Quote Originally Posted by csm View Post
I'm in the process of building a sealed sub enclosure for my 2013 LSV. I'm using 3/4 birch ply, and planning on coating with bedliner.

My boat has the hump that is made of fiberglass, not carpet. My plan is for the bottom of the enclosure to sit on the hump, anchored by l-brackets. It will follow the angle of the hump. I'm going to have a facade with either carpet or vinyl covering the front.

My question is, do I need a dampener (carpet or foam strips) between the bedliner of the enclosure, and the fiberglass hump? I'm just wondering if these surfaces will cause a bit of rattling. The enclosure will be several inches above the floor, so moisture shouldn't be a problem.
csm,
Once you have an enclosure build method that protects the enclosure from failure due to water damage then the next concern is providing for drainage and evaporation under the enclosure, for two distinct reasons. First, moisture over time can wick up through most any protective but micro porous surface coating. The bottom seams are always the first point of failure. Even fiberglass hulls can eventually blister on a boat that stays in the water. Second, you have to counter mold and mildew growth and the resulting odor issues to follow. An enclosure resting on carpet is a real problem. So if the enclosure is riding up on the hump then lay down several narrow polymer strips as a buffer between the enclosure bottom and boat surface. 0.375" thickness is enough.