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#1
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Plywood question
I have a houseboat and I want to redo the surface of the upper deck with a
vinyl membrane like product. It requires a fresh clean wood surface to glue it to. My question - can I nail/screw down plywood on top of the existing surface which is fiberglass over plywood? With the glass underneath and the vinyl over it, will the plywood survive this or will it rot out quickly? Thanks. |
#2
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On Thu, 14 Jul 2005 20:42:31 -0400, "Steve Lortie"
wrote: I have a houseboat and I want to redo the surface of the upper deck with a vinyl membrane like product. It requires a fresh clean wood surface to glue it to. My question - can I nail/screw down plywood on top of the existing surface which is fiberglass over plywood? With the glass underneath and the vinyl over it, will the plywood survive this or will it rot out quickly? Thanks. I would coat the plywood with Epoxy resin if I didn't want it to rot out, especially the edges. Also make sure to use either marine or ext plywood to prevent delamination. But why not rough the fiberglass surface and glue direct to the existing deck instead? You may have to use a different adhesive product, but it seems a better option Weebles Wobble (but they don't fall down) |
#3
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One answer I keep hearing to questions on how to do things is to follow the
manufacturer's instructions.This manufacturer is specific about how to install it of course. Sanding the fibergass would probably be easier than laying new plywood for sure. link to product site - http://www.ducan.com/products/dek_master.html My concern is whether the plywood will rot being sandwiched between two waterproof but airtight layers. My concern wrote in message ... On Thu, 14 Jul 2005 20:42:31 -0400, "Steve Lortie" wrote: I have a houseboat and I want to redo the surface of the upper deck with a vinyl membrane like product. It requires a fresh clean wood surface to glue it to. My question - can I nail/screw down plywood on top of the existing surface which is fiberglass over plywood? With the glass underneath and the vinyl over it, will the plywood survive this or will it rot out quickly? Thanks. I would coat the plywood with Epoxy resin if I didn't want it to rot out, especially the edges. Also make sure to use either marine or ext plywood to prevent delamination. But why not rough the fiberglass surface and glue direct to the existing deck instead? You may have to use a different adhesive product, but it seems a better option Weebles Wobble (but they don't fall down) |
#4
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On Thu, 14 Jul 2005 22:33:51 -0400, "Steve Lortie"
wrote: One answer I keep hearing to questions on how to do things is to follow the manufacturer's instructions.This manufacturer is specific about how to install it of course. Sanding the fibergass would probably be easier than laying new plywood for sure. link to product site - http://www.ducan.com/products/dek_master.html My concern is whether the plywood will rot being sandwiched between two waterproof but airtight layers. My concern wrote in message .. . On Thu, 14 Jul 2005 20:42:31 -0400, "Steve Lortie" wrote: I have a houseboat and I want to redo the surface of the upper deck with a vinyl membrane like product. It requires a fresh clean wood surface to glue it to. My question - can I nail/screw down plywood on top of the existing surface which is fiberglass over plywood? With the glass underneath and the vinyl over it, will the plywood survive this or will it rot out quickly? Thanks. I would coat the plywood with Epoxy resin if I didn't want it to rot out, especially the edges. Also make sure to use either marine or ext plywood to prevent delamination. But why not rough the fiberglass surface and glue direct to the existing deck instead? You may have to use a different adhesive product, but it seems a better option Weebles Wobble (but they don't fall down) In reading the site, under the FAQs, they address application over fiberglass: http://www.ducan.com/products/dek_master_FAQ.html#02 Can I install the Dek-Master system over fibreglass? Yes, sand the fibreglass with 50 grit sandpaper, this will rough up the fibreglass to allow for better adhesion. Fibreglass is a very rigid material and the wood sub-structure is constantly moving because of temperature, and moisture content in the air, cracks in the fibreglass may develop. These cracks must be v-grooved out using a razor knife or something similar, caulk this gap by using ducan Rubber fill-It or Ducan Duca-Flex caulking compounds. Sometimes the fibreglass may have lifted away from the plywood sub-surface causing a large bubble in the finished surface. The bubble should be cut out and new fibreglass applied in this area and then the Dek-Master vinyl can be installed. NOTE: Ducan does not warranty the sub-surface to which the vinyl has been applied, if the substrate is the cause of the failure, your warranty will be null & void. Ducan always recommends a new plywood sub-surface prior to installing the vinyl. I think this is a much better idea than laying down a layer of plywood. Weebles Wobble (but they don't fall down) |
#5
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This brings up a good "whatever happened to.." question.
