Deck Joist and Beam Repair in Everett, WA

Deck joist and beam repair fixes the framing under your deck boards: the joists that carry the surface and the beams that carry the joists. It is for homeowners in Everett whose deck feels springy, slopes, or has soft wood underneath. We can tell you whether the frame can be reinforced or has to be replaced.

Signs your deck joists or beams are failing

Framing problems rarely start on the surface. Boards can look fine while the joists under them are soft or split. If you already know the damage is limited to the frame, this page covers it. For the wider picture of deck work, see our Deck Repair page.

Bounce and sag you can feel underfoot

A deck that bounces when you walk across it, or that dips between the posts, usually has joists that have lost stiffness. Water sitting in a low spot, or a railing that has started to lean, points the same way.

Damage you can see from underneath

Crawl under the deck with a flashlight and a screwdriver. Dark staining, fungus, and wood that lets the screwdriver sink in more than a little mean rot. Also look for long splits along the grain, notches cut for pipes, and joist hangers pulling away from the wood.

Sistering a joist: how the repair works

Sistering means fastening a new piece of lumber alongside a damaged joist so the pair carries the load together. It suits a joist that is cracked, slightly sagging, or sound for most of its length but weak in one area.

The new member should be the same depth as the old one, or deeper, and long enough to run well past the damage on both sides. We glue and fasten it with structural screws or carriage bolts in a staggered pattern, then add hangers or blocking where the load needs a clean path. Pressure-treated lumber rated for ground or heavy wet exposure is the usual choice for decks.

• Works when most of the original joist is still solid wood
• Does not work if rot runs through the full depth of the joist
• Needs the old joist jacked back to level before the new piece goes on

When a joist or beam has to be replaced

Sistering over rotted wood only hides the problem. If a joist is soft through its depth, or rot has reached the ends where it bears on a beam or ledger, we cut it out and install a new one. That means supporting the deck boards above, removing fasteners, and fitting a new joist with proper hangers.

Beams carry far more weight than joists, so the standard is stricter. A cracked or crushed beam is often replaced rather than patched, sometimes with a doubled or tripled member bolted through. The posts below it have to be sound too, which is why we often check post and footing repair needs at the same visit.

Replacing one joist among sound neighbours

When the rest of the frame is healthy, a single joist can be cut out and swapped without touching the deck boards on either side, though a few boards may need lifting for access.

Replacing or doubling a beam

A beam repair needs temporary support under the deck while the old member comes out. The new beam is sized for the span and sits on post caps or notched posts, fastened with through-bolts rather than nails.

What causes deck framing to rot, sag or split

Moisture is the main cause. Water that pools on top of a joist, drips past missing flashing, or splashes up from soil keeps the wood wet long enough for decay to start. The top edge of each joist is the most exposed, because screws from the deck boards open small paths for water.

Other causes include joists spaced too far apart for the decking above, notches or drilled holes that weaken the wood, undersized beams from an earlier build, and overloading from hot tubs, planters or crowds of guests. Where rot is the main issue, our rot repair page explains how we trace it to its source.

What a joist and beam repair visit involves

We start from underneath and on top, probing the wood and checking level along the joists and across the beams. We tell you what we find, show you the damaged areas, and describe whether sistering or replacement fits each one.

The work then follows a set order:

• Support and jack the deck back toward level
• Cut out wood that has decayed through
• Sister or replace joists and beams with treated lumber
• Install hangers, bolts and blocking, and protect cut ends with sealer
• Replace the deck boards that were lifted

Why we raise decks slowly

Jacking a sagging frame too fast can crack the connections or the boards above. We lift in small steps and check level as we go, then lock the frame in place before any new wood is fastened.

Deck framing in Everett's wet climate

Everett gets most of its rain from October to March, and wet decks stay damp for long stretches under cloud and marine air. That makes the lower edges of joists and the tops of beams the first places to go soft. Decks on sloped lots near the ravines in the southwest of the city also see extra runoff from above.

Older homes in Everett often have decks built decades ago with smaller joists and fewer hangers than current practice. When we repair those, we often upgrade the connectors while the frame is open, so the new work does not rest on weak old hardware.

Keeping repaired framing dry and sound

Repairs last longer when the frame can dry. Keep soil and plants away from the lower joists, clear leaves from gaps between boards, and make sure any ledger flashing sheds water outward. If the connection at the house wall looks suspect, our ledger board repair page covers that separate problem. You can also contact [Everett Deck Repair](/) to book a look at the frame.