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  • transom and floor replacement

    I have a 1990 15' larson all american 150 that I bought this past summer. The center of the floor was "soft" which I knew when I bought it but it was a good deal and replaceing a floor cant be that bad right? Well a couple weeks after buying it and getting my 1966 johnson 60hp running ok i pulled the soft plywood that was covering the soft floor in the center and found it was real soft so i made a temporary "better" patch job just to get thru the summer. It worked and I had alot of fun with the boat. Well now that the season is over it's time to get to work. I pulled the cap off the boat using my engine crane and pulled the boat in the garage to do the work. I used an air powered angle grinder to cut the fiberglass and pulled out the rotted plywood floors. I also noticed cracks in the transom so i investigated and found it was soup. so i cut the inner wall out and pryed the wood out. than I fiberglassed in a piece of laminate and cut a wooden backer so i can pour in seacast. I also spent some time here and there buffing out the side of the boat. ok that pretty much brings me up to where I am at. Sorry I havent gotten pics up to this point but I have been busy reading Oops's extension and now I want to document my work as he has. As soon as I figure out Photobucket I will post pics
    sigpic
    Buy American

    1993 Ford Thunderbird rebuild
    http://www.cardomain.com/ride/3351730

    1990 Larson All American 150
    https://forums.iboats.com/showthread.php?t=358025

    If its worth doing, it's worth doing right

  • #2
    Re: transom and floor replacement

    Sounds good, can't wait to see pics.
    Me and "The Lost Cause" 1975 trihull project.
    https://forums.iboats.com/showthread.php?t=341563


    Hijack thread - Courtesy of HVAC Cruiser
    https://forums.iboats.com/showthread.php?t=360893

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    • #3
      Re: transom and floor replacement


      Here is a pic of where she sits in my garage

      Here is where I cut a piece of laminate to the shape of the tansom and fiberglassed it in place (hopefully water tight)

      Here is where I will pour the seacast in. I like how the base under the swim platforms makes a nice funnel shape into the transom.

      The stringers seem pretty solid so I think I will just clean off the remaining floor from the top of them and seal the top of them with fiberglass.

      A good picture of the remaining floor which I havent gotten to yet.

      Ok here is my first question. There is thick foam on the sides which is covered on the inside with fiberglass. well alot of this had seperated from the sides of the boat and some i had to remove to get to the floor which went uner it. My question is how do I readhere it to the sides of the boat. I thought of using epoxy but will that eat the foam?
      sigpic
      Buy American

      1993 Ford Thunderbird rebuild
      http://www.cardomain.com/ride/3351730

      1990 Larson All American 150
      https://forums.iboats.com/showthread.php?t=358025

      If its worth doing, it's worth doing right

      Comment


      • #4
        Re: transom and floor replacement


        A better picture of where I had to remove the foam

        A Picture of where the foam has seperated.

        The foam thruout the boat is amazingly dry and I dont think I will have to replace any of it as long as i can find a way to glue this stuff back on. after it is glued back on i plan to fiberglass the edges into the boat to waterproof it and make it so it hopefully wont seperate again.
        sigpic
        Buy American

        1993 Ford Thunderbird rebuild
        http://www.cardomain.com/ride/3351730

        1990 Larson All American 150
        https://forums.iboats.com/showthread.php?t=358025

        If its worth doing, it's worth doing right

        Comment


        • #5
          Re: transom and floor replacement

          So I finally got back on the boat. I got 5 gallons of seacast and poured the transom and am now working on the floor. I built the inner transom wall with 2 layers of biax and polyester resin wet out on plywood covered with moldrelease. then sealed that into the hull and bolted thru all existing holes in the transom. the stuff got so hot while curing that you could barely touch the outer skin. now the transom feels rock hard and will never rot again.
          sigpic
          Buy American

          1993 Ford Thunderbird rebuild
          http://www.cardomain.com/ride/3351730

          1990 Larson All American 150
          https://forums.iboats.com/showthread.php?t=358025

          If its worth doing, it's worth doing right

          Comment


          • #6
            Re: transom and floor replacement

            awesome project, Curious as to why you used sea cast vs. plywood sealed with epoxy? always looking for perspectives, i'm in the process of doing my islander at the moment.

            Keep up the good work!

            Tim
            ------------------------------------------

            There is much to be said, in a world like ours, for taking the world as you find it and fishing with a worm.-Bliss Perry, 1904


            Project
            1974 Starcraft Chieftain
            https://forums.iboats.com/showthread...errerid=174999

            "Completed" Project
            1991 Starcraft Islander 191V - Rebuild
            https://forums.iboats.com/showthread.php?t=359551

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            • #7
              Re: transom and floor replacement

              I used seacast because I never want to have to do this again. The previous transom was plywood in fiberglass but every hole in the transom alowed water to get in the wood and rot it. The worst invasion came from around the drain hole. With seacast even if water gets to the seacast it will not do any damage. I am using plywood covered on both sides with fiberglass resin so hopefully it will not rot in the future. If cost were not an option I would use seacast for the floors also.
              sigpic
              Buy American

              1993 Ford Thunderbird rebuild
              http://www.cardomain.com/ride/3351730

              1990 Larson All American 150
              https://forums.iboats.com/showthread.php?t=358025

              If its worth doing, it's worth doing right

              Comment


              • #8
                Re: transom and floor replacement


                I found out the seacast had to be sandwiched between layers of fiberglass. So I had to remove my form and build and install a fiberglass inner wall for the transom. The inner wall was made with 2 layers of biax and 1 and 1/2 quarts of polyester resin.



