Water leakage around windows & doors is a major problem in new homes. Follow these updated window flashing details leakproof installation.

The following graphics show the essential steps for installing window or door flashing; these align with installation guidelines from most product manufacturers.

Jun 21, 2025 · Whether installing new windows and doors or adding siding to existing units, check your local codes first, then follow these instructions for installing door and window flashings …

While the methods described are for typical installation of replacement windows, it’s important to install flashing and to apply sealants as required by the manufacturer’s installation instructions …

Flashing detailing depends on the selection of (1) window type (flanged or non-flanged) and door type (with or without integral molding); and (2) window/door installation sequence …

Nov 25, 2024 · In this guide, we’ll walk you through how to make and install custom aluminum window flashing just like This Old House general contractor Tom Silva does in the video above.

When in doubt, though, follow the window manufacturer’s instructions. The International Residential Code (R613.1) requires windows to be “installed and flashed according to …

Aug 8, 2025 · Highlights Flashing keeps water out and protects window frames, so if it’s missing or damaged, it can cause leaks and mold. Key types of window flashing include sill, jamb, …

Here we provide best-practice details about flashing and sealing around windows to avoid air and water leaks.

These details show a TYPE III flash pan (flexible mem-brane) and were based on ASTM E2112. This is one way to prep and flash a sill. Your situation may be differ-ent from those shown …