Choosing wood for a wood/glass Chris Craft Coho

[PAR]

They had several wooden crews needing to stay busy. Skilled workers are hard to find and keep. A 'glass hull shell and molded deck cap, as is typical of modern craft requires less skilled workers, after the molds are made, so you'd lose this expertise if you went all 'glass. Many ended up in the finish carpentry department, but most just got laid off.

Your deck was likely covered with canvas and painted originally. This often gets pulled up and just painted, which quickly kills the deck. Once you start digging into the deck, you'll find good spots, but a lot more bad spots then you can see now. It's usually easier just to rip it all off and lay a new plywood deck over freshened beams and carlins.

[seven up]

Ok to put on some tunes first?


[www.youtube.com/watch?v=ft82a4qZZ9E]


MDO plywood is my new favorite. A couple of sheets were used to protect a plywood shipment. Alot less fairing before finish coat. And razor sharp edges.

For framing an aft well and a couple other spots we layered 1/4" Okume with epoxy and staples. For a 2x2 frame it would be 8 layers of 1/4". A 4x8 sheet would yield 3 2x2 8 footers.
This one is 1 1/4" thick, 2" wide, 98 1/2" long.


I've been thinking to use a fir plywood cores and mahogany outer layers for brightwork.

So F14, Surely I'm NOT telling you to do it this way. Just some other options to look at. The boat that is being finished up, here, in the next couple of years, I knew when I started that no one would want it when finished so it didn't bother me to change things around to my liking without sacrificing safety.

It was pretty overwhelming at first.

[F14CRAZY]

Am I correct that "MOD" plywood is equivalent to "exterior grade" plywood?

[seven up]

The long name is Medium Density Overlay. MDO. The type used for outdoor signage. There may be an interior version although I haven't come across any.

[PAR]

If you mean MDO then no, MDO is the APA1-95 grade (marine), which is better then the three construction grades, typically used in land based housing. MDO (again) has fallen dramatically in quality in the last decade and I can't recommend it for planking any more. It's fine for lightly loaded stuff, bulkheads and furniture though. It's rosin coated paper makes painting very nice too. If looking to use a cheap construction grade, see if your local lumber supplier can order some T 1-11 for you. This is typically grooved, but can be had without them. One side will be rough, the other typically a C or D surface, but it's got a good core and is a WBP adhesive. It still has a low veneer count and voids, but it's a better sheet then the typical "X" grades. Of course it'll need more effort to finish, but with a Xynole, Dynel or combi-mat sheathing, it'll do fine.

There is no interior version of MDO. It's all APA 1-95 grade and available in limited thicknesses.

[F14CRAZY]

Thanks for the better explanation. I googled it quick at work so I didn't get a good idea of what it was

[seven up]

It's all good.

It was this stuff. APA spec. Ps1-07, rev. Ps1-09.

http://www.harborsales.net/tabid/130...ductTypeId=135

and using this http://www.doitbest.com/Wood+stain+a...sku-793259.dib

if the installation required. And each one has safety precautions for handling.

Presto ! Homemade treated MDO. Without the copper dust.



Best of Luck with your project.

[PAR]

Originally Posted by seven up

It's all good.

It was this stuff. APA spec. Ps1-07, rev. Ps1-09.

http://www.harborsales.net/tabid/130...ductTypeId=135

and using this http://www.doitbest.com/Wood+stain+a...sku-793259.dib

if the installation required. And each one has safety precautions for handling.

Presto ! Homemade treated MDO. Without the copper dust.



Best of Luck with your project.

What are you talking about?

[seven up]

The APA1-95 specification was revised to voluntary standard ps1-07 and later to ps1-09(in 2010).

Otherwise, the panel listed above in the website link was the panel I've used. And was impressed by its' stand alone characteristics(1/2" 2-sided brown)

And may or may not be useful for satisfying F14's original query ...help choosing wood:

flybridge deck

windshield framing

saloon corners

side deck cores

base of interior side windows

cockpit deck supports

saloon sole



Any progress or pictures to update us F14 ?

[F14CRAZY]

Thanks for the discussion...choices are a good thing And yeah, all those areas listed are in need of attention, pretty much. Not much new progress aside from slowly getting the cabinets out of the salon. This is in a newer thread I made because I actually noticed how the cabinets were sloping outward (towards the sides of the hull) with how bad the sole has become. Leaking windows, leaking flybridge deck, leaking side deck to window base joint...its seen a lot of neglect but I'll turn things around. There's some pix in that thread if you're curious