In this article, we’ll explore how to fix rotted wood using epoxy, guided by the expertise of This Old House general contractor Tom Silva. In the video above, you can watch Silva demonstrate this repair process from start to finish on a rotting windowsill.

Big Wood Rot Repair | Replace Rotten Wood with Epoxy Wood Filler ...

Achieve permanent structural wood rot repair using a two-part epoxy system. Detailed DIY instructions for lasting restoration.

New from WEST SYSTEM® Epoxy, the Wood Rot Repair Kit provides a cost-effective and time-saving solution for making repairs to rotted wood. This two-part, solvent-free epoxy system penetrates deep into damaged areas, consolidating weakened wood fibers.

New from WEST SYSTEM, the Wood Rot Repair Kit is a penetrating epoxy system designed to stabilize rotted wood without requiring full replacement.

Wood rot epoxy products offer a reliable way to stabilize, harden, and restore damaged timber. This guide highlights five effective epoxy repair kits and treatments, explaining where each shines—from quick-set fillers for window sills to deep-penetrating hardeners for structural repair.

Dry rot, caused by fungi that thrive in damp conditions, can severely weaken wood, leading to structural instability. To effectively fill in and repair dry rot, a specialized wood filler or epoxy resin is typically required. These products not only fill the gaps and holes left by the decaying wood but also help to prevent further fungal growth.

Fortunately, repairing rotted trim with epoxy is affordable and effective. Our guide will walk you through how to identify rot, prepare the area, and use epoxy to restore your trim. Wood rot is a common problem with exterior trim, especially in areas exposed to moisture.