The Problem

Brian visited a commercial property in Chesapeake, Virginia, to investigate persistent leaks on a flat roof. Upon inspection, he found exactly what we call "roofing in a bucket"—layers of thick, mismatched sealant applied haphazardly over various sections. The property managers mentioned that someone had visited to "fix" the leaks before we arrived. Unfortunately, instead of solving the problem, the sealant masked the issues while trapping moisture underneath, causing the roof deck to deteriorate and sag.

The Technical Why

"Roofing in a bucket" refers to heavy, mastic-based sealants often found in standard hardware stores. While they might appear to be a quick solution, they are rarely appropriate for commercial flat roofing.

  • Expansion & Contraction: Flat roofing materials move significantly as temperatures shift throughout the day. Store-bought sealants often lack the elasticity to move with the roof, causing them to crack and peel.
  • Moisture Trapping: Applying sealant over the wrong areas creates a "dam" effect. Water that should naturally drain toward the scuppers or drains gets trapped behind the patch, seeping into the decking and rotting the structural wood or metal from the inside out.
  • Lack of Integration: Professional commercial roofing requires integrating materials according to strict manufacturer standards. Using a generic paste does not create a water-tight seal with existing roofing membranes.

Professional Advice

If a flat roof is leaking, the best step is to have a professional identify the source rather than attempting a temporary fix. A proper repair involves addressing the actual point of water entry using professional-grade, membrane-compatible components designed for longevity. If property managers feel tempted by a bucket of sealant, remember that it often costs much more to replace a water-damaged deck later than it would have cost to perform the correct, lasting repair at the outset.

Watch the full Roofing for Reel series to see more behind-the-scenes projects like this one. Don't let a small leak turn into a structural disaster. Give us a shout at 757-867-6600 or fill out the form on this page.