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mikeb
90 Posts |
 Posted - 10 Aug 2012 : 13:38:51
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| My Norman 20 has a twin skin grp cabin roof. There must be only a few mm void between them (or even touching in places). I've ot quite a few items that I'd like to mount on the roof - headlights, horn, maybe a short mast for the nav light. Whats the best way to do this - bolting straight through both skins looks easiest, but that will leave the cabin ceiling looking a mess?? |
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Peter Walker
United Kingdom
58 Posts |
Posted - 10 Aug 2012 : 21:41:22
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I am not sure about the more highly loaded stuff like a mast, but small items like lights and ventilators that don't have large forces on them, I think can go into pockets of body filler or epoxy and filler. Do not just screw into the wood core of the outer skin - it will work absolutely fine for a few years but in the end you will always get water into the wood and it will rot inside. Drill an oversize hole, fill the hole flush and allow it to harden, drill a small pilot hole and secure the fitting.
Norman 22 on the river Avon, Warwickshire |
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cliveshep
Thailand
1324 Posts |
Posted - 11 Aug 2012 : 08:07:30
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What I have done on the two Normans I have worked on is fix the mast tabernacle onto a stainless steel backing plate, bonded that down to the roof with a Sikaflex type mastic, and then a pattern of short self-tapping screws.
This gives a good fixing spread over a larger area and obviates bolts coming through the internal ceiling lining.
You can get into the small gap between lining and coach roof via the hatch if you are patient. Wiring can then be led via the toilet ceiling to the console. What I have done on several occasions is remove the hardwood trim around the hatch, or ali trim dependant on what model you have, and cut a hole through the part covered by the trim.
It's a bit fiddly even with a "fish-wire" and on some models there are actually THREE layers, coach roof, intermediate stiffening panel and the inner lining moulding that can make it well nigh impossible.
However, adding a ceiling light allows you to cut a hole above it, later hidden by the light, and thus access the small void to assist cable routing.
The cost of boating is insignificant compared to costs of a young wife and two teenage kids! |
Edited by - cliveshep on 11 Aug 2012 08:09:04 |
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Knighty
United Kingdom
654 Posts |
Posted - 14 Aug 2012 : 10:36:48
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Why not mount lights and horn on the bow top which are where mine are then you have access from in the cabin to bolt them down as it's only single skinned but thicker.
I fitted a small solar panel panel to the cabin roof and i used a high strength double sided tape on the brackets which were flat alloy about 18"x1" rather that screwing it down. |
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Mounting stuff on the cabin roof
