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    Posted: 02 Nov 2025 at 7:37pm
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Just looking at replacing a wooden floor in an aluminium boat. Should I line the aluminium stringers with a thin strip of rubber before laying sheet of chequer plate?? 
Logic would say yes....any thoughts??
Thanks in advance.
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Post Options Post Options   Likes (0) Likes(0)   Quote krow Quote  Post ReplyReply Direct Link To This Post Posted: 02 Nov 2025 at 7:50pm
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I wouldn't as any salt in there will trap between and cause corrosion. 
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Post Options Post Options   Likes (0) Likes(0)   Quote bricker Quote  Post ReplyReply Direct Link To This Post Posted: 02 Nov 2025 at 9:47pm
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Good point!!! Metal to metal it is đź‘Ť
Thanks for that.
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Post Options Post Options   Likes (0) Likes(0)   Quote bricker Quote  Post ReplyReply Direct Link To This Post Posted: 02 Nov 2025 at 9:51pm
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On the subject of the type of chequer plate, some suppliers stipulate “marine grade”. What does marine grade denote in terms of spec and quality?

Secondly, there’s clearly a balance between thickness and weight. One of the motivations is to cut down on weight, so would 2.5mm be thick enough…….supporting stringers are 20cm apart.
Cheers
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Post Options Post Options   Likes (0) Likes(0)   Quote krow Quote  Post ReplyReply Direct Link To This Post Posted: 03 Nov 2025 at 8:07pm
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Sorry don't know. When I had to replace my wooden floor (previous boat). I worked out ply and sealer and paint was around the same as alloy so just replaced with ply.
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Post Options Post Options   Likes (0) Likes(0)   Quote bricker Quote  Post ReplyReply Direct Link To This Post Posted: 10 Nov 2025 at 6:18pm
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Next question - is the use of ploystyrene blocks under the floor for sound dampening, or insulation or both........or something else? Just lifted the old wooden flooring and there are fairly random bits of polystyrene beneath. I presume just put back and fill the gaps with new??
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Post Options Post Options   Likes (0) Likes(0)   Quote Pcj Quote  Post ReplyReply Direct Link To This Post Posted: 10 Nov 2025 at 6:21pm
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Originally posted by bricker bricker wrote:

Next question - is the use of ploystyrene blocks under the floor for sound dampening, or insulation or both........or something else? Just lifted the old wooden flooring and there are fairly random bits of polystyrene beneath. I presume just put back and fill the gaps with new??
Flotation blocks??
"Times up"
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Post Options Post Options   Likes (0) Likes(0)   Quote krow Quote  Post ReplyReply Direct Link To This Post Posted: 14 Nov 2025 at 9:04pm
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Yes was for flotation. I think back in the day it was an easier sell if the hull would float. I removed all of it on my Ramco as the salt would build up between the blocks and the hull. Stuff looked like soap but wasn't. I'd suggest if you are keen to leave it in there then wrap it in cling wrap to stop contact to the hull. Also beware when adding more as some polystyrene isn't waterproof. 
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Post Options Post Options   Likes (0) Likes(0)   Quote Kandrew Quote  Post ReplyReply Direct Link To This Post Posted: 14 Nov 2025 at 9:42pm
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Some guys have used empty plastic bottles with the lid screwed on tight
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Post Options Post Options   Likes (0) Likes(0)   Quote bricker Quote  Post ReplyReply Direct Link To This Post Posted: 28 Nov 2025 at 9:42pm
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Thanks everyone for the replies. I think I'll leave the polystyrene out of the equation .
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Post Options Post Options   Likes (0) Likes(0)   Quote bricker Quote  Post ReplyReply Direct Link To This Post Posted: 28 Nov 2025 at 9:43pm
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thanks
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Post Options Post Options   Likes (1) Likes(1)   Quote Kandrew Quote  Post ReplyReply Direct Link To This Post Posted: 29 Nov 2025 at 9:59pm
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I wouldn’t all boats need flotation.
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