Thanks to all ye Rhodes for your fine advice. I appreciate you all taking
time to advise.

Allyn, I am going to leave my mast and compression post offset, it was good
for 36 years and it will be good for many more years to come.

My head floor is about 3 inches higher than the cabin floor. The
compression post straddles both floors, 2/3 on the higher head floor, 1/3
on the cabin floor. I have fresh air immediately underneath the compression
post, and the sagged decking.
I am going to attach a picture, hopefully successful. I am going to take
all the advice, adding vertical support all the way down to the hull.

I may lower the head floor to match the cabin floor, inspired by Peter.

Allyn, you have a unique situation. The concrete may be for ballast as
well. I will be scared to blast the concrete away. I probably will build up
from the concrete to support the head floor and the compression post. The
OSB was probably for forming the concrete. But stay turned for other fine
advice.

patrick




CompressionPost.jpeg

On Sun, Mar 7, 2021 at 2:05 PM Allyn Baskerville <allynb at adsne.com> wrote:

> Patrick, I’m working in the same area as you are.
>
> Q1: I have a 2003, and the mast and compression post are offset as you
> describe. I’m considering making a compression post that extends to under
> the mast.
>
> Q2: I don’t follow what you say about the notch. Look at my post from
> earlier today, and they are three pieces of wood that form a box partially
> filled with concrete to support the compression post. The center piece in
> is immediately under the compression post but wasn’t mounted correctly (too
> low) to support the weight of the mast. With no support under the
> compression post, the plywood decking sagged and started cracking. There
> needs to be support under the compression post. The OSB (!) wood in my
> support is not treated in any way.
>
> Sent from my iPhone
>
> > On Mar 6, 2021, at 4:08 PM, Patrick Cheung <chitakcheung at gmail.com>
> wrote:
> >
> > ?Dear Rhodies,
> >
> > I am seeking advice from you all.
> >
> > The compression post is sinking approximately half an inch. I removed
> both
> > floors in the main cabin and in the head area. Both plywood floors
> clearly
> > sagged with the weight of mast and compression post resting on it.
> Sitting
> > at the companion way one day, and staring at the mast and compression
> post,
> > I noticed they don't line up, the compression post is about 2 inches to
> the
> > starboard.
> >
> > Question 1: Does your mast and compression post line up?
> >
> > Question 2: Compression post is notched, 2/3 sitting on the head floor,
> 1/3
> > sitting on the main floor, and there's no support immediately under the
> > compression post. Is it advisable to add support under the compression
> > post, all the way down to the hull?
> >
> > Since I own the boat, the shrouds are always hand tightened.
> >
> > Thank you in advance for your advice,
> >
> > Chi Tak,
> > Duck
> > Lake Simcoe, Ontario
>