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Old October 7th, 2013, 05:33 PM
ssi19's Avatar
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Location: new york, ny
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Fiberglass Top - insulation success?

Im thinking about buying a D90 OEM fiberglass top for winter. But I see lot of threads about how they stink (loud road noise, water leaks, thin / brittle plastic etc) . Has anyone tried insulating one of these? Seems that might help with all of the aforementioned issues with these tops...
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Old October 7th, 2013, 07:18 PM
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Chris Snyder
1994 D90 #614 | '07 L322 SC
Join Date: Feb 2006
Location: Newburyport, MA
Posts: 1,544
I have yet to own a plastic/fiberglass top, but basic sound deadening technique would say that those who complain about them have done nothing to sound proof or insulate the bottom side of their trucks first. There isn't a whole lot of noise that enters from the top of a vehicle (aside from wind noise at the joints). A little bit of dynamat/luxury liner pro in the seat boxes, doors, around the firewall, and in the tub go a really long way quieting down even a soft top defender. Often times you can achieve up to a 6dB reduction in noise with relatively little effort. And that's a pretty noticeable improvement. Sealing up air leaks is probably the most effective tactic.

A fiberglass/plastic top has a very reflective surface on the inside, which doesn't do you any favors when you've got lots of noise transmitted upwards from the bottom of the truck. I would guess a headliner or any sort of absorption material on the surface would go a long way.
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Old October 8th, 2013, 12:36 PM
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Clay DeWan
5.3L beastie
Join Date: Feb 2008
Location: Raleigh, NC
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I have run the fb top. I had did not have any problems with leaks but the. Again I am in SoCal so torrential downpours are not common. I had by body shop spray the inside with a sound absorbing paint in white. The white really help to brighten up the inside of the truck. Like the post above most all of my noise is from tires, drive train etc. you may want to drive with someone who has a badger to see how quite those tops are
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Old October 11th, 2013, 02:06 AM
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97 Defender 90
Join Date: Feb 2011
Location: San Diego
Posts: 155
I am looking at taking a lot of my inside out over the winter and getting it sprayed with deadner. I didn't buy the rig to be super quiet but I would like to have a convo without talking loud.
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