Henry Co HE208042 Wet Patch Roof Cement 1 Gallon

Product Description

The HENRY CO HE208042 is a wet patch roof cement formulated to bond and seal on both wet and dry roofing surfaces, including surfaces with standing water. Packaged in a 1-gallon container, this product is used to patch and seal roof penetrations, cracks, flashings, and seams in emergency or scheduled repair situations. Roofing contractors and general contractors use this material when conditions do not allow for a dry surface prep — a common requirement when working through rain events or on low-slope roofs with poor drainage. The cement delivers a waterproof, flexible seal suited to built-up, modified bitumen, and asphalt shingle applications.

This roof cement is intended for residential and light commercial roofing repair work. Typical applications include sealing around flashings, patching split or cracked roofing membranes, and addressing active leak points at penetrations, valleys, and edges. Its ability to adhere under water makes it a practical option for urgent repairs where drying the substrate is not feasible. Professional roofers, general contractors, and facility maintenance technicians are the primary installers of this product.

Key Features

• Adheres to wet and dry surfaces, including underwater application
• 1-gallon unit suitable for patch repairs and spot sealing
• Packaged 4 units per case for jobsite stocking
• Waterproof seal for flashings, membranes, cracks, and penetrations
• Compatible with asphalt-based roofing systems including built-up and modified bitumen

Compatibility

Designed as an OEM-style repair material for asphalt-based roofing systems including built-up roofing, modified bitumen membranes, and asphalt shingle assemblies on residential and light commercial structures.

Installation Notes

Application is typically performed by licensed roofing contractors or qualified maintenance personnel. Remove loose debris from the repair area where possible before applying, even on wet surfaces. Apply with a trowel or putty knife, working the cement firmly into cracks or over the damaged area to ensure full contact and an airtight seal. Follow all applicable local building codes and manufacturer application guidelines regarding minimum and maximum temperature ranges for installation.