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Old 09-18-2020, 11:15 AM   #1
TJM
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Clear thermal window coverings

We are year round liveaboards in CT. In the past years we have used the clear indoor shrink that you tape to the window frames and shrink with a heat gun. The problem is condensation gathers and saturates the wood windows. frames etc.... Our window frames are Aluminum and they get cold transferring the cold inside which yields condensation.
This year we want to place some clear thermal barrier "draft stoppers" on the outside of the windows. The outer frames are better sealed than the internal frames. The pieces eliminate the drafts from the sliding windows while adding an air cushion for insulation.

Has anybody else done this ? How did you secure the clear acrylic panels to the window frames or fiberglass ? We do not want velcro and a last resort would be a wooden frame. We were favoring snaps but ?
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Old 09-20-2020, 08:08 AM   #2
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I would figure out how to fit nice exterior summer sun covers that snap in place.

Then have a set made with clear plastic winter windows sewn in.

Any overhang of the covers beyond the glass area might be padded out to make the outer covers fairly air tight. Wont match dual pane windows , but should be warmer.

You can of course still use the stick on plastic on the inside at the same time.
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Old 09-20-2020, 09:28 AM   #3
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Try 3M window weather proofing on the Exterior of the window. We used this transparent film one winter cruise. ?I was also surprised it lasted for several years.
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Old 09-20-2020, 11:10 AM   #4
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I have snaps around all the windows for summer sun covers.

For winter, I cut clear vinyl to the same shape as the sun covers and installed snaps directly on the vinyl.

I put these up when we lived on the boat in winter to reduce condensation. They work very well at keeping the windows clear. They also reduce the cold drafts and keep the interior warmer.

They lasted 17 years before they got scratched up and snaps started pulling out.
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Old 09-24-2020, 07:01 AM   #5
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Thanks for all the tips. Struggling with cooling and heating issues, and appreciate the ideas!
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Old 09-24-2020, 11:29 AM   #6
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We don't have the cold that you speak of, but to beat the heat, we add some extra interior insulation to the windows. Sailrite sells some clear adhesive snap studs that work perfect for mounting the insulation to the windows inside the window frame.
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Old 09-24-2020, 12:42 PM   #7
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I have snaps around all the windows for summer sun covers.

For winter, I cut clear vinyl to the same shape as the sun covers and installed snaps directly on the vinyl.
That's a clever idea that I had not thought of.
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Old 09-24-2020, 01:10 PM   #8
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I would figure out how to fit nice exterior summer sun covers that snap in place.

Then have a set made with clear plastic winter windows sewn in.

Any overhang of the covers beyond the glass area might be padded out to make the outer covers fairly air tight. Wont match dual pane windows , but should be warmer.

You can of course still use the stick on plastic on the inside at the same time.
That's a great idea. I had snap on heavy screens on my old boat, and a winter set as you describe would have been perfect.

To the OP: are you sure you need a second covering? My first liveaboard winter in Toronto last year I didn't make any initial efforts to seal up windows in part because I thought a bit of air exchange wouldn't be a bad thing and I could go at it if it was uncomfortably drafty. It never was, and I didn't have any condensation issues. Once under shrink wrap I didn't notice any drafts through the windows.

I'm settling in for another winter on a new-to-me boat and starting from scratch on winterizing. Probably my biggest concern is sealing things up too tight. But maybe that's just my taste. I've lived most of my winter life in old leaky houses.
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Old 09-24-2020, 04:46 PM   #9
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We lived on the boat during an extra cold winter and the clear plastic sealed around the exterior well. The clear plastic I used was a heavier grade of vinyl window material that layed flat against the boat exterior. No condensation at all between the glass and the clear plastic.

A second sheet of plastic on the interior was not necessary.

I put the clear plastic on every fall and take them off in the spring. An added benefit of the clear window covers is no rain water in the tracks of opening windows. The water in the window tracks would turn into a green moss here in the PNW quickly.

Having a dehumidifier running in the boat, in addition to the window covers, will also reduce condensation, especially during cooking and showering.

To stop condensation from forming on the inside of the overhead hatch in the stateroom and dripping on the bed, I replace the bug screen with plastic in the cold season. I make the plastic cover out of plexiglass that is the same thickness as the bug screen frame. The frame of the bug screen is used as as a pattern to shape the plexiglass with a router. Foam weatherstripping around the perimeter of the plastic to reduce leaks.
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Old 09-24-2020, 08:02 PM   #10
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We're new. You liveaboard year round in CT? Don't you get snow and ice?
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Old 09-25-2020, 05:21 AM   #11
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"We're new. You liveaboard year round in CT? Don't you get snow and ice?"

I lived aboard for decades in the NYC area.

Plenty of snow and ice , but snow is a delight as it adds insulation and cuts dock noise.

The hassle is when the slip freezes over , and the dock is using the dock water system to blow air . The bubbles make it sound like you are living in an aquarium .

The easy solution is to turn off the supply at your finger , but turn it back on as you leave the boat. Most time ashore is long enough to thin or remove the ice from lifting a pile, so no harm is done.

It is expensive to set up a boat for winter aboard the OAT can go into minus numbers F and stay for a week and in a severe storm electric can be off at a marina for a week.

Its only time and currency , and the lifestyle is worth it.
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Old 09-25-2020, 05:35 AM   #12
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Quote:
Originally Posted by syjos View Post
I have snaps around all the windows for summer sun covers.

For winter, I cut clear vinyl to the same shape as the sun covers and installed snaps directly on the vinyl.

I put these up when we lived on the boat in winter to reduce condensation. They work very well at keeping the windows clear. They also reduce the cold drafts and keep the interior warmer.

They lasted 17 years before they got scratched up and snaps started pulling out.
This is a good idea. You can get the clear vinyl at Sailrite. While you're at it, get a snap installation tool. At $150, It's a pricy gizmo, but there isn't really a good alternative and I've used mine frequently to repair broken snaps.

https://www.sailrite.com/Pres-N-Snap...SABEgKJrvD_BwE

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Old 09-25-2020, 10:32 AM   #13
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This is a good idea. You can get the clear vinyl at Sailrite. While you're at it, get a snap installation tool. At $150, It's a pricy gizmo, but there isn't really a good alternative and I've used mine frequently to repair broken snaps.

https://www.sailrite.com/Pres-N-Snap...SABEgKJrvD_BwE

Peter
The Press and Snap is what I use. It's handy to have on board to replace snaps.
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