Backyard playsets are a wonderful investment in your family’s fun and health. Whether you have a cedar swing set, a redwood climbing tower, or a premium vinyl-coated frame, outdoor structures inevitably face weather challenges that can lead to visible cracks, known as checking and splitting. While many homeowners panic when they see these cracks, the reality is that some checking is perfectly normal, while other situations require timely repairs.
This guide will help you understand the difference between harmless checking and structural splitting, plus share proven maintenance strategies to keep your playset safe and beautiful for years to come.
What Is Checking, and Why Does It Happen?
Checking refers to small, narrow cracks that appear along the grain of wood. Almost every piece of lumber used outdoors will develop checks over time. These cracks occur naturally as wood dries and releases internal moisture. In the sun, the wood’s surface shrinks faster than the inner core, creating tension that forms visible cracks.
Key characteristics of normal checking:
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Typically runs with the grain (lengthwise).
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Often shallow or only partially through the board.
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May widen in dry seasons and tighten in damp weather.
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Common in cedar, redwood, and pressure-treated pine.
Important: Checking does not usually reduce a board’s strength. It is mostly cosmetic and expected.
What Is Splitting?
Splitting describes deeper, wider cracks that can compromise structural integrity. Splits often occur when:
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The wood endures repeated moisture cycling without sealing.
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Heavy loads stress the boards near fasteners or joints.
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Hardware loosens, allowing movement that tears the fibers.
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Large checks worsen over time and extend fully through the lumber.
Signs you are seeing splitting rather than checking:
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Cracks wider than 1/4 inch.
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Gaps that extend through the entire thickness of the board.
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Splits running across the grain or through joints.
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Boards that feel loose, wobbly, or unstable.
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Visible warping or separation of wood layers.
If you see these issues, it’s time to take action to prevent injury and protect your investment.
How to Tell the Difference: Normal Checking vs. Damage
Here’s a simple visual checklist you can use:
| Feature | Normal Checking | Splitting/Damage |
|---|---|---|
| Width of cracks | Hairline to 1/8” | >1/4” wide |
| Direction of cracks | Along the grain | Across grain or through joints |
| Depth | Surface-deep | Full thickness of the board |
| Structural impact | None, board remains solid | Weakness, looseness, or visible movement |
| Changes over time | Seasonal open/close but stable | Spreading, worsening, or causing instability |
If you notice a combination of large width, depth, and structural looseness, consider it damage that must be repaired or replaced.
When to Worry About Checking and Splitting
Checking is almost always safe if:
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The board remains firmly anchored.
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No movement occurs when pressure is applied.
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The crack is shallow and doesn’t trap water.
Splitting is a problem if:
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You feel give when pushing or pulling the affected area.
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Hardware is pulling out of the split.
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Pieces of wood are separating completely.
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The split occurs in a support beam or load-bearing area.
If you’re unsure, consult the playset manufacturer or a professional installer. Better safe than sorry.
Tips for Preventing Excessive Checking and Splitting
While you can’t avoid all checking, you can slow it down. Here are proven ways to preserve your wood:
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Seal and Stain Annually
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Use a high-quality UV-resistant wood stain or sealer.
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Pay special attention to end grains, which dry faster.
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Reapply each spring to protect against sun and moisture.
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Keep Hardware Tight
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Loose bolts and screws cause boards to flex.
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Check and tighten hardware every season.
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Replace rusted or stripped fasteners promptly.
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Install Shade Cover
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A pergola or shade sail over your playset reduces UV stress.
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It also keeps surfaces cooler and more comfortable for kids.
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Elevate Off the Ground
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Keep posts and support beams off soil or mulch if possible.
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Moisture wicking from the ground contributes to internal stress and rot.
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Sand Rough Edges
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If a check splinters slightly, sand it smooth to prevent cuts and splinters.
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Follow up with sealant.
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How to Address Moderate Checks and Early Splits
When you notice widening checks, take these steps:
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Clean the Area: Remove dirt and debris with a soft brush and mild soap.
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Fill if Necessary: For aesthetic reasons, you can use exterior wood filler, but keep in mind this is cosmetic—it does not restore strength.
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Seal Thoroughly: Apply a fresh coat of sealant over the filled or sanded area.
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Monitor Seasonally: If the crack gets deeper or wider, plan for replacement.
Note: Never rely on wood filler for structural repairs. It’s only for cosmetic surface gaps.
Repairing Structural Splits
If a board or beam is split through its thickness or shows movement:
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Remove and Replace:
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It’s usually best to replace the affected component.
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Many manufacturers sell replacement parts.
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Sistering Beams:
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For larger posts, you can bolt a new piece of lumber alongside (sistering) to reinforce the area.
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Always consult the manufacturer before attempting this.
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Reinforce Hardware:
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Use longer bolts or additional brackets to stabilize joints.
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Avoid lag screws in damaged wood—switch to through-bolts and washers for better strength.
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Seek Professional Help:
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If unsure, hire a professional installer or carpenter.
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Safety is more important than aesthetics.
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General Maintenance Checklist for Backyard Playsets
To prolong the life of any wood playset:
✅ Weekly Visual Inspections
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Look for cracks, rust, splinters, and loose components.
✅ Monthly Cleaning
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Remove dirt, mildew, and sap with mild soap.
✅ Biannual Tightening
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Check all hardware for movement or corrosion.
✅ Annual Sealing or Staining
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Protect wood from UV rays and moisture.
✅ Accessory Checks
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Inspect swings, slides, and ropes for wear and replace as needed.
✅ Ground Cover Maintenance
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Keep mulch or rubber mats at least 6 inches deep to cushion falls and improve drainage.
Common Questions
Q: My cedar playset has lots of small cracks—is it ruined?
A: No—cedar naturally develops checks as it dries. As long as the cracks are shallow and the wood is solid, this is normal.
Q: Can I fill deep cracks with caulk or filler?
A: You can fill small cracks for appearance, but structural cracks need board replacement. Filler doesn’t restore strength.
Q: Should I cover my playset in the winter?
A: If you have severe winters or heavy sun exposure, consider a weather-resistant tarp or canopy when not in use.
Final Thoughts: Keep Your Playset Safe and Beautiful
Wood is an organic material that changes over time. It shrinks, expands, and weathers in the elements, leading to checks that are perfectly normal. By understanding what is cosmetic versus structural, you can maintain your backyard playset safely and confidently.
Consistent care, timely inspections, and quality sealant will help your investment last for many seasons of family fun.
Need professional help or looking to upgrade your playset? Visit TexasBackyardStructures.com or stop by our Round Rock showroom. We’re here to help you keep your backyard beautiful and safe.
