
- Visually inspect the stair stringers and look for cracks or splinters. Stand on each stair and gently rock your body up and down to locate small cracks.
- Inspect the stringers from underneath the stairs using a flashlight. The cracks you observed above will be more pronounced underneath the stairs.
- Cut a piece of two-by-four to a length of 4 inches.
- Apply wood glue to one side of the two-by-four. Place the side coated with glue against the damaged stair stringer so that it covers the crack.
- Wait 24 hours for the wood glue to set.
- Drive two screws into each side of the two-by-four to further reinforce the stringer, then remove the clamp.
- Repeat this procedure for any other cracks in the stringers.
How do you repair cracked stringers on stairs?
It is important to inspect the them from time to time and repair them if they're cracked, especially on staircases that get a lot of use. Cracked or damaged stringers can usually be repaired by reinforcing them with wooden splints. Visually inspect the stair stringers and look for cracks or splinters.
Is it safe to use a broken stair stringer?
If the wooden stair stringer breaks for some reason, your stair case will not be safe to use. Many suggest that in home maintenance, the stringers should be inspected to detect any damages early. Wooden stair stringers can easily be repaired by following the step-by-step guide below.
How do I know when to replace the stringer on stairs?
A good indication that the stringer needs to be replaced will be any splits that remain open when there is no load on the stair. Professional advice should be sought before conducting this repair.
Why do you need stair stringers for stairs?
Stair stringers reinforce the staircase and ensure that your stairs remain solidly in place. It is important to inspect the them from time to time and repair them if they're cracked, especially on staircases that get a lot of use.

How do you fix a split stair stringer?
1:064:24Stair Stringer Damage Repair Ideas For 4 x 4 Beam Floor ... - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd then install some lag screws. Or carriage bolts or regular bolts with nuts and washers thatMoreAnd then install some lag screws. Or carriage bolts or regular bolts with nuts and washers that would run all the way through and connect the stair stringer to the block.
How do you fill cracks in stairs?
5:1015:54How to fix cracks along your staircase skirting and wall - Step by stepYouTubeStart of suggested clipEnd of suggested clipIf this had been a brick wall. Then there would be no big gap there there'd be no cavity. So youMoreIf this had been a brick wall. Then there would be no big gap there there'd be no cavity. So you could quite easily go ahead and fill it with some easy feel or plaster repair something like that.
Can you replace stair stringers?
0:185:48How To Remove And Replace Center Stair Stringers - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo if you do need to replace a center stringer then you're probably going to need to cut it in halfMoreSo if you do need to replace a center stringer then you're probably going to need to cut it in half or in some cases you might need to cut it into thirds. However if you can avoid cutting it.
How do you fill the gap between stair stringer and wall?
To caulk the gap between your stairs and wall, follow these steps....Caulk the GapPrep the Gap. First, remove all dirt, grime, and old caulk from the gap. ... Tape Around the Gap. ... Insert Backer Rod as Needed. ... Prep the Caulk Tube. ... Apply the Caulk. ... Finish the Caulk. ... Clean off Excess Caulk. ... Allow the Caulk to Dry.More items...•
How do you fill large cracks in wood stairs?
Inject carpenter's glue into the crack, then wiggle tread to work glue down into the crack. Smear glue onto tapered dowels, and then tap them into the holes with a hammer. Wipe off excess glue with a clean, damp cloth. File the ends of the dowels flush with the stair tread.
Can you use filler on stairs?
Use wood filler to smooth your stair's surface. Wood filler, also known as wood putty or grain filler, covers holes, dents, chips and deep grains in wood, disguising them and smoothing the surface. You can use wood filler on stairs to make them more aesthetically appealing and comfortable to walk on.
How do you reinforce stair stringers?
0:573:36How to Strengthen 2 x 8 Stair Stringer – Construction and Building TipsYouTubeStart of suggested clipEnd of suggested clipIt. Good make sure you nail it. And by that maybe use some 8d nails with heads on them of course.MoreIt. Good make sure you nail it. And by that maybe use some 8d nails with heads on them of course. And you know nail one every 16 inches on each side of the break.
How do you install interior stair stringers?
1:393:33How to Assemble and Install Interior Stairs | This Old House - YouTubeYouTubeStart of suggested clipEnd of suggested clipOnce the stair tread goes in this backer board goes in. And it gets fastened to the back. Side ofMoreOnce the stair tread goes in this backer board goes in. And it gets fastened to the back. Side of the riser. And then gets screwed up to hold the tread.
How do you attach stair stringers to joists?
Attaching Stair Stringers to Rim Joist. The simplest way to attach stair stringers to a deck is to attach them directly to the rim joist of the deck using hangers or lag bolts. There are several different types of hangers available, so we'll go over installation procedures for each type.
How do you fill a large gap between stair tread and riser?
If the gaps are not too severe, consider using colored caulk to cover them. This type of repair has one advantage: It's pliable enough to move with the steps. If the treads and risers continue to move, the caulking will move with it. It can also help to deaden squeaks and creaking noises.
How do you repair wooden stairs?
