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  • Looking for a little help

    Looking for some knowledge here. I am wanting to replace the stringers in my boat. I am thinking about building a grid, fiberglass into place and then fill with foam. My question is, what pound density foam would be best to act as a structural core? In most cases, the structural aspect is simply the grid itself. But I want to foam fill the grid. Would 2lb suffice or would an 8lb be better? If I choose to build stringers separately in a mould out of foam and then glass over, would the 2lb still work or would the 8lb be required? Thanks for any info in advance.
    BadMako.[br]

  • #2
    The integrity of the stringer is the glass. That's why some are still good even though the wood is gone. I used 4 lb foam when I did some sections of my little Mako. why are you set on foam verse wood or composite?
    [br]1984 Mako 224[br]1977 Mako 15[br]Clermont, Florida- [br]http://www.classicmako.com/forum/topic.asp?TOPIC_ID=37212 -Rewire[br]http://www.classicmako.com/forum/topic.asp?TOPIC_ID=40627 -Tank/Misc[br]http://www.classicmako.com/forum/topic.asp?TOPIC_ID=58615 - Aft Box removal

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    • #3
      You can buy the same closed cell pour foam in sheets in the 2#, 4# or 8#. Build your grid with that and glass over. Save yourself the pouring mess and a few steps.

      Like said above, the core material is just a mold to shape the glass. it wasn't intended to be structural (even thought it inherently will add integrity)
      [br]Michael R. Delgado[br]1972 Mako 22[br]http://classicmako.com/forum/topic.asp?TOPIC_ID=15745[br]1976 Mako 25[br]http://classicmako.com/forum/topic.asp?TOPIC_ID=18013&SearchTerms=mako,25[br]

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      • #4
        quote:


        Originally posted by snappergapper


        The integrity of the stringer is the glass. That's why some are still good even though the wood is gone. I used 4 lb foam when I did some sections of my little Mako. why are you set on foam verse wood or composite?



        Wanted to stay away from wood this go around simply for weight. I know the grid would be what makes the strength but wanted to beef it up so to speak with foam, but wasnt sure if it needed to be a specific lb to make it worth it.
        BadMako.[br]

        Comment


        • #5
          quote:


          Originally posted by mrdelgado


          You can buy the same closed cell pour foam in sheets in the 2#, 4# or 8#. Build your grid with that and glass over. Save yourself the pouring mess and a few steps.


          Like said above, the core material is just a mold to shape the glass. it wasn't intended to be structural (even thought it inherently will add integrity)


          Depends on the cost. If I can find it for the right price. Hard to find in the Houston area. I did find some but at 450 a sheet it gets pricey quick. You know of any good places I can look for? Thank you.
          BadMako.[br]

          Comment


          • #6
            quote:


            Originally posted by BarryJohnsonjr


            quote:


            Originally posted by mrdelgado


            You can buy the same closed cell pour foam in sheets in the 2#, 4# or 8#. Build your grid with that and glass over. Save yourself the pouring mess and a few steps.


            Like said above, the core material is just a mold to shape the glass. it wasn't intended to be structural (even thought it inherently will add integrity)


            Depends on the cost. If I can find it for the right price. Hard to find in the Houston area. I did find some but at 450 a sheet it gets pricey quick. You know of any good places I can look for? Thank you.



            I hear ya, pour foam kits arent cheap either. Google Polyisocyanurate Foam Sheets. Its what I was referring to.
            [br]Michael R. Delgado[br]1972 Mako 22[br]http://classicmako.com/forum/topic.asp?TOPIC_ID=15745[br]1976 Mako 25[br]http://classicmako.com/forum/topic.asp?TOPIC_ID=18013&SearchTerms=mako,25[br]

            Comment


            • #7
              quote:


              Originally posted by mrdelgado


              quote:


              Originally posted by BarryJohnsonjr


              quote:


              Originally posted by mrdelgado


              You can buy the same closed cell pour foam in sheets in the 2#, 4# or 8#. Build your grid with that and glass over. Save yourself the pouring mess and a few steps.


              Like said above, the core material is just a mold to shape the glass. it wasn't intended to be structural (even thought it inherently will add integrity)


              Depends on the cost. If I can find it for the right price. Hard to find in the Houston area. I did find some but at 450 a sheet it gets pricey quick. You know of any good places I can look for? Thank you.



              Thank you. I checked them out. Weird they dont sell full sheet like 4x8. Makes me wonder if I could just make my own. I may give it a try. Thanks again.

              I hear ya, pour foam kits arent cheap either. Google Polyisocyanurate Foam Sheets. Its what I was referring to.


              BadMako.[br]

              Comment

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