Any ideas on an insulating material, with an easily cleanable surface to fit to the overhead surfaces of a plywood on frame deckhouse??? Doing the loop, the heat on the bottom of the ply would get too much on hot days.
Jon

One of the best insulating materials is that foam house sheathing material at Home Depot et al. To make it nicer, take some 3m headliner adhesive spray, and attach some cloth or vinyl to the white side, and mount with the foil side facing the ply. Any good construction adhesive should do.

The cleanable part is the hard part.

We prefer the material like the anti noise tiles found in commercial office spaces.

It id made these days in a planking that is insulation and very good at noise reduction.

Since its cheap and simply stapled in place it could cheaply and easily be thrown out every few years. The plank effect is OK , "nautical".

WE currently have 2 ft x 4 ft noise panels material with thin varnished battens supporting it , but this winter I am going to replace the pilot house roof and use this plank option.

Some extra overhang , a opening hatch for the engine removal hatch (instead of fixed), and a better mount for the vents , stronger air cond (RV exterior style) mount and a better location for the 75W solar are in the works. Along with more camber to make the roof look better.