Cabin Wall Replacement @ Port Lights

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  • June 30, 2013 8:56 AM
    Reply # 1330145 on 1325045
    Deleted user
    Carl - Perhaps someone else has a better explanation, but I have been told that the difference between "marine grade" and normal "exterior grade" plywood is that marine grade will not contain any voids in the layers, where exterior grade will.  You will readily see voids in exterior plywood when you cut it.  The glues are supposedly the same. 
  • July 01, 2013 3:53 AM
    Reply # 1330509 on 1325045
    As Mike indicated, the lack of voids in marine grade is one of the most important difference between the two. Marine grade will also have more (and thinner) laminations. This adds strength to the marine grade, but you shouldn't need the additional strength for this application. At one time, the glues were different, but as long as you buy an "exterior grade" plywood, it will have the same waterproof glue today. And some marine grade plywoods, of courese, are made of mahogany (as was most of the ply used during the original construction).

    Neither marine grade nor exterior grade should delaminate with limited exposure to water, but either will delaminate with extended exposure to water. So, I see no advantage to the use of marine grade, unless you are purchasing mahogany, to be varnished (which you are not). The key to avoiding delamination, of course, is to make sure that there is nowhere for the water to get in. When you do this job, you should probably re-bed your ports. If you choose to use the Parkland product I suggested, and if you put it over new ply, and it your ports are properly sealed inside and out, and if your ports have good gaskets ... there should be no place for the water to come in. Even if you forget to close the ports from time to time, you should still not get any delamination, provided the trim at the bottom of the panels is sufficiently sealed where it meets the  dripledge / handrail.

    My guess would be that 1/4" ply would give you all the strength you need, yet it will still give you the rigidity to make your finished panels smooth. I'm not sure, however, if they make 1/4" ply in an exterior grade. 

    If you use the Parkland product, glue it to the plywood while the panel is laying flat (with the proper, non-volitile glue) and before mounting the panel to the wall. To make sure you have the holes cut correctly, you could even "dry mount" the panel and mark the holes from the outside, through the port light cutouts. Then take the panel down again and cut the holes.

    Good luck with your project. I'm sure it will look great!

    Last modified: July 01, 2013 4:11 AM | Anonymous member
  • July 01, 2013 8:35 AM
    Reply # 1330645 on 1325045
    Deleted user
    Just some thoughts

    1.) using thicker (like 1/2") ply brings the outside edge of the port lite inboard. (sticks out less and is less of a knee knocker)

    2.) I installed mine in several sections and used teak bibs (covers for the seams) you may be able to see them in  they are the darker wood above and below the port lite. 

    3.) So I do not have to redo them I epoxied all sides and edges of the 1/2" baltic birch ply before sticking them up. The port lites have 4 bolts in each pc on each end. and I used a router to give the tung and grove look to them before the epoxy.

    as an after thought I would have routed out some lighting areas on the back sides to reduce their weight.

    Just an option

    better pic
    Last modified: July 01, 2013 1:58 PM | Deleted user
  • July 01, 2013 9:19 AM
    Reply # 1330701 on 1325045
    Deleted user
    Thanks guys,
    All good bits of information.
    I was thinking about adding some insulation under the plywood.
    Any opinions?

    The link isnt working. Any email pics?
    Maybe its just that I use an ipad because there is alot of stuff on this forum that I dont have access to view.

    Last modified: July 01, 2013 3:03 PM | Deleted user
  • July 01, 2013 1:54 PM
    Reply # 1330917 on 1325045
    Deleted user

    There were two links.
    the fist works on all (Pad chrom firefox etc etc. if you have a web connection as it is off my web site)

    it may be a little hard to see but you should be able to get the idea.

    the second one requires you to log into a account (I have not tried that on an I-pad so you may have to wait until you get to your computer to look at that one)  There are other pic in the yahoo group (Mine and many others) so take a look  just go to yahoo look under there groups for westsail and it is the one with a guy using a sextant on deck mid ocean.  then look under /photos/sv Imagine/

    Direct link but you need to sign in to yahoo.

    lastly in a land with no privacy (not sure about putting your e-mail out there big and bold) ????

    I think many of us will regret our casual release of personal info in the years to come?


    P.s. it is yahoo but feel free to add to anything on the yahoo group (it was set up along time ago when that WOA went down)  (kind of quite now) also Jay check in on it often to approve members (I am not so fast on that account but Jay is : )

    Last modified: July 01, 2013 2:00 PM | Deleted user
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