traffic path, and the owners want to know one thing: can we just replace the boards?
Sometimes yes. New decking or a composite surface on a sound frame is a perfectly good project, and it is less work than a rebuild. But the boards are the part of a deck that matters least to whether it is safe. They are what you see. What holds the deck up is the frame underneath, and on a deck that age the frame has spent its whole life damp, shaded and out of sight.
The choice between resurfacing and rebuilding gets made under the deck, not on top of it. Here is how we work through it on houses around Alpharetta, where wooded, sloped lots mean many decks stand well off the ground on the downhill side.
Start underneath, not on top
The inspection starts with a flashlight and a screwdriver. Push the tip into the joists, the beam and the posts, especially at the ends and wherever two pieces of wood touch. Sound treated lumber resists. Rotten wood lets the screwdriver sink in with little effort, and the fibers come out soft and stringy.
The places that rot first are predictable: the tops of joists right under the boards, where water sits in the gap; the ends of joists where they meet the beam; the posts at ground level; and anywhere leaves pile up against wood. Look at the hardware too. Joist hangers and fasteners from that era were often not rated for treated lumber and corrode, and a rusted-through hanger is holding nothing.
Then look at the connection to the house. That is the most important joint on the whole deck, and it gets a post of its own: why deck ledgers fail covers it in detail. If the ledger or its flashing is in bad shape, nothing about the boards matters until that is fixed.
When new boards are enough
Resurfacing makes sense when the frame is sound, the deck feels level and solid when you walk it, the footings and posts are in good condition, and the ledger is properly attached and flashed. Under those conditions, replacing the decking and railings gives you what is essentially a new deck for a good deal less work.
A few things still need checking. Joist spacing matters if you are switching materials, because many composite boards need joists closer together than the original pine did. If the existing joists are too far apart, extra joists can often be added between them rather than rebuilding the whole frame. The tops of the joists need protection too. Joist tape laid over the frame before new boards go down keeps water from sitting in the fastener holes the way it did for the last twenty years.
Resurfacing is also the moment to fix the things that always annoyed you. A step that was too tall, a gate that never latched, a section that holds water after rain. Those get handled while the boards are off and the frame is exposed.
Signs the structure has to go
Some findings point straight at a rebuild. Rot in more than a handful of joists, rot in the beam, or posts gone soft at the base all mean the frame has reached the end of its life. Patching individual pieces of a frame like that tends to move the failure to the next piece over.
The footings are the other tell. Older decks were often built on shallow concrete pads or on posts set straight into the ground. In red clay, which swells when wet and shrinks when dry, those footings move. The result is a deck that has dropped at one corner, pulls away from the house, or bounces in one spot. Proper footings go down below the frost line onto undisturbed soil and are sized for what the deck carries.
Changes in size push things the same way. If you want the deck bigger, higher, covered or carrying a hot tub, the original frame was never designed for that. At that point rebuilding the structure is simpler and safer than reinforcing something built for a different job. Either way the new structure gets permitted and inspected, which is how all of our deck installation in Alpharetta runs, including the covered decks that tie into the roof.
Trees, shade and a deck that never dries
The wooded lots that make these backyards pleasant are hard on decks. Shade means the boards stay damp longer after every rain. Leaves and pine needles collect in the gaps between boards and against the posts, hold water, and start rot. Pollen and sap leave a film that mildew loves.
A rebuild or a resurface can account for that. Board spacing that lets debris fall through rather than packing in, airflow under low decks, and keeping wood out of contact with soil all help. Material choice matters as well. Composite and treated pine both hold up, but they need different care, and in heavy shade neither one looks after itself.
The upkeep is simple, and it matters more here than in a sunny yard. Clear the leaves out of the gaps a couple of times a year, wash off mildew before it settles in, and keep a finish on any wood surface. A deck that dries out between rains lasts much longer than one that never gets the chance.
Rails and stairs get judged on their own
Even when the deck frame is fine, the railings and stairs often are not. Rail posts on older decks were frequently notched and bolted to the outside of the rim joist, a detail that loosens over time until the rail wobbles under a hand. Balusters may be spaced wider than a small child can slip through. Stairs may have uneven risers, no handrail you can actually grip, or stringers resting on bare dirt at the bottom.
None of that is cosmetic. A loose rail on a deck standing well off the ground is a real hazard, and stairs are where people actually get hurt. When we resurface, railings and stairs are rebuilt to current requirements as part of the job, and inspectors look at them closely. If the boards are fine but the rail moves, the rail is the project.
What deck owners ask us
How often should a deck get checked?
Every few years, and any time something changes, such as a soft board, a rail that moves, or a gap opening between the deck and the house. You can do the screwdriver test yourself in an afternoon. If anything you find worries you, a second set of eyes is worth having before the next cookout.
Can composite boards go on our existing frame?
If the frame is sound and the joists are close enough together for the boards you want, yes. If the spacing is too wide, extra joists can often be added. We check the manufacturer’s spacing requirement against your frame before anything is ordered, so it never comes up halfway through installation.
Is it worth staining a deck we plan to replace?
Only if the replacement is a long way off. A coat of finish protects the boards but does nothing for rot already in the frame. If a rebuild is coming, put the effort into planning it instead, and keep the deck clear of leaves and standing water in the meantime.
Have the frame looked at before choosing boards
Picking a board color is the fun part, and it can wait. Find out first what is holding the deck up. Call (678) 665-7771 or send a note through the contact page, and Igor will come crawl under it with you and tell you which kind of project you have.