how about theese i jouist for stringers

[mxcobra]

I would cut the lower half off.
trim to fit boat and glass in.
they are very stroung I think 2 would work well for main deck suport - on a 19' cuddy
with 1/2 ply for all the other bracing'

 

[Woodonglass]

Re: how about theese i jouist for stringers

Not a good idea. Very difficult to glass, made from mdf chip board, not sure on the kind of glue used to produce them. I'd stick with what experience has proven to work. But... it's your boat and you're free to experiment as you wish. I'm just sayin I wouldn't do it for the reasons stated.

 

[Raystownboater]

Re: how about theese i jouist for stringers

Dont forget that the strength comes from the engineering of the joist as you see it. If you remove the lower half, you are compromising the integritiy of the stucture and it wont be as strong

 

[oops!]

Re: how about theese i jouist for stringers

i can see that you are looking for stregnth......and a manufactured beam is very strong.......BUT.

its osb and will fall apart in your boat.......engennered beams are not made with water proof glue.....the moisture....will make them usless in a short while.

plywood on edge.....glassed in....will support far more than you think it will.....its cheaper too

 

[jigngrub]

Re: how about theese i jouist for stringers

Yeah, they're not an exterior grade glue, and the OSB is crappy stuff anyway. If you could find some made with real exterior grade plywood and cut them down so you could use the top and bottom flange and double up the plywood web they would be killer!

 

[oops!]

Re: how about theese i jouist for stringers

that top flange would be fantastic for glassing and decking....just a little rounding on the bottom of the flange and bingo

 

[sje0123]

Re: how about theese i jouist for stringers

You could always just make your own out of the proper plywood and a wood cap.

Use exterior grade plywood then grab a piece of wood for the cap and run it down a table saw with a Dado blade (or router), epoxy pieces together then glass. Same concept, same result. A little more work but it's going to last longer.

 

[mxcobra]

Re: how about theese i jouist for stringers

I was thinking the osb version, becouse they are ready avalible and free.
You guys are right osb is not water proof by any means.
the older I joist when they first came out were made from plywood I may try and find some.....
or just do like sje0123 says