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Old 24 July 2017, 06:08   #1
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Rib Deck plyowood thickness????

Hi.
I am replacing the floor on my Halmatic Arctic 22 and need to know if it should be Lloyds reg marine 12 or 18mm plywood?
I cant be certain the timers were not replaced before.

Paul.
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Old 24 July 2017, 09:49   #2
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My 1991 Halmatic Pac 22 has / had a 9mm thick deck. It does have a number of 'by design' doublers under key parts.

I'm assuming that your underdeck structure is similar to the one in the photo.

I'm planning on using 9mm ply for the new deck with hardwood intermediates where I need to attach something solid.
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Old 24 July 2017, 10:18   #3
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Wow thanks for this! I have just uploaded some photos of my hull with part of the deck removed. (pic attached)
The floor on mine was 12mm but again I cant tell if from Halmatic or replaced later..
There does seem to be a lot of support beams so I doubt ill need 18mm anyway esp after seeing yours with 9.
also I notices on mine where something solid was affixed, they had 10mm aluminium plate underneath which was bonded to the underside of the ply and then drilled and tapped.
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Old 24 October 2018, 12:46   #4
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Hi may I ask what height was your transom? Mine is only 1” above the deck level
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Old 24 October 2018, 15:02   #5
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Quote:
Originally Posted by Autolux View Post
Hi.
I am replacing the floor on my Halmatic Arctic 22 and need to know if it should be Lloyds reg marine 12 or 18mm plywood?
I cant be certain the timers were not replaced before.

Paul.
You may find Martini's old build thread of interest...he did an Halmatic from Hull up-& Stem to Stern!
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Old 25 October 2018, 13:31   #6
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Ok brilliant, where’s the thread?
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Old 26 October 2018, 03:12   #7
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I used 18mm but there actually 12 possibly 8mm Click image for larger version

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Old 26 October 2018, 03:13   #8
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12mm glassed both sides would be my choice if doing another one with 450gsm it's going no place in a hurry
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Old 26 October 2018, 03:22   #9
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Ok well I may of overkilled in Mine as I used 12.5x2 and glass on the top
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