double glazing?

[born2sail61]

as part of the reburb on my new project(kingfisher 20) I need to replace the windows due to crazing.the rubber seals leak(they are 50+ years old!) and so i intend bedding the new polycarb on sealant and nut and bolting through cabin sides.would there be anything to gain by repeating this on the inside?there would be an air gap of around 5mm.i'm thinking (probably wrongly) that it may add insulation and an extra layer of waterproofing.your thoughts please but be gentle with me!

 

[prv]

Probably not worth the effort, but I guess it would avoid condensation on the cold window (but you'll probably still get it all over the deckhead anyway...). Might steam up between the two layers though - proper double glazing has all moisture removed from the space and then sealed.

Pete

 

[born2sail61]

hadn't considered the steaming up issue,thanks

 

[Pleiades]

I lived onboard last winter and found that condensation dripping from the forehatch and the dog house windows was completely eliminated by diy double glazing. Simply cut some acrylic sheeting to the right shape then taped the pieces to the inside of the hatch/window frames with clear tape. Looked ok and the tape lasted a few months at a time before needed replacing. Well worth doing if you want something non permanent -cost a few quid, removed for the summer when not needed.
Robin
Pleiades of Birdham
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