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Old 26-07-2022, 15:09   #1
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Sagging ceiling

Had a soft spot on my cabin roof, got it cut out and almost cleaned out. If I brace it up from the underside and epoxy a sheet of heavy biaxial cloth, would that keep the ceiling from sagging when I remove braces? Or do I need to replace core and epoxy outer laminate skin back on before removing braces?
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Old 26-07-2022, 15:30   #2
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Re: Sagging ceiling

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Originally Posted by Andrew6305 View Post
Had a soft spot on my cabin roof, got it cut out and almost cleaned out. If I brace it up from the underside and epoxy a sheet of heavy biaxial cloth, would that keep the ceiling from sagging when I remove braces? Or do I need to replace core and epoxy outer laminate skin back on before removing braces?
The core must be firm and well glued to both skins in order to provide rigidity.

I recommend leaving the bracing in place until after the core has been replaced and the top skin is on.
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Old 26-07-2022, 15:33   #3
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Re: Sagging ceiling

You may want to consult with a naval architect. This is a structural issue.
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Old 26-07-2022, 16:41   #4
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Re: Sagging ceiling

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You may want to consult with a naval architect. This is a structural issue.
You don't need a navel architect to rebuilt a portion of a sailboat deck. This is not a design issue, it is a build issue.

We have to assume a naval architect was involved when the boat (including deck) was originally designed. Just duplicate what was there previously. How you hold it in place while you re-construct it is common sense.
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Old 26-07-2022, 17:37   #5
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Re: Sagging ceiling

The ceiling is the part you walk on down below wot you look up to inside is the deck head ,I would clean and epoxy fill the seams before a couple of layers of double bias in epoxy on top ,leave moulds or props inside for at least 24 hrs .⛵️⚓️
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Old 26-07-2022, 18:11   #6
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Re: Sagging ceiling

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The ceiling is the part you walk on down below wot you look up to inside is the deck head ,I would clean and epoxy fill the seams before a couple of layers of double bias in epoxy on top ,leave moulds or props inside for at least 24 hrs .⛵️⚓️
"Ceiling" is fore-and-aft planking that is installed on the inboard faces of the frames in a wood boat, also the term is applied to fore-and-aft strips that are used to hide the inside surface of a fiberglass boat.
When you "look up", that surface is called the "overhead".
The part you "walk on" is called the "sole".
It's quite simple, when standing down below, the "sole" is under the "soles" of your feet, and the "overhead" is "over your head".
A couple of layers of double-bias will have very little resistance to bending.
Now, if we can introduce some carbon fiber some distance away from the neutral axis, we can start to gain some rigidity.
Rigidity is gained by separation of the inner and outer skins.
What goes between them to effect that separation can be any number of what we call "core" materials.
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