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druidwood 03-17-2018 03:00 PM

covering ribs with plywood
Hello. I have seen a couple of pictures of people who covered their ribs with wood so they could attach the ceiling without forming a thermal bridge. Running wood front to back would be easy, but figuring out how to do it side to side has me stumped. How did they get the wood to bend. Is there a type, thickness of wood that works? Do you score the back? If you have prepped your ceiling in this way can you please let me know your technique? I plan to put 1/4" cedar tongue and groove on the sides and decorative tin down the center. Thanks.

Dizzyman 03-17-2018 04:33 PM

There are several ways but if I understand your question correctly let me direct you to Curious George’s build thread, he had a novel method.

His build thread is:

Look for the last pic in post #289.

Mgulley82 03-18-2018 08:46 AM

We used plywood

Episode 6 - Skylights, Furring Strips and Random Fun

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druidwood 03-18-2018 01:19 PM

Thanks MGully82. You have lots of good helpers there! I see your post was recent, and was wondering what you planned to use for the ceiling and if you have started that? Was going to do cedar tongue and groove on the sides and wondered how pieces would lay across 2 furring strips (since angled) or perhaps the trick is to make them the same width as the tongue and groove so each piece sits flat? Not sure the tongues and grooves would line up though. Or maybe using that adhesive insulation strips cut to lay front to back between the two pieces to sort of smooth it out?

I hope someday to replace the escape hatches with opening skylights (this will be how I get on the roof) so that was of interest too.

druidwood 03-18-2018 01:23 PM

Thanks Dizzyman. Another way to go attaching to side of ribs.

Mgulley82 03-18-2018 03:38 PM

We are installing pine tongue and groove. I assume I may need to modify the tongue and groove a bit around the initial tight radius. Also the first three sections of the curve are with pieces of plywood the same width as the tongue and groove so hoping that helps.

We will be spray foam insulating the roof

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dbhost 03-19-2018 12:45 PM

I haven't done it myself in a bus, but I have done curved ply faces on furniture in the past. The process is done one of a couple of ways.

#1. Steam bending.
#2. Kerfing.

Both have advantages and disadvantages. For a bus ceiling. I would probably line up firring strips front to back, and then insulate, and lay in thin, like 1/8" ply veneer, using something like a Vicks Vapo Steam machine, just get the interior good and steamy, and apply the ply / veneer to the ceiling...

I believe Steampunk Steve on Youtube did something like that in his bus build. Awesome series to watch if you want to get some ideas...

trueheart 03-19-2018 01:04 PM

I've been told you can buy bendable plywood. It's apparently made by glueing all the layers with the grain running in the same direction, I think. I'll be checking it out for my ceiling, as well, and plan on running it side to side.

Twigg 03-19-2018 02:28 PM

Couple of thoughts ...

First is that the "bendy" plywood is $75 per sheet!

The way I plan on doing this is by ripping 8 x 4 sheets of ply into 2" strips.

The first strip will cover the bulk of the ceiling rib (all except the tight curve), and be glued and screwed to the rib. I may or may not add some insulation there too

Then two subsequent strips will be glued to the first one. That should give 3/4" to fasten into and break the thermal bridge about as well as I can.

It's not necessary to cover all of the curve, so short strips can be added to the sides in the same manner.

o1marc 03-19-2018 02:43 PM

I'm envisioning band saw cut pieces for the curves of the rib and straight pieces (2x2) for the long runs and then securing them to the sides of the ribs before insulating. That way I lose no roof height adding another sunroof. The ceiling material will attach to the side of the ribs, wood to wood.

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