Backing Plates against Ferro

[BlackWind]

Hi Folks, do we have any firm knowledge on what works as a good backing plate and mastic for ferro? I am looking to use 3/4" Ply, epoxied, and then glued on to the underside of the cement deck (I understand aluminium is the way to go but I have plywood at the moment). Some people have suggested using an epoxy and cut fibre mix to apply it or a silkaflex style adhesive to fix epoxy coated ply?

[Stumble]

I have zero experience with ferro boats, but my normal recomendation is to use G10 board for backing plates. I really don't like wood since it has a propensity to crush instead of spreading the loads.

[nauticalnomad]

Originally Posted by BlackWind

Hi Folks, do we have any firm knowledge on what works as a good backing plate and mastic for ferro? I am looking to use 3/4" Ply, epoxied, and then glued on to the underside of the cement deck (I understand aluminium is the way to go but I have plywood at the moment). Some people have suggested using an epoxy and cut fibre mix to apply it or a silkaflex style adhesive to fix epoxy coated ply?

depends on what you are securing on the otherside of the backup plate..
Whether your ferro boat is made with steel mesh or chicken wire.
Personally id use SS plate seperated from the hull with some type of medium.. Rubber matting etc.

[Snowpetrel]

My folks have used stainless plates, probably about 4mm on sikaflex. Its probably not optimal. Ideally G10 would be perfect. But its held the mast up for 40 years or so.


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[gbowen]

I used 3/16 steel plate and a bitumen mastic. Clean up with mineral turps and paint. Not yachty but work boat adequate. You must bed the fittings well. My boat was ferro and served us well for 3 decades.

gbowen