Replacement mushroom vents for thick roofs?
I am new to motorhoming and caravanning, having just bought my first motorhome, a 13 year old Mirage 5000 in good condition. However I have had one problem- the previous owner fitted a replacement mushroom vent but was unable to find one that catered for
a roof thickness of around 6cm. So they used a smaller depth version which mean they were unable to screw the base to the top element as the base did not even meet the top, which in turn meant the top was only held down to the motorhome roof by the mastic
they used. This has quickly resulted in a serious leak...
I have looked on Amazon and eBay but so far all I can find are the standard smaller depth versions (circa 2.5cm max depth). I cannot be the only person to have had this problem of the older, thicker roof insulation requiring a deeper mushroom vent, but as
I am new to it I have no idea where to begin looking for replacements...
We have removed the old, cleaned and refitted as best we can, with plenty of mastic thickly applied and properly sealed, but I have no idea how long it will last without being held tightly to the roof, and we have a holiday booked in three weeks!
Help!