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Old 12-05-2019, 03:26 PM   #1
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Clear porthole covers for Winter liveaboard ?

We are year round liveaboards in Ct.
We have the PYH1 portholes and have been experimenting with clear covers over the ports on the outside. We leave a few ports clear for available day light and cover the rest with opaque refletix inserts.
The clear sample sheets have cut down on the drafts and convection heat loss. Does anybody know of a company that makes something like this ?
Of course, we would need to install some snaps or a track on the outside of the boat above the windows. We would remove the panels in the spring.
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Old 12-05-2019, 03:58 PM   #2
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We replaced the 11 portholes in our 41 with NFM ports. As to covering the ports on the outside maybe a clear shrink wrap? I think that 3M makes kits that go on the inside of house windows, maybe there is someone that makes something similar for the outside.
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Old 12-05-2019, 05:44 PM   #3
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We are year round liveaboards in Ct.
We have the PYH1 portholes and have been experimenting with clear covers over the ports on the outside. We leave a few ports clear for available day light and cover the rest with opaque refletix inserts.
The clear sample sheets have cut down on the drafts and convection heat loss. Does anybody know of a company that makes something like this ?
Of course, we would need to install some snaps or a track on the outside of the boat above the windows. We would remove the panels in the spring.
Is it like the Outland hatch covers?
Welcome to Outland Boat Hatch Covers | Outland Hatch Covers
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Old 12-05-2019, 07:24 PM   #4
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Over in EU and UK the narrowboat and barge guys make bungs as they're called. They are insulated pillow like things that fit neatly but snuggle in windows, portholes, and portlites. I don't know how you could make them clear. You could use acrylic glass and wrap some foam around the edges like auto door seals and that should seal them into the window openings. They wouldn't really be insulated but would add a layer between the inside and out plus block or slow down drafts.







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Old 12-05-2019, 07:59 PM   #5
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I often wonder if it would be worth the extra cost to install double pane glass windows and portholes. Perhaps on a new build or major refit.
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Old 12-05-2019, 08:38 PM   #6
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Your local hardware store should have weather insulation kits. It’s a clear film that goes over the port creating an insulation air gap between the weather and the port.
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Old 12-05-2019, 08:57 PM   #7
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double pane windows and hatches

With all the flexing that happens on with a boat, the seal between the two panes probably would not last long. I know that some narrowboat builders offer that as an option, but they have a big rubber gasket between the opening and the window, so any boat flex is isolated from the windows.

Double pane windows have two parallel panes of glass (and sometimes a film suspended in the middle, between the glass panes) and then a glue bonded to hold the windows together as one part. Then all the air is replaced with an inert gas like argon or nitrogen.

It would be nice to have a vacuum between the two panes but the seal wouldn't hold the vacuum too long.

The average double pane window has a life of about 15 years before you need to replace at least some of them.
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Old 12-05-2019, 09:17 PM   #8
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If you are just looking to let light in and donít need to see out of them, bubblewrap works well and you can probably get it for free. Just cut it to size and stick it to the glass.
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Old 12-06-2019, 06:06 AM   #9
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Big box stores sell clear shrink plastic for dirt houses with double stick tape.

Do both inside and outside , and if vision out doesn't matter bubble wrap between the layers helps.
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Old 12-06-2019, 10:18 AM   #10
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With all the flexing that happens on with a boat, the seal between the two panes probably would not last long. I know that some narrowboat builders offer that as an option, but they have a big rubber gasket between the opening and the window, so any boat flex is isolated from the windows.

Double pane windows have two parallel panes of glass (and sometimes a film suspended in the middle, between the glass panes) and then a glue bonded to hold the windows together as one part. Then all the air is replaced with an inert gas like argon or nitrogen.

It would be nice to have a vacuum between the two panes but the seal wouldn't hold the vacuum too long.

The average double pane window has a life of about 15 years before you need to replace at least some of them.
That must be the older ones. The newer narrow boats glue the windows in flush with the hull using urethane. A couple guys I chat with had a narrow boat built a little over a year ago and that's the way they installed theirs. No leaks, yet.
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Old 12-06-2019, 01:20 PM   #11
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This is a $0.27 thin clear ~14" flower pot water base with about a dollar's worth of split pipe insulation around the edge, both from Lowe's - pressed up around the outside of the port.

Works pretty good for us!
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Old 12-06-2019, 01:59 PM   #12
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This is a $0.27 clear ~14" flower pot water base with about a dollar's worth of split pipe insulation around the edge - pressed up around the outside of the port.

Works pretty good for us!
That is a pretty cool and cheap idea.
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Old 12-06-2019, 02:52 PM   #13
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I'm a full time liveaboard in Boston. I don't wrap any of my portholes.
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Old 12-06-2019, 04:13 PM   #14
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I'm a full time liveaboard in Boston. I don't wrap any of my portholes.
Your window shapes would be hard to wrap, I would think..... JFK library would still be in your sights..
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Old 12-06-2019, 04:22 PM   #15
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Your window shapes would be hard to wrap, I would think..... JFK library would still be in your sights..

Haha, yeah! I love my city views!
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Old 12-06-2019, 04:32 PM   #16
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Haha, yeah! I love my city views!
JFK out one side, Ho chi Minh out the other?, right?
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Old 12-06-2019, 06:02 PM   #17
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JFK out one side, Ho chi Minh out the other?, right?


??
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Old 12-06-2019, 06:10 PM   #18
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JFK out one side, Ho chi Minh out the other?, right?
I donít get it either...
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Old 12-06-2019, 06:11 PM   #19
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This is a $0.27 thin clear ~14" flower pot water base with about a dollar's worth of split pipe insulation around the edge, both from Lowe's - pressed up around the outside of the port.

Works pretty good for us!
His portholes are rectangular in shape so these wonít work on his.
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Old 12-20-2019, 02:28 PM   #20
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We spent 5 winters in the Chesapeake. We have seen temps to -2 degrees. for our climate the clear window film has proven to be good at stopping drafts and providing some added thermal insulation. On some of our larger windows in the salon we put 4 mill polyethylene foam between the glass and the clear film covering about 60% of the window. IT lets light in and still gives a view out the window .
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