Description/Cause: Ponding on a roof is the collection of water due to improper roof slope or improper drainage. This undesired condition and the added weight causes stress over seams and membranes that can lead to splits and allow water to enter the roof system. Over time ponding water can accelerate the deterioration of roofing membranes.
Damage Created by Condition: Accelerated aging of roof surfaces causing granule loss, membrane deterioration leading to porous roof surfaces, failing seams and splits. These conditions will all ultimately lead to leaks in the roof system and damage to roofing components. Multiple freeze-thaw cycles will cause damage at an even quicker rate.
Suggested Maintenance/Product.s Required:
For BUR, Smooth & Modified Bitumen Membrane Roofs: Clean the ponded area with KARNAK #799 Wash-N-Prep as dirt collects in these areas and rinse with clean water. Allow areas to completely dry then apply KARNAK #229AR Elastomeric Brush grade over the ponding area and extend 6’ feet beyond.
For Single Ply Roofs such as EPDM, TPO, PVC and Hypalon: Reinforce and seal membrane seams in the ponded areas and extend 6’ feet beyond. Seal seams with either a three-course repair using KARNAK #502 Karna-Flex and KARNAK #5540 Resat-Mat or use KARNAK #550 Patch-N-Go Fleece Tape covered by a layer of 502 Karna-Flex.
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