I-Beam Replacement Project Summary

Dec 28, 2015
1,850
Laser, Hunter H30 Cherubini Tacoma
I bought the boat 3 years ago knowing the I -Beam was needing replacement. I have been battling a water leak from the mast base into the cabin via the mast wires. Knowing the water isn’t just going into the cabin but also into the core, I needed to address it. Both required removing the compression post so that’s were my story begins..........
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Compression Post Removal
I loosened up the rigging and jacked up the roof with a assortment of screw and bottle jacks. This process and the following “jacking" was by far the most challenging. Spreading the load, lifting as close to the mast plate but having room to work is a pain. I got it to were I could sledge the post out. I believe this is not the original post as it is larger than I’ve seen in pictures and it is rabbited into the bulkhead. No rot anywhere but the plywood it sits on was crushed and it was obvious the post was not sitting plumb on it.
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Mast Wire Leak
The original hole was 1 inch. I increased it to 1.5 by pulling the wires up through the cabin and out the mast via a 1.5” hole in the side of the mast by the base plate. I then enlarged the hole. I took a thick rubber chemical glove and cut a hole in the middle finger and ran the wires through it, zip tied it and put a bunch of butyl tape up in the finger then zip tied the other end of the finger making a seal. I ran the wires back through into the cabin then threaded a section of 1.5” plastic conduit around the wires and up into the hole making it flush with the cabin ceiling. I then spent the next hour placing 3m 4200 around the conduit with a wire coat hanger, not fun. I then pulled the cuff off the glove over the conduit and prayed it wouldn’t leak. Good news it didn’t.
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IBeam Removal
I took my HF multitool and a handful of blades and cut the perimeter of the fiberglass encapsulating the steel. I believe the I beam is original but the fiberglass isn’t, let me know if this isn’t true. Probably installed when the compression post was replaced. I cold chiseled it all of and cut the vertical and top off with my angle grinder, then removed the base exposing about 4 inches of resin filler as the base for the I-Beam. Cleaned it all up and painted the bilge in that area. Found the front vertical section of the I-Beam rusted through and the fiberglass was actually holding it all up.
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New I-Beam
I went back and forth on what to use and went with a product called PaperStone. It is a phenolic composite used for countertops and other stuff. I’m very familiar with it being I fabricated all of the countertops in my house with it. I expoxied the layers together then drilled vertically through it in two places and expoxied two sections of 7/16 all thread for lateral strength. I fabricated a new plate for the compression post to sit on and screwed it to the new IBeam. I mixed up a bunch of West Systems epoxy with a bunch of compression filler powder to the consistency of cookie dough and set it all into it. Having it all screwed together set the correct elevation once placed in the ledges off the bilge. Once it started hardening, I was able to shape it with my finger. .

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Last edited:
Dec 28, 2015
1,850
Laser, Hunter H30 Cherubini Tacoma
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Compression Post(s) Installation
The ceiling in front of the mast base plate was sagging. The bottom 1/8 “ of the plywood in front of the wires hole was soft and the original design only supported the mast from the rear of the plate to about 2/3 forward. Knowing I have some rot (my next project) I wanted to support the mast as far forward as possible. I placed a 8x12x5mm Carbon fiber plate on the ceiling then placed the original (to me) compression post. I was hoping this would support the ceiling enough but it didn’t, helped but not enough.
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Compression Post #2
The big challenge is the sliding door. I either was going to delete it and install an additional post in front of the original and screw then together or come up with a harder way. I had to pick the harder way......
I milled up a hard maple post (highest compression material I had in my shop) and screwed aluminum channel to both edges. I installed it about 1.5 inches forward of the original and bulkhead. This gave me just enough room for my door to side between both posts. Modified the structure for the door track and installed. Next is to mill filler due to the channel (I didn’t feel like recessing it) then mahogany wrap. I planned on bringing the post back home with me to do this but decided I had had enough of jacks and 2x4s. I’ll get the pictures of it done when I get there.
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Last edited:
Dec 28, 2015
1,850
Laser, Hunter H30 Cherubini Tacoma
Sorry for the sideways pictures. I can't seem to figure out how to rotate them.
 

dLj

.
Mar 23, 2017
3,414
Belliure 41 Sailing back to the Chesapeake
Wow, nice work! How long did it take you do get it done? Why didn't you go with a stainless steel I beam? Just curious.

dj
 
Dec 28, 2015
1,850
Laser, Hunter H30 Cherubini Tacoma
Wow, nice work! How long did it take you do get it done? Why didn't you go with a stainless steel I beam? Just curious.

dj
I don’t have any stainless on hand and I don’t have the right gas mix for my MIG. I considered it, should have gone with it for the second but I want to finish it up.

I took a half day to loosen the rig, remove the post and I-Beam. 1/2 day to figure out the new IBeam and fabricate. 1 day to prep the bilge, set the IBeam and do the mast conduit (long day). 1 days to figure out the CF plate, make the trim beading, set the main post and stare at it figuring out the second post. 1 day to remove/reinstall the main post, install/remove/reinstall the second and clean up. I’ll have a half day into milling and installing trim for the second. The boat is about 35 minutes away, one way. The big time sucks were; working around wet bilge paint and wet epoxy, figuring out how toJack up the roof to get the posts in then trying to get the bead/welting in and looking for shit I sat down in a destroyed cabin.
 

dLj

.
Mar 23, 2017
3,414
Belliure 41 Sailing back to the Chesapeake
So about a week. Not bad really. There is a lot to do in all that... Should be great once it's all done. Can't wait to see the final photos - gonna be real nice!

Reminds me I have to clean, zinc coat and paint my I beam so I don't have to go through the same work...

dj
 
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Likes: MikeHoncho
Dec 28, 2015
1,850
Laser, Hunter H30 Cherubini Tacoma
Got down to the boat today for a little work. Shimmed out around the aluminum channel with 1/8” poplar then on went the mahogany then plugs.
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