Home |
Search |
Today's Posts |
|
#1
posted to rec.boats.building
|
|||
|
|||
the raging debate of marine plywood / fiberglassing / etc
hi all,
i've been searching through the group .. i keep finding conflicting opinions.. hoping i can ask my exact question and get an answer i just bought a 2003 bayliner 2150 classic (21.5 foot ski boat basically). the previous owner left the boat out in the sun/water/etc for 3 years without a cover!! the carpet is trashed. i ripped it all up tonight. low and behold, the plywood is rotten. question1) how do i remove the rotten plywood.. do i take a saw and just cut the wood out.. or is it screwed in somewhere.. do i need to be careful *where* i cut? what is underneath the plywood.. more wood (that is probably rotten as well)?? question2) i've read that if you fiberglass over plywood, sometimes the fiberglass cracks and lets water seep into the plywood and rots all over again.. ?? myth or truth? question3) so.. what i really want to do is have plywood and then a paint with sand in it to give a grip to the feet when walking.. and be done with it.. what plywood/paint/anything in between the two should i use? many thanks!!! |
#2
posted to rec.boats.building
|
|||
|
|||
the raging debate of marine plywood / fiberglassing / etc
Hi Kyle,
This is more sailboat related, but if you are looking for tips on restoring a boat, please click your way over to www.triton381.com this guy (Tim) restored a very old sailboat into something spectacular and DOCUMENTED every aspect of the refit including plywood, decks etc. I use his site daily (and I am just in the planning stages of my refit)! Good luck Tom Only 2 things make a man crazy - women and boats kyle wrote: hi all, i've been searching through the group .. i keep finding conflicting opinions.. hoping i can ask my exact question and get an answer i just bought a 2003 bayliner 2150 classic (21.5 foot ski boat basically). the previous owner left the boat out in the sun/water/etc for 3 years without a cover!! the carpet is trashed. i ripped it all up tonight. low and behold, the plywood is rotten. question1) how do i remove the rotten plywood.. do i take a saw and just cut the wood out.. or is it screwed in somewhere.. do i need to be careful *where* i cut? what is underneath the plywood.. more wood (that is probably rotten as well)?? question2) i've read that if you fiberglass over plywood, sometimes the fiberglass cracks and lets water seep into the plywood and rots all over again.. ?? myth or truth? question3) so.. what i really want to do is have plywood and then a paint with sand in it to give a grip to the feet when walking.. and be done with it.. what plywood/paint/anything in between the two should i use? many thanks!!! |
#3
posted to rec.boats.building
|
|||
|
|||
the raging debate of marine plywood / fiberglassing / etc
kyle wrote: hi all, i've been searching through the group .. i keep finding conflicting opinions.. hoping i can ask my exact question and get an answer i just bought a 2003 bayliner 2150 classic (21.5 foot ski boat basically). the previous owner left the boat out in the sun/water/etc for 3 years without a cover!! the carpet is trashed. i ripped it all up tonight. low and behold, the plywood is rotten. question1) how do i remove the rotten plywood.. do i take a saw and just cut the wood out.. or is it screwed in somewhere.. do i need to be careful *where* i cut? what is underneath the plywood.. more wood (that is probably rotten as well)?? question2) i've read that if you fiberglass over plywood, sometimes the fiberglass cracks and lets water seep into the plywood and rots all over again.. ?? myth or truth? question3) so.. what i really want to do is have plywood and then a paint with sand in it to give a grip to the feet when walking.. and be done with it.. what plywood/paint/anything in between the two should i use? many thanks!!! You need to remove the rotted plywood. If it's rotted any screws shouldn't be that much of a problem, the screws should pull right through. I suspect underneath you'll find the bilge (obviously) and flotation material that is probably waterlogged as well, it will need to be replaced as well. Fiberglass, properly applied to plywood, should last a long time. Avoid very thin wood as it may flex too much, causing the fiberglass to crack allowing water to get in. Try a local marine shop for paint and the sand additive, but outdoor carpet is usually easier, cheaper and looks better. I have seen people coat the floor with gell coat that has been thickened and applied with a roller to give a rough finish, too rough it'll take the skin off your bare feet, so most sand it down some, but this finish looks pretty good. John |
#4
posted to rec.boats.building
|
|||
|
|||
the raging debate of marine plywood / fiberglassing / etc
thanks so much for responses.
