Are Bubbles on EPDM Roofs a Serious Problem?<\/figcaption><\/figure>\nBubbles, commonly known to many as blisters on EPDM roofs, signify air or moisture trapped underneath the membrane. Even though small blisters may not immediately negatively impact the roof\u2019s function, they can pose various problems in the future, like membrane strain and ultimate failure. The proportions of the blisters determine the severity. Inspections and installation methods, as with most issues, are essential and, if not taken carefully, can significantly exacerbate the roof’s performance. If the blisters are proportionally more significant than minor, or if they are unsightly and continuing to develop, then a check-up from a professional is warranted for better roof maintenance.<\/p>\n
<\/span>Are Small Bubbles<\/strong><\/b> Typically Harmful?<\/span><\/h3>\nTiny bubbles in an EPDM membrane do not pose significant issues if they are less than one inch wide and do not inhibit membrane adhesion and overall usage. These bubbles are usually attributed to slightly trapped air due to poor workmanship during installation or expansion of the membrane due to temperature fluctuation. However, while the bubble count or size staying in proportion may not have any negative repercussions, enlarged bubbles increase the chances of introducing stressed membranes, leading to tearing or pulling away from the underlying structure.<\/p>\n
The phenomenon must be observed to determine what measures should be implemented to ensure they do not surpass critical thresholds, such as noticeable membrane lifting or reaching sizes larger than 2-3 inches wide. Small-scale bubbles larger than 1 inch can be regularly monitored through biannual inspections, especially following severe weather, to ensure that remedial measures are implemented. The prevention of substantial blistering and other negative repercussions on the membrane is ensured by maintaining a stronger than 2.0 psi bond on the initial adhesive. Blistering of the membrane can be controlled to a great extent, allowing the roof to do its function.<\/p>\n
<\/span>When Do Bubbles or Blisters<\/strong><\/b> Become a Concern?<\/span><\/h3>\nBlisters and bubbles become problematic if they affect the membrane’s performance, integrity, or life span. Some indicators are more expansive than 2 to 3 inches in diameter, blistering over a wide area or lifting blisters that separate from the membrane. These can also undermine waterproofing ability and become stress points that, when exposed to thermal cycling or mechanical stress, can tear apart or detach. Blisters filled with water or vapor that suggest prolonged moisture infiltration are especially detrimental because they compromise the substrate materials and worsen structural issues. Inspect regularly and make timely repairs to ensure little blisters do not aggravate large-scale roofing damages.<\/p>\n
<\/span>How Can a Roofer<\/strong><\/b> Assess Damage to the EPDM Membrane<\/strong><\/b>?<\/span><\/h3>\nRoofers can diagnose damage to the EPDM membrane using visual assessments and testing. During the visual inspection, one should look for areas with cuts, rips, pooling water, material shrinkage, and seam separation. These areas can be accompanied by discolorations or patches that suggest trapped moisture and a change in freshness.<\/p>\n
Key technical parameters to evaluate include:<\/p>\n
\n- Seam Integrity<\/strong><\/b>:<\/li>\n<\/ol>\n
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\n- Ensure seams are correctly adhered to without separation. Use a seam probe to test the strength of adhesive or taped seams.<\/li>\n
- Industry-standard guidelines recommend a minimum seam overlap of 2\u20133 inches for proper performance.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
\n- Thickness Tolerance<\/strong><\/b>:<\/li>\n<\/ol>\n
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\n- Measure the membrane thickness using a caliper to ensure it has not thinned or worn down. Standard EPDM membranes are typically available in 45 mil (1.1 mm), 60 mil (1.5 mm), or 90 mil (2.3 mm) thicknesses.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
\n- Puncture Resistance<\/strong><\/b>:<\/li>\n<\/ol>\n
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\n- Check for punctures or mechanical damage caused by external impacts. Ensure no sharp protrusions compromise the substrate beneath.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
\n- Moisture Testing<\/strong><\/b>:<\/li>\n<\/ol>\n
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\n- Use infrared thermography or electrical impedance testing to detect moisture accumulation beneath the surface. This prevents undetected deterioration from further compromising the structure.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
Document any findings and use this data to determine the appropriate course of action, whether it involves patching, re-sealing, or replacing membrane sections. Consistent preventive maintenance can prolong the EPDM membrane’s service life and help avoid costly repairs in the future.<\/p>\n
<\/span>References<\/span><\/h2>\n\n