Forum Title: Old window with two independent panes of glass
Hi, I live in Sweden on a house boat which has an old window from around 1890. It's made up of many small sections (not sure of the technical term for this), each containing two panes of 2mm glass with a 25mm void between them. The window is fixed (not made to be opened). I'm currently refurbishing it as the putty and paint is very old. The external panes are sealed with putty, but the internal panes are simply held in place with pins, though a few of them have been bodged and have draught excluder strips behind them! I'm wondering if I should also seal the internal panes in place, to improve the window's insulating properties. I was thinking to use glazing silicone behind the glass to seal it, and put wooden beading over the glass to hide the silicone. My worry with doing this is that I'll seal in the air between the glass, which will then steam up and perhaps get mouldy! Is it better to seal both panes of glass or leave the internal panes unsealed to allow fresh air in between the panes? I'm not interested in installing double glazed panes, injecting gas to create a vacuum etc, as it's not financially viable for this project. Thanks in advance, Rob
Category: Windows & Doors Post By: EDWARD THOMPSON (Taylorsville, UT), 01/09/2019

Its sort of like getting what you pay for. I've put in a few windows and dont recall spending more than $250 but that was probably 10 years ago. Need to watch that brand name, they have several grades of windows!

- JACQUELINE LONG (Franklin, TN), 02/13/2019

Sealing both panes will commonly lead to fogging between the glass during cold weather. I would not recommend you seal the internal panes, bit instead leave them as is and allow them to breathe.

- DEAN SANTOS (Roswell, NM), 02/26/2019

@xsleeper thanks for the reply. Do you think it would be ok to just fit wooden beading around the glass, and not use any sealant behind the glue? It doesn't look very smart as it is now, with just tacks holding the glass in place. As the window's so old, nothing is completely straight or flat, so a little air should still be able to flow behind the glass. Do you think this is a bad idea? I'm not sure how much space is needed to allow for enough free air flow to prevent fogging. I guess it depends on the external elements too.

- HOWARD GRAY (Grand Prairie, TX), 02/23/2019

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