When I lived in the Northwest in the 70's, the answer to every deck problem like this was the same. Something called "Airbal?", "Aerobol?" and burlap. It was an Elmer's glue like product normally used to impregnate the cloth lagging on steam pipes. Many new wooden boats also had these decks which looked very much like a traditional canvas deck. The compound remained slightly rubbery and made an almost perfect non-skid finish. It was said you could make any boat watertight as long as the wood was not so rotten you broke through it. I haven't heard a reference to this stuff in a couple of decades but they are still lagging steam pipes so it probably could be recreated. Does anybody remember this stuff? -- Roger Long |
#6
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On Fri, 15 Jul 2005 11:03:44 GMT, "Roger Long"
wrote: This brings up a good "whatever happened to.." question. When I lived in the Northwest in the 70's, the answer to every deck problem like this was the same. Something called "Airbal?", "Aerobol?" and burlap. It was an Elmer's glue like product normally used to impregnate the cloth lagging on steam pipes. Many new wooden boats also had these decks which looked very much like a traditional canvas deck. The compound remained slightly rubbery and made an almost perfect non-skid finish. It was said you could make any boat watertight as long as the wood was not so rotten you broke through it. I haven't heard a reference to this stuff in a couple of decades but they are still lagging steam pipes so it probably could be recreated. Does anybody remember this stuff? I've seen it mentioned in a few of the older books on boatbuilding but have never used it. Not sure if the product is still around or not, but a quick google search would probably answer that question Weebles Wobble (but they don't fall down) |
#7
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Well, duh.
I remember reading that now but something I read earlier stuck in my mind. Thanks for the refresh. wrote in message ... On Thu, 14 Jul 2005 22:33:51 -0400, "Steve Lortie" wrote: One answer I keep hearing to questions on how to do things is to follow the manufacturer's instructions.This manufacturer is specific about how to install it of course. Sanding the fibergass would probably be easier than laying new plywood for sure. link to product site - http://www.ducan.com/products/dek_master.html My concern is whether the plywood will rot being sandwiched between two waterproof but airtight layers. My concern wrote in message .. . On Thu, 14 Jul 2005 20:42:31 -0400, "Steve Lortie" wrote: I have a houseboat and I want to redo the surface of the upper deck with a vinyl membrane like product. It requires a fresh clean wood surface to glue it to. My question - can I nail/screw down plywood on top of the existing surface which is fiberglass over plywood? With the glass underneath and the vinyl over it, will the plywood survive this or will it rot out quickly? Thanks. I would coat the plywood with Epoxy resin if I didn't want it to rot out, especially the edges. Also make sure to use either marine or ext plywood to prevent delamination. But why not rough the fiberglass surface and glue direct to the existing deck instead? You may have to use a different adhesive product, but it seems a better option Weebles Wobble (but they don't fall down) In reading the site, under the FAQs, they address application over fiberglass: http://www.ducan.com/products/dek_master_FAQ.html#02 Can I install the Dek-Master system over fibreglass? Yes, sand the fibreglass with 50 grit sandpaper, this will rough up the fibreglass to allow for better adhesion. Fibreglass is a very rigid material and the wood sub-structure is constantly moving because of temperature, and moisture content in the air, cracks in the fibreglass may develop. These cracks must be v-grooved out using a razor knife or something similar, caulk this gap by using ducan Rubber fill-It or Ducan Duca-Flex caulking compounds. Sometimes the fibreglass may have lifted away from the plywood sub-surface causing a large bubble in the finished surface. The bubble should be cut out and new fibreglass applied in this area and then the Dek-Master vinyl can be installed. NOTE: Ducan does not warranty the sub-surface to which the vinyl has been applied, if the substrate is the cause of the failure, your warranty will be null & void. Ducan always recommends a new plywood sub-surface prior to installing the vinyl. I think this is a much better idea than laying down a layer of plywood. Weebles Wobble (but they don't fall down) |
#8
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Roger Long wrote:
I haven't heard a reference to this stuff in a couple of decades but they are still lagging steam pipes so it probably could be recreated. Does anybody remember this stuff? You bet, and I'd like to know what happened to it, too. It even *smelled like* Elmer's glue. I miss good ol' asbestos fluff & mud, too, very useful sh&t, screw the idiots who breathed it & sued Johns-Manville. Frank Lagged thousands of feet of piping at sea aboard rustbuckets for greedy MEBA-scale overtime pay, nicest OT job in the engineroom, including fitting & sewing the stuff first. (What ELSE do you as a licensee making runs to the Far East in a 120F engineroom besides fix, weld & rebuild all the **** you can for the biggest payoffbg?) |
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