i am going to take a chunk of rotten plywood out tonight and see if the stringers are rotten. if they are, i don't know what to do.. pay $1K for a professional? i am no match for replacing stringers.. i'm a newbie.. if stringers are okay.. then i will get marine plywood, roller two coats of epoxy on both sides and if any wood needs jointing, do butt joints, sand to 80grit, then apply Skid-no-more to the top surface, and be good as new. does this sound like an okay plan? i want to do away with carpet because of the rot factor.. Capt John wrote: kyle wrote: hi all, i've been searching through the group .. i keep finding conflicting opinions.. hoping i can ask my exact question and get an answer i just bought a 2003 bayliner 2150 classic (21.5 foot ski boat basically). the previous owner left the boat out in the sun/water/etc for 3 years without a cover!! the carpet is trashed. i ripped it all up tonight. low and behold, the plywood is rotten. question1) how do i remove the rotten plywood.. do i take a saw and just cut the wood out.. or is it screwed in somewhere.. do i need to be careful *where* i cut? what is underneath the plywood.. more wood (that is probably rotten as well)?? question2) i've read that if you fiberglass over plywood, sometimes the fiberglass cracks and lets water seep into the plywood and rots all over again.. ?? myth or truth? question3) so.. what i really want to do is have plywood and then a paint with sand in it to give a grip to the feet when walking.. and be done with it.. what plywood/paint/anything in between the two should i use? many thanks!!! You need to remove the rotted plywood. If it's rotted any screws shouldn't be that much of a problem, the screws should pull right through. I suspect underneath you'll find the bilge (obviously) and flotation material that is probably waterlogged as well, it will need to be replaced as well. Fiberglass, properly applied to plywood, should last a long time. Avoid very thin wood as it may flex too much, causing the fiberglass to crack allowing water to get in. Try a local marine shop for paint and the sand additive, but outdoor carpet is usually easier, cheaper and looks better. I have seen people coat the floor with gell coat that has been thickened and applied with a roller to give a rough finish, too rough it'll take the skin off your bare feet, so most sand it down some, but this finish looks pretty good. John |
#5
posted to rec.boats.building
|
|||
|
|||
the raging debate of marine plywood / fiberglassing / etc
kyle wrote:
snip question1) how do i remove the rotten plywood.. do i take a saw and just cut the wood out.. or is it screwed in somewhere.. do i need to be careful *where* i cut? what is underneath the plywood.. more wood (that is probably rotten as well)?? Remove the plywood in as large a piece(s) as possible, then later use them as a pattern for replacement. question2) i've read that if you fiberglass over plywood, sometimes the fiberglass cracks and lets water seep into the plywood and rots all over again.. ?? myth or truth? It depends. Epoxy provides a water tight bond to wood, polyester resin does not. Use epoxy for repair work. question3) so.. what i really want to do is have plywood and then a paint with sand in it to give a grip to the feet when walking.. and be done with it.. what plywood/paint/anything in between the two should i use? You can use any kind of plywood available if you cover it with epoxy and glass. If it were me, I'd use a piece of cheap, 1/2", 4 ply, CDX plywood with a layer of DB170 (17 OZ, double bias, knitted glass) on each side, then seal the edges with a layer of 4" "boat tape" (about 6 OZ glass). It will be bullet proof. Lew |
#6
posted to rec.boats.building
|
|||
|
|||
the raging debate of marine plywood / fiberglassing / etc
Lew,
Thanks for the response. Two questions. 1) 4" "boat tape" (about 6 OZ glass) -- is this 6 OZ fiberglass, or is it something else called "boat tape" (or they are one in the same)?? 2) If I fiberglass, then lay marine carpet.. what do you think the life expectancy of the deck will be with continuous water splashing on the deck soaking into the carpet?? or should i just do the evercoat skid-no-more solution.. this is my first boat and i am worried it might hurt the kids feet? but i don't want to do this whole project over 3 yrs from now either... Lew Hodgett wrote: kyle wrote: snip question1) how do i remove the rotten plywood.. do i take a saw and just cut the wood out.. or is it screwed in somewhere.. do i need to be careful *where* i cut? what is underneath the plywood.. more wood (that is probably rotten as well)?? Remove the plywood in as large a piece(s) as possible, then later use them as a pattern for replacement. question2) i've read that if you fiberglass over plywood, sometimes the fiberglass cracks and lets water seep into the plywood and rots all over again.. ?? myth or truth? It depends. Epoxy provides a water tight bond to wood, polyester resin does not. Use epoxy for repair work. question3) so.. what i really want to do is have plywood and then a paint with sand in it to give a grip to the feet when walking.. and be done with it.. what plywood/paint/anything in between the two should i use? You can use any kind of plywood available if you cover it with epoxy and glass. If it were me, I'd use a piece of cheap, 1/2", 4 ply, CDX plywood with a layer of DB170 (17 OZ, double bias, knitted glass) on each side, then seal the edges with a layer of 4" "boat tape" (about 6 OZ glass). It will be bullet proof. Lew |
#7
posted to rec.boats.building
