Shingle buckling is a wave-like ripple or distortion running across a roof surface, typically affecting a horizontal line of shingles rather than isolated individual pieces, often caused by movement or irregularities in the roof deck beneath rather than a problem originating with the shingles themselves.
Because this pattern frequently traces back to deck-level issues, like improperly installed sheathing, moisture-related warping, or old roofing left in place beneath a new layer during a reroofing job, diagnosing buckling often requires looking past the shingles to the structure underneath.
Buckling can also occur if shingles were installed without adequate room for normal thermal expansion, causing the material to distort and ripple as it responds to temperature changes over time.
What Causes Shingle Buckling?
- Roof deck movement or irregularities
- Improperly installed sheathing panels
- Old roofing layers left in place beneath new shingles
- Inadequate expansion allowance during shingle installation
Why Is Shingle Buckling Important?
Because buckling frequently indicates an underlying deck-level problem rather than simply a surface shingle issue, addressing only the visible symptom without investigating the root cause often means the buckling will recur even after replacing the affected shingles. This is why a thorough inspection tracing the buckling’s likely cause is worthwhile before committing to a repair approach.
Buckling patterns that follow the layout of old roofing material left beneath a new layer during a previous reroofing job specifically point to that practice as the probable cause, reinforcing why proper tear-off, rather than roofing over existing material, is generally the more reliable long-term approach. This deck-first approach to diagnosis tends to produce more effective and lasting repairs.
Shingle Buckling vs. Shingle Curling
Shingle buckling involves a broader wave-like pattern often tied to deck-level issues. Shingle curling involves localized upward warping at individual shingle edges or corners, more commonly related to the shingle material’s own aging rather than deck problems beneath.