Deck joists and ledger gap


Thanks Gary, let me clarify, so your overall stance is not to shim anywhere on the project due to trapped moisture? Are you also saying that the H1Z hurricane ties and blocking will make up for the lack of support from the gap?

Good tip about the blocking as well, I'll do what you said and prevent it from completely touching the beam on the bottom and the deck boards on top. The old deck had blocking which wasn't ripped and rested flush on the beam in between the joists, this is where major mold and fungus was growing. They also didn't stagger the spacing either for the blocking, it was in a straight line all the way across.

To prevent gaps in the hanger should I have someone help raise the end of the joist level and nail it in? All I have been doing is pushing the joist as far back as it will go in the hanger, keeping it at the natural sloped angle. I don't know how the previous deck builder did it but the joists end butted up flush against the ledger.

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*Required spacing of 1/2 x 3 1/2-inch lag screw connecting southern pine ledger to spruce-pine-fir (SPF) band joist for residential deck joist spans. Assumes 40-psf live plus 10-psf dead load. Values are based on the root diameter of typical lag screws available at building supply stores. Attaching the ledger directly to the band joist with no sheathing in between provides the strongest mechanical connection with the fewest 1/2-inch lag screws.

Attaching Ledger Directly to Band Joist
Builders often attach the deck ledger to the band joist after structural sheathing is already in place. But it's actually stronger if you attach the ledger right against the band. In Detail 1, the reaction force of the deck joist is transmitted directly to the band joist by lag screws acting in shear. The band joist and ledger board are in direct contact, with no sheathing in between.

Deck loads and lag screw shear values. The building code design loads for residential decks...

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Read each tab carefully. Complete notes as you read the information and try the quizzes in the Notes and Quizzes section after each section. Click on the Overall Picture tab to tie the tabs together.

What you will be doing

In some ways deck building is a rather complex do-it-yourself project, but, since decks do not have to be leak proof or perfectly built, it is well within the scope of most novice builders. This book will provide you with the information you will need to do the work efficiently.

Deck building can be a demanding job both physically and mentally. It is, however, very rewarding. It moves quickly and will give you a pleasing living area for a small price.

Be sure you understand what you are doing before you proceed. The key things to remember in deck building are to be sure you have used all the proper materials and construction techniques, to fend off the decaying properties of water, and to be sure everything is level,...

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Last Updated May 08, 2017 12:21 PM


Over the past week I've ripped up the old decking and railings on our 12x15 deck, and installed new railings and all but the last two boards. Noticing that there was no ledger flashing, I pulled back the siding, and then noticed termite and rot damage behind the ledger board. I went to the basement, and cut through the drywall ceiling to inspect, and then verified that we have about a four foot section of rim joist affected. I saw no termites so presume this must be old damage. The four or so lag bolts through the ledger to this rim joist obviously weren't providing any support.

Behind the ledger board is a piece of old aluminum siding, so the deck was done when the old siding was in place and they didn't bother cutting out the siding, and didn't bother putting any flashing in place. Then later when the siding was replaced with vinyl, they didnt' bother putting flashing over the ledger...

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Deck joist layout procedure:

How to mark the locations for connecting deck joists to the ledger board and supporting girder for decks - design/build deck project guide. This article explains how to mark joist spacings along the ledger board for consistent, accurate deck or other floor construction.

We continue with advice on attaching joist hangers along the ledger board to make later joist placement easy and fast. This article series describes critical safe-construction details for decks and porches, including avoiding deck or porch collapse and unsafe deck stairs and railings.

Green links show where you are. © Copyright 2017, All Rights Reserved.

How to Layout Deck Joists - Wood Frame Floor Construction Procedures

Joists are the structural members that support the decking. The size...

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By Todd Fratzel on Decks & Porches, Framing

Deck Ledger Board Flashing Detail

Lately I’ve been seeing problematic deck ledger flashing details so I’d like to share with you my perspective on how to properly flash and secure your deck to the house. Properly flashing a deck ledger seems to be a lost skill with most weekend warriors…..let’s discuss how to properly secure the deck ledger and install the flashing.

Building a new deck isn’t really that difficult of a project. However, there are some details that must be followed in order to prevent premature failure of your deck and the area of your house that it’s attached to. The problem with attaching a deck to the house is it creates a great area to collect water. The intersection of the house and deck is extremely vulnerable to moisture problems.

As you can see from the diagram and the photo flashing must be done in layers. The best way to think about it to visualize what a drop of water will...

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Hi everyone!

Well, this is the Monday of all Mondays for me. I've been off playing for the last two months, building this!

I can't tell you how much we appreciate your patience with us over the last eight weeks, as our time has been consumed with our cabin project that we did for DIY Network. We are so thrilled to have an opportunity to share what we do with you in a new way, and can't wait ourselves to see how the show comes out. I'll be sharing as soon as I know when it airs - probably sometime this fall.

In the meantime, I'll be sharing with you on the blog how we built the cabin, and of course, all of the furniture and project tutorials.

I had hoped to be able to blog at night after working on the cabin during the day, but given the extreme time schedule, caring for our children, and the challenge of getting someone to put their life on pause to help us with kids, all while camping - well, let's just say I didn't think that one through to...

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Using the ripped piece of decking mentioned above, straddle the saw join with the cedar strip so that it is centred above the join. Draw a line along the right edge of the strip. See red dotted line in the diagram.

Measure your power saw edge guide. What is the measurement to the saw tooth closest to the edge guide? It should typically be about 1-1/4 inch. See yellow rectangle in the diagram.

Use a piece of scrap wood no thicker than 1/4 inch and tack the scrap wood onto the deck to the right of the drawn line a distance equal to the measurement of the guide to saw blade, and parallel to that line. See the brown rectangle in the diagram.

Make a cut from the vertice of the join to the centre of the deck. That's 1/8". put the cedar strip between the scrap wood guide and the saw. Make another cut. That's a total of 1/2" channel. You got it! proceed until you get close to the line on the left of the saw join. Insert the strip, or make another cut. BE CAREFULL....

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