0:211:42Stairs repairs - YouTubeYouTubeStart of suggested clipEnd of suggested clipApply construction wood adhesive on each stair and install the new stair over the old. One. Stand onMoreApply construction wood adhesive on each stair and install the new stair over the old. One. Stand on the newly installed stair to ensure good bond with the old one.
Why are my stairs cracking?
Stair step cracks are among the most common of foundation cracks. These cracks are a clear sign of a problematic foundation. Typically, stair step cracks in a block foundation are a result of bowing walls. These cracks will be found toward the corners of the foundation, and are often found with a horizontal crack.
How do you fix chewed wood on stairs?
A: You have a few options: Use faux paint on the patch, cover the tread with adhesive-backed oak veneer, paint the stairs, cover the stairs with carpet or replace the tread. Faux paint or veneer might make sense as temporary fixes until your puppy learns to chew on something else.
How do you caulk stairs?
1:256:49How To Caulk A narrow Gap -Between wall and Floor StairsYouTubeStart of suggested clipEnd of suggested clipAnd I'm going to use a special tool called power coke in order to push. The silicon inside this gap.MoreAnd I'm going to use a special tool called power coke in order to push. The silicon inside this gap.
How to fix a crack in a stair stringer?
Hold a section of angle iron, approximately 18 to 24 inches long, depending on the length of the crack or split and if you are able to get to both sides of the stringer involved, up against the stair stringer. Center it over the split or crack. Use a metal mending plate, alternatively, for smaller cracks that do not completely penetrate the stringer's thickness.
How to tell if stringer is cracked?
Look closely at the stringers. Notice if the crack or split is relatively small and localized or if it runs for several inches or through the stringer's thickness.
How to fix a splint in a wood deck?
Cut a section of 2-by-4-inch lumber to a minimum of 4 feet in length. Spread a generous bead of construction adhesive along the length, squiggling the glue to ensure it spreads across the board. Hold the board up to the string er, from underneath, and clamp in place until dry to further reinforce the mended stringer. Drive screws through the splint and into the stringer every 8 to 10 inches, avoiding the area directly above and to the side of the split or crack by 3 or 4 inches.
How many pilot holes do you need for a split stringer?
Drill four to six pilot holes, slightly smaller in diameter than the mending plate or angle iron's bolts or screws, in position as indicated. Situate the anchors equally on both sides of the crack or split and do not attach closer to the void than 3 inches, even if you must skip holes. Drilling through the stringer close to the split or crack will weaken the stringer even more.
How long can you block access to a staircase?
Block access to your staircase until the stringer is repaired.
Do stairs wear down?
Stairs withstand a tremendous amount of abuse. Countless feet pounding, little feet jumping or running, heavy loads crossing and years after years of continuous use wear down your stairs when they receive little to no preventative maintenance. Over time, stairs may degenerate, with cracks and splits compromising the safety ...
Why do you need stair stringers?
Stair stringers reinforce the staircase and ensure that your stairs remain solidly in place. It is important to inspect the them from time to time and repair them if they're cracked, especially on staircases that get a lot of use.
How long does it take for wood glue to set?
Wait 24 hours for the wood glue to set.
How to tighten a stringer?
Step 1 – Examining the Stringers. The first step is to examine the stringers so you can see what repairs you need to make. Check the connections on top and bottom to make sure they are tight. A hammer can be used to tighten any joints that may be loose.
Why are stair stringers placed at the side?
They are the boards placed at the side to support the weight of the risers and the treads. Wooden stair stringers also support our weight as we go up and down the stairs. If the wooden stair stringer breaks for some reason, your stair case will not be safe to use.
How to fix loose steps?
If any steps are loose, they can be repaired by placing wood screws and an L bracket between the risers and the tread. A shim can be driven between the stringer’s top and tread’s end. This will tighten them before the L bracket is installed.

Step 1 – Examining The Stringers
Step 2 – Repairing Loose Steps
- If any steps are loose, they can be repaired by placing wood screws and an L bracket between the risers and the tread. A shim can be driven between the stringer’s top and tread’s end. This will tighten them before the L bracket is installed.
Step 3 – Checking The Stringer Board For Damage
- Stringer board can possibly have damaging cracks or splits in it. You can repair these by using mending splints and plates. A good indication that the stringer needs to be replaced will be any splits that remain open when there is no load on the stair. Professional advice should be sought before conducting this repair.
Step 4 – Starting The Stringer Repair
- Use a 2 X 4 brace on the hydraulic bottle jack’s top to lift the stairs. This will help to remove the weight from the split or cracked stringer. Apply a mending plate (heavy duty) to the stair stringer’s bottom edge. The mending plate needs to be at least 4 inches long. 2” drywall screws can be used to attach to the mending plate. A mending plate which is hammered down can be installed to ou…
Step 5 – Cutting The Lumber
- Cut piece of the 2 X 4 lumber to 48” to be used as splint. Construction adhesive can be applied on the 2 X 4 face. Using C clamps, clamp the 2 X 4 to the stair stringer. Treated deck screws can be used to now attach splint to the area which is damaged. To reinforce the repair, install a cripple (2 X 4) under the step which is affected below the damaged area. The jack can now be let down slo…