                I poured the transom then removed the plywood backing from the inner wall.

                After the transom was finished I finished removing the floor
                sigpic
                Buy American

                1993 Ford Thunderbird rebuild
                http://www.cardomain.com/ride/3351730

                1990 Larson All American 150
                https://forums.iboats.com/showthread.php?t=358025

                If its worth doing, it's worth doing right

                Comment


                • #9
                  Re: transom and floor replacement

                  SKIBUM1M,
                  Not much will eat the foam. You can use about anything you want to reattach it. I would recommend that you pour new foam myself. If you decide to reuse the foam make sure you seal it. The closed cell foam won't soke up much water by it will hold some.
                  My boat had the foam on the gunwales to and I'm just going to re-pour the foam. and then paint it.
                  Looks like a good project.
                  Have fun.
                  Bob
                  1988 Glasstream
                  https://forums.iboats.com/showthread.php?t=357690

                  Glasstream restoration
                  http://s969.photobucket.com/albums/ae174/rhedden_2009/

                  Wood Working projects
                  http://s969.photobucket.com/albums/a...ing%20Hobbies/

                  Comment


                  • #10
                    Re: transom and floor replacement

                    Originally posted by SKIBUM1M View Post

                    I found out the seacast had to be sandwiched between layers of fiberglass. So I had to remove my form and build and install a fiberglass inner wall for the transom. The inner wall was made with 2 layers of biax and 1 and 1/2 quarts of polyester resin.

                    Not that it matters now but you coulda left the ply form in place and poured the seacast, then remove the form and glass an inner glass wall right onto the seacast, less work that way.

                    I made an inner wall from 1/2inch ply, I pre-glassed it both sides and sealed the edges, then poured the seacast and left the plywood where it is.
                    Transom is 3 inches thick now. I had to buy $40 longer engine bolts. duh!

                    Try contact cement to attach that foam again.
                    sigpic
                    See FAQ Files.
                    https://forums.iboats.com/showthread.php?t=299680

                    Get the genuine factory service manual.
                    www.outboardbooks.com

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                    • #11
                      Re: transom and floor replacement

                      I ended up using fiberglass resin to reattach the foam. the foam is in great shape and doesnt look like it has ever gotten wet since it has a fiberglass inner wall. I would have left the plywood in place but the splashwell limits the thickness of the transom. I have many more pics and will try to post them tomorrow. Clamping the foam on the sides was very tricky wait till you see my solution in the pics.
                      sigpic
                      Buy American

                      1993 Ford Thunderbird rebuild
                      http://www.cardomain.com/ride/3351730

                      1990 Larson All American 150
                      https://forums.iboats.com/showthread.php?t=358025

                      If its worth doing, it's worth doing right

                      Comment


                      • #12
                        Re: transom and floor replacement


                        I built cross braces out of fir wrapped in fiberglass and then fiberglassed them into the stringers. I then cut mat to line the stringers with to glass the floor down with.

                        Then I glassed and screwed the deck down and then tabbed in the sides


                        Next it was time to clamp the foam back on the sides. I used everything I had including spring clamps, c clamps, and a valve spring compressor. to hold the bottom I used 2 spring loaded shower curtain rods.

                        sigpic
                        Buy American

                        1993 Ford Thunderbird rebuild
                        http://www.cardomain.com/ride/3351730

                        1990 Larson All American 150
                        https://forums.iboats.com/showthread.php?t=358025

                        If its worth doing, it's worth doing right

                        Comment


                        • #13
                          Re: transom and floor replacement


                          sigpic
                          Buy American

                          1993 Ford Thunderbird rebuild
                          http://www.cardomain.com/ride/3351730

                          1990 Larson All American 150
                          https://forums.iboats.com/showthread.php?t=358025

                          If its worth doing, it's worth doing right

                          Comment


                          • #14
                            Re: transom and floor replacement

                            SKIBUM1M,
                            That looks like a lot of work to save some foam.
                            Like I told you before not much with eat it.
                            Looks good
                            Bob
                            1988 Glasstream
                            https://forums.iboats.com/showthread.php?t=357690

                            Glasstream restoration
                            http://s969.photobucket.com/albums/ae174/rhedden_2009/

                            Wood Working projects
                            http://s969.photobucket.com/albums/a...ing%20Hobbies/

                            Comment


                            • #15
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                              Re: transom and floor replacement

                              I understand bob but i dont know how to do foam on a vertical surface and then the cost of the foam and the fiberglass to coat the inside. It just seemed cheaper and easier to me to reuse what was there. I do need to find a way to fill the valley between the new deck and the edges. It was filled with some sort of foam. What can I use that will fill this area that is about 1 inch deep and 2 to 6 inches wide?
                              sigpic
                              Buy American

                              1993 Ford Thunderbird rebuild
                              http://www.cardomain.com/ride/3351730

                              1990 Larson All American 150
                              https://forums.iboats.com/showthread.php?t=358025

                              If its worth doing, it's worth doing right

                              Comment

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