|
|||
|
|||
the raging debate of marine plywood / fiberglassing / etc
kyle wrote:
1) 4" "boat tape" (about 6 OZ glass) -- is this 6 OZ fiberglass, or is it something else called "boat tape" (or they are one in the same)?? They are one and the same. "Boat Tape" is a generic description of a light weight glass tape sold in 50' rolls. 2) If I fiberglass, then lay marine carpet.. what do you think the life expectancy of the deck will be with continuous water splashing on the deck soaking into the carpet?? or should i just do the evercoat skid-no-more solution.. this is my first boat and i am worried it might hurt the kids feet? but i don't want to do this whole project over 3 yrs from now either... Save your money and forget the carpet. The glass itself will provide a rough enough surface, just paint it to provide UV resistance for the epoxy. BTW, you want to bond the new deck to the stringers with SikaFlex 291. Have fun. Lew |
#8
posted to rec.boats.building
|
|||
|
|||
the raging debate of marine plywood / fiberglassing / etc
OK. Awesome answers. One more question then I'm done for the day
When I cut the piece of rotten plywood out from th eboat, then cut a fresh piece in the exact size.. what do I do first? 1) I fiberglass/epoxy it the 4 coats (seal, bond, fill, finish -- are all of these needed for what i'm doing??) -- both sides & edges 2) do I need to create any butt-joints to mesh with other sides of plywood still mounted to stringers? 3) apply a thick coat of sikaflex to the stringer, then lay the glassed piece down / joint it ? Lew Hodgett wrote: kyle wrote: 1) 4" "boat tape" (about 6 OZ glass) -- is this 6 OZ fiberglass, or is it something else called "boat tape" (or they are one in the same)?? They are one and the same. "Boat Tape" is a generic description of a light weight glass tape sold in 50' rolls. 2) If I fiberglass, then lay marine carpet.. what do you think the life expectancy of the deck will be with continuous water splashing on the deck soaking into the carpet?? or should i just do the evercoat skid-no-more solution.. this is my first boat and i am worried it might hurt the kids feet? but i don't want to do this whole project over 3 yrs from now either... Save your money and forget the carpet. The glass itself will provide a rough enough surface, just paint it to provide UV resistance for the epoxy. BTW, you want to bond the new deck to the stringers with SikaFlex 291. Have fun. Lew |
#9
posted to rec.boats.building
|
|||
|
|||
the raging debate of marine plywood / fiberglassing / etc
kyle wrote: hi all, i've been searching through the group .. i keep finding conflicting opinions.. hoping i can ask my exact question and get an answer Stitch and glue driftboats are a special case, that make a good general point, I think. A driftboat (a dory that drifts down a river) gets its bottom pounded like no other boat. No matter how much glass you put over the bottom and chine, cuts in the glass skin will inevitably expose the plywood. Then the plywood wicks up moisture, which gets trapped almost forever, between the glass skins. Some guys (montana boat builders dot com) have essentially solved that problem (for stitch and glue boats anyway) by puting hot spray truck bed liner on the outside. Another way to deal with it is to use plastic honeycomb core for the bottom panel, instead of plywood. If you do that, you need a little extra glass, to stiffen the panel sufficiently. But when and if the skin gets cut, the moisture does not wick sideways into the honeycomb. For me it's all about do-it-yourself boatbuilding, not necessarily with wood. Plywood makes good side panels on dories.......a place that doesn't get pounded. For bottom panels on driftboats, I don't like plywood. Plascore (or nida core) might be a better core for any homemade boat. |
#10
posted to rec.boats.building
|
|||
|
|||
the raging debate of marine plywood / fiberglassing / etc
On 15 Oct 2006 08:23:29 -0700, "Leaks"
wrote: kyle wrote: hi all, i've been searching through the group .. i keep finding conflicting opinions.. hoping i can ask my exact question and get an answer Stitch and glue driftboats are a special case, that make a good general point, I think. A driftboat (a dory that drifts down a river) gets its bottom pounded like no other boat. No matter how much glass you put over the bottom and chine, cuts in the glass skin will inevitably expose the plywood. Then the plywood wicks up moisture, which gets trapped almost forever, between the glass skins. Some guys (montana boat builders dot com) have essentially solved that problem (for stitch and glue boats anyway) by puting hot spray truck bed liner on the outside. Another way to deal with it is to use plastic honeycomb core for the bottom panel, instead of plywood. If you do that, you need a little extra glass, to stiffen the panel sufficiently. But when and if the skin gets cut, the moisture does not wick sideways into the honeycomb. .... Which reminds me - a Lake patrol man showed me the bottom of his airboat one day. To allow it to dock right up the ramp onto the hard, they fitted the bottom with a low friction plate - either high density polyethylene - or it might even have been teflon. Brian Whatcott Altus OK |
Reply |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Just a few names... | General | |||
Marine Plywood Suppliers in Atlanta | Boat Building | |||
Essentials of a Marine Boat Alarm System | Electronics | |||
watertight coating for marine plywood deck | Boat Building | |||
Plywood & Fiberglass deck | Boat Building |