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Close up image of a vinyl siding panels warping or buckling.

Causes

  • May be caused by painting with dark colour. Dark paint tends to absorb the heat of the sun, transferring it to the substrate. When vinyl siding expands dramatically from heat, it may not be able to contract to its original dimensions.

Solutions

  • Avoid painting vinyl siding or other thin exterior PVC material with a darker colour than its original colour unless specifically recommended by the material or paint manufacturer.
  • Use high-quality exterior paints formulated with superior flexibility to withstand the stress of expansion and contraction cycles caused by outdoor temperature changes.
  • Siding that has warped or buckled should be assessed by a siding or home repair contractor to determine the best remedy. The siding may have to be replaced.

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