Utility of trim rings around opening portlights - SailNet Community
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post #1 of 5 Old 10-25-2017 Thread Starter
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Utility of trim rings around opening portlights

My boat has these large opening portlights that are screwed into the cabin wood from the inside with 20+ wood screws. A trim ring goes on the outside of the boat with 10 screws that screw into the wood through the cabin fiberglass outer skin. There is no through-bolting, everything is affixed with wood screws. My question is whether these trim rings serve any purpose? Are they just for aesthetics or do they somehow protect the protruding part of the portlight that sticks out from the cabin sides? I would rather not have 10 more holes potentially leaking into the cabin wood unless there is a reason for it. Thanks.
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post #2 of 5 Old 10-25-2017
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Re: Utility of trim rings around opening portlights

I think they are primarily for aesthetics.. one would have had to cut very precise holes for them for it not to be unsightly from the outside - but they also offer a way to cover and 'trap' sealant so that there's no leakage. Perhaps the trim rings could be bonded in place rather than screwed if you're worried about the extra holes?

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Re: Utility of trim rings around opening portlights

Are they truly just trim or were they intended to seal the outside opening surrounding the port ? As you describe them as mounted from the inside what is there to prevent water intrusion from the outside around the edges of the port and (wood?) cabin top ?
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post #4 of 5 Old 10-25-2017
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Re: Utility of trim rings around opening portlights

All mine are integral to the water-tightness of the ports.

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post #5 of 5 Old 10-26-2017 Thread Starter
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Re: Utility of trim rings around opening portlights

What prevents water from getting in is the caulk between portlight and the cutout in the cabin wall. As an experiment I put two of the trim rings in (with more caulking, especially around the screws). The other two portlights I left the trim rings off and sealed the holes with epoxy. I have not observed any leaks yet from any of them despite copious rain last week. I also walked the docks and looked at other boats. Some trim rings have no screws ( at least externally visible ones). Many have different amount of screws holding the ring in place.
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