How to Frame a Floor System in Balloon Framing (Yes, It Hangs)

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How do you frame a floor system when the house is balloon framed?

In this video, I show how we frame a second-floor system inside balloon-framed walls by treating the floor like a deck—using ledgered LVLs, structural screws, joist hangers, and engineered I-joists to create a stiff, quiet, and over-designed floor diaphragm.

This approach raises a lot of eyebrows, but it’s fully engineered, uses deck-rated fasteners with higher load requirements than interior floors, and actually helps reinforce balloon-framed walls instead of weakening them.

In this video, you’ll see:

How to frame a floor system in a balloon-framed house

Why we use LVL ledgers attached with Simpson Strong-Tie SDWS structural screws

Why joist hangers and ledgered floors are more than adequate for residential loads

How continuous I-joists create a stiffer, quieter floor system

A simple bracing strategy for keeping tall walls plumb, straight, and workable

Using spare I-joists as laser-straight alignment tools

Why this floor system acts as a horizontal diaphragm, tying everything together

There’s a lot of fear around floors “hanging from ledgers,” but this system is designed for higher loads than a typical living space, and it’s engineered with safety factors that eliminate creep, squeaks, and long-term movement.

This is real-world framing on a real jobsite—focused on strength, safety, efficiency, and repeatable results.

If you’re a builder, framer, architect, or serious DIYer looking to understand balloon framing, modern floor systems, and engineered framing methods, this one’s for you.



0:00 - 0:34: Overview of the floor system in balloon framing.

0:34 - 1:19: Framing the walls.

1:19 - 3:58: Tips and tricks for framing the floor.

3:58 - 4:26: A comedic interlude.

4:26 - 5:55: Using laser tools for precision measurements.

5:55 - 6:44: Understanding the engineering behind the ledger system.

6:44 - 7:25: Installing the joist hangers.

7:25 - 8:50: Our approach to bracing balloon-framed walls.

8:50 - 9:39: Touring the interior of the house.

9:39 - 10:51: A brief ad for Squarespace.

10:51 - 11:34: A quick dance break and final check of the walls.

11:34 - 12:00: Measuring the ridge beam.

12:00 - 13:30: Preparing to set the ridge beam.

13:30 - 13:56: Trimming the ridge beam.

13:56 - 15:19: Rigging the ridge beam for the lift.

15:19 - 18:02: Precision placement of the ridge beam.

18:02 - 18:55: Another tour of the house with finished framing.

18:55 - 19:25: Plastering and aligning the remaining walls.


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