HOW-TO GUIDES

How to Install a Deck Ledger Board and Attach Flashing

SHARE

Our How-To team takes you through the process of properly build, install, and flash deck ledgers boards step by step.

 

Disclaimer: Instructions provided by Trex® are based on the build specifications that Trex® demonstrated in the Trex® Academy video series and are not universal to all homeowners’ projects. A homeowner’s build may vary from Trex’s instructions based on the homeowner’s local municipality requirements, individual design preference and project specifications. For questions or assistance needed during your project, please reach out to howto@trex.com

6-12 Hours with a Team of Two*
*Timing is estimated for a 14'x22' deck with two workers with intermediate carpentry skills. Estimate includes installing a 22' long ledger board, fasteners, back, bottom, and top flashing. Siding replacement is not included in this estimate. Times may vary based on the existing home and deck condition as well as the complexity of the shape and features of the deck.
0:00 / 26:48
For any home project, be certain to follow local code and permitting requirements.
© 2022 Trex Company, Inc.
01. Intro 00:00
02. Back Flashing 00:45
03. Ledger Board Location 01:38
04. Ledger Board Length 03:22
05. Breaker Board Layout 04:51
06. Guardrail Post Layout 08:09
07. Joist Layout 11:30
08. Ledger Fastener Layout 14:19
09. Flashing Ledger Layout 21:35
10. Ledger Board Attachment 24:19

Design your dream deck before you build it.

From colour, railing and deck shape, our Deck Designer tool lets you hand pick every element of your new deck. Plus, you can download a blueprint of your custom deck design for permit requests and to guide your deck build.

*only available on desktop 

Step-by-Step Instructions
Chapter 01: Site Preparation
Print This Chapter

So you're ready to get started? Watch our how-to tutorial before you start your build.

Before you begin any DIY project, make sure to wear the appropriate personal safety equipment. Eye protection, ear protection, gloves, long pants, a long-sleeved shirt, and reinforced toe shoes are recommended. Always make sure that you have a first aid kit nearby. For any home project, be certain to follow local code and permitting requirements. 

 

Step 1: Remove Siding of House

The siding on the house will need to be removed before installing the deck ledger board.  Make sure to remove enough siding to be able to install the back flashing above the ledger board and below the ledger board.  This will vary per municipality so check with the local jurisdiction in the area for specific dimensions.  In this case the numbers were 6” above the ledger and 3” below the ledger.  More siding was removed in this case due to the rot found in the sheathing.  Once the sheathing was replaced, back flashing was installed to preserve the life of the new sheathing.


Tools

Chalk Line

Circular Saw

Drill

Drill Bits

Hammer

Level

See All


Unable to Add to Cart

You may order up to 4 free samples. To adjust your selections, remove what you do not need and then add your new choices.