Author Topic: New caprail and external chainplate project started  (Read 295 times)

Doug Vaughn

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New caprail and external chainplate project started
« on: January 27, 2020, 08:51:29 PM »
I have begun the long and tedious job of replacing the chainplates as well as waterproofing and replacing the caprail. The port side is about 95% done. The current chainplates were left in place on the interior and used as backing plates for the 8 carriage bolts used to secure each of the exterior 1/2" new ones. The real challenge was drilling the 24 1/2" holes through the backing plates. I went through 9 carbide drill bits before it was done (and I've just got the port side done!). This of course required the interior cabinetry to be removed for easy access. I will also be replacing the white oak marine ply as it was well worn from the years of the slow leaks from both the chainplates as well as the stanchions.
The cap rail had been refinished so many times there was but a fraction of the original teak left to maintain. I decided on a radical solution, 1" thick PVC decking with a 50 year guarantee. https://www.timbertech.com/products/decking/azek-vintage?option=Cypress
This product had to be bent to the curve of the boat so a heated steam bending setup was made. 240 or so degrees was the right temperature to make it pliable. First though the old adhesive had to be removed, heat and scraping worked but was a slow effort. Once sanded and prepped, 2 coats of light fiberglass cloth and thickened epoxy sealed the entire length of the cap rail. After fairing smooth and ensuring the water tight seal, 3M 5200 was liberally applied to the rail where the new decking was installed. A special system using 316ss screws with matching plugs keeps the new cap secured.
I only have to fill some small spots with matching filler and the port side will be done. Then onto the starboard side!!
I've tried to add pics but seems the files are too large. You can check out my dropbox folder here:
https://www.dropbox.com/home/CSY%20Chainplate%20caprail

Soggy Paws

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Re: New caprail and external chainplate project started
« Reply #1 on: January 28, 2020, 10:34:47 AM »
Hi Doug,

I did a similar replacement of chain plates and cap rail about 20 years ago.  Description and pics here on our website:
http://www.svsoggypaws.com/CSY/rig.htm#Chainplates

Dave
CSY 44 Walkthru #35, Soggy Paws
Soggy Paws the CSY has been SOLD
http://svsoggypaws.com/CSY/For_Sale.htm

Doug Vaughn

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Re: New caprail and external chainplate project started
« Reply #2 on: January 30, 2020, 11:45:09 AM »
Dave,
When you replaced them with the exterior ones, did you keep the old interior chainplate for backing plates? I saw where you used slotted toe rail to finish off the caprail just as Jules has done on his 44. I would have preferred to go that route but the availibilty of it is very limited. I stumbled upon the synthetic decking idea after seeing it used on a power boat.
Doug

Soggy Paws

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Re: New caprail and external chainplate project started
« Reply #3 on: January 30, 2020, 09:13:15 PM »
Doug, I did not use the originals as backing plates.  I had pulled them earlier and they were badly corroded.  The slotted alum rail was available through a Miami aluminum extrusion company.  I did not install a new caprail but rather multiple layers of fiberglass.  All that should be on our website.
CSY 44 Walkthru #35, Soggy Paws
Soggy Paws the CSY has been SOLD
http://svsoggypaws.com/CSY/For_Sale.htm