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Water Ingress Spongy Ceiling


Fiat Ducato

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Fiat Ducato - 2015-03-29 11:50 AM

 

...My plan is to pre fabricate the panels in 4 sections before carrying them in and fitting up into place, they will be 2032mm length by 1220mm wide, with the timber structures and celotex already fixed bonded to the oil tempered hardboard (to go against the Alloy skin) then late I will fit a finshing layer of either proper motorhome wallboards (white) with joining strips or exterior ply finished with some similar matching vinyl wallpaper, with joining strips to allow movement.

 

It’s likely that, when your motorhome was built, the shape of the roof’s inner structure allowed the aluminium outer skin to fit tightly against hardboard beneath, and I’m not sure if you’ll be able to achieve the same snug fit using the method you are proposing.

 

This may not matter if the aluminium is reasonably thick, but if it’s not you might consider strengthening (and hail-proofing) it with a rubberised top coating as used on many RVs. For example

 

http://www.motorhomeroofrepair.co.uk/home

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