Transom replacement

[RidgeRunner]

I agree that mat should not be the only material used for the transom but wouldn't you agree it is still ok to lay woven roven into a couple layers of mat, the old school way . Many of the stitched up multi directional products available today were not even invented when these boats were made. Mat can be your friend, hardware cloth on the other hand is more for surfacing IMO.
Marine grade plywood is nothing more than fir with exterior grade glue and cores with less voids. It can be pressure treated and dried after treatment or it can be purchased untreated. It can be laminated with vinylester resin but the surface is too smooth for much penetration so you have to rough it up with 60 grit to get a good bond. I know of several boat manufacturers that thin the first coat of resin when using the marine plywood for better penetration. They refer to it as a hot coat.
I prefer composite cores but they are high $$$$

[Joker2]

Thanks for your input. I have to make up 1-1/4" of transom wood was planning on the 3/4" marine ply that I already have, and can get my hands on some 1/2" cdx ply. Do you think this is ok to mix two different types of ply? Should I glue and screw them together or just glue? I saw some other guys made their transoms out of three pieces I have to do the same so I can get it to fit in. I was thinking of offsetting the seems between the 3/4 and the 1/2 for strength, what do you think? Also I have another post up with more pictures of the old Bilge area, any ideas on that? Thanks a lot for your thoughts!

[nymack66]

Sorry for my ignorance meant cloth not Mat old habits die hard :)

[captpete13]

when I replaced the transom on my boat it had 2 layers of 3/4 plywood. I replaced it with 3 layers of 1/2. I figured the extra layer of epoxy would help. Plus the thinner plywood follows the curve of the transom better.

[Skools Out]

for the transom in my Sea Ox project i'm using 1 3/4 treated kiln dried 26 ply plywood.

[captwalt]

Do you meen 1 sheet of 3/4 or 1 3/4 in thick.

[awthacker]

26 plys I'm thinking 1-3/4 inches thick.