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Old 04-29-2019, 09:37 AM
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Default What gauge tubing for floor frame

Was wondering what size and gauge tubing everyone is using for framing a new floor and trans tunnel? Want to cut out the old floor and build a new one. Also going to redo part of the firewall. Thanks and any help is really appreciated!
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Old 04-29-2019, 09:44 AM
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A properly formed sheet metal floor or tunnel doesn't require a tubing "frame". I see a lot of builds waste often-precious space with a bunch of intricate framework that is completely unnecessary.
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Old 04-29-2019, 10:13 AM
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I typically use 1/8" for flooring support.

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Old 04-29-2019, 06:35 PM
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I'm with BED
I don't use any frame work on my floors and firewalls. I use 16 ga. sheet metal on all the floors I do and weld it all together.
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Old 04-29-2019, 08:16 PM
kenny c kenny c is offline
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If you're worried about oil canning, put a few beads in it with a bead roller and don't worry about the framing.
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Old 04-29-2019, 09:33 PM
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I bought a bead roller but havenít taken it out of the box yet. Anyone have any pics or links to ones they have done without framework?
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Old 04-29-2019, 10:11 PM
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Not the best picture, but zero tubing in this Model A Roadster floor...
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Old 04-30-2019, 07:03 AM
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I use 16ga hot rolled for the floor. It is softer, easier to work, and has a stronger weld than cold rolled. No structure underneath the floor, although it is bolted to frame cross bracing in a couple of places.

The floor cross pieces in the pic are primarily for seat mounting points, but also add considerable strength.

Welding in the trans tunnel today.
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Old 04-30-2019, 11:20 AM
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I used 1/2" treated plywood for the whole floor in a '36 Ford truck. There is a light wall rectangular tube across, under the floor, between the frame rails, and about directly under the seat front, [near the top of the picture]. I've been driving this truck for a few years now and don't feel any problems coming on.
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Old 04-30-2019, 07:37 PM
kenny c kenny c is offline
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I used 1/2 X 3/4 X 1/16 wall rectangular tubing just to have a frame to work to. I didn't have access to a brake at the time.
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