Sealing a hole in the roof..

Jan 7, 2019
23
1
Funster No
57,882
MH
Hymer B524
Exp
Currently knocking about in a part converted Trafic...
I’m removing the satellite system and telly in our B524.
The easy to remove gubbins inside is already gone but I need to remove the satellite dish on its pole from the roof which will leave an 85 mm hole..
Any advice on filling and sealing this?

Current though is to carefully cut up a fridge freezer compartment door I liberated from the local recycling place and glass/silicone seal into the hole.
Alternatively buy a sailing dinghy hatch cover and rivet/screw/silicone seal into place.
 
Sep 26, 2013
2,177
1,476
Market Rasen
Funster No
28,295
MH
Self Build
Exp
Since 2003
Normally settalite dishes are fixed to a plate which is either stuck or screwed to the roof, when you remove the dish you leave the plate in place. Never seen a dish on a pole.
 
OP
W
Jan 7, 2019
23
1
Funster No
57,882
MH
Hymer B524
Exp
Currently knocking about in a part converted Trafic...
Normally settalite dishes are fixed to a plate which is either stuck or screwed to the roof, when you remove the dish you leave the plate in place. Never seen a dish on a pole.
This is a manual dish that you tilt/rotate from inside the MoHo on a pole..
 
Sep 26, 2013
2,177
1,476
Market Rasen
Funster No
28,295
MH
Self Build
Exp
Since 2003
This is a manual dish that you tilt/rotate from inside the MoHo on a pole..
I have a manual crank up dish but it’s not on a pole, However if you have a hole just use an oversized piece of aluminium or plastic stuck down with Sika 512 or similar.
 
May 31, 2015
4,837
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Cornwall
Funster No
36,638
MH
Hymer B544
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An expensive experience.. still..!
Stick a piece of chequer plate over the hole giving a couple of inches overlap and stick down with sika flex....

What you do with the inside is up to you but it would be good access for any future accessories you add ie: solar/mifi aerial etc....
 
OP
W
Jan 7, 2019
23
1
Funster No
57,882
MH
Hymer B524
Exp
Currently knocking about in a part converted Trafic...
In the end I up cycled a domestic fridge freezer compartment door which I cut a square of plastic from. I trimmed this to perfectly mate to a stainless steel vent plate from our local yacht chandler , spread silicone sealant over all the mating surfaces and around the hole in the roof then screwed it all down snug with 6 stainless steel screws- which were coated with silicone before mounting.
From the inside I smeared all around the (thick!) insulation in the roof with more silicone and will cut a plug of insulation from the fridge door to ensure no cold bridge.
Just waiting for some rain now....
 
OP
W
Jan 7, 2019
23
1
Funster No
57,882
MH
Hymer B524
Exp
Currently knocking about in a part converted Trafic...
“Generally speaking, silicone sealants are more versatile and flexible than polyurethane sealants and they work better in most environments. The inorganic composition means that silicone is resistant to UV rays, making it a better option than polyurethane sealant, which will eventually revert back to its natural form.”

I’ve been using silicone sealant for many,many years on my boats- all of which are still afloat:)
 
OP
W
Jan 7, 2019
23
1
Funster No
57,882
MH
Hymer B524
Exp
Currently knocking about in a part converted Trafic...
Silicon is useless for this purpose & why more screws?
1. Why useless?
2. ‘Cos the plate has 6 holes
machined into it, would be rude not to use them.
 

pappajohn

LIFE MEMBER
Aug 26, 2007
36,025
24,054
Dark side of the moon
Funster No
172
Exp
Since 2005
1. Why useless?
2. ‘Cos the plate has 6 holes
machined into it, would be rude not to use them.
6 holes, 6 screws, 6 potential sources of water ingress.

If Sikaflex is adequate on its own to secure solar panels and satellite dish mounts without screws its certainly adequate to hold down a foot square flat plate without screws.
It's also used by the converter to secure door and window frames, body joint trims and roof lights.
 
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