Think you'll find 3.6 alittle easier to fix back as it will contour better. Unless you screw 5.5mm in place.
All depends on the finish that your after.
I know @DaveyB has recently done this and had to resort back to 3.6mm.
Believe so mate.
But you could use a combination of 5.5 and 3.6 depending on where n what your contouring.
@Absolut5
I've used 3.6mm all round with hidden clips. Fits well and looks neat. There's a variety of fixings available if you want to mount anything on the ply.
If you google “sound deadening shop” you will find their website, as they also sell insulation. I got 3mm dodo mat which I stuck over the sound deadening, then crammed a layer of the recycled plastic bottle fleece liner in as well. I still have half a roll of the fleece left.And whilst I have the attention of the wizards, will this suffice as deadening
Silent Coat 2mm Pack 20 Sheets Car Van Sound Deadening Vibration Proofing Mat | eBay
Along with some recycled plastic insulation from b&q???
Or my other option was - Camper Van Insulation Kit | Buy Online - Low-E.co.uk
Tho this is expensive, and not sure if the sound deadening would be any good... probably need silent coat and this... instead of the recycled plastic option?!
I also used a 4mm closed cell reflective insulation under the factory plywood floor, which just just sat on the the sound deading.
if you have the floor out, you can just trace it, or if you have a router, you can just use a flush trim bit with a bearing
Use the 5.5mm or thicker and forstner a rebate for the hidden clip in it? Just an ideaCurrently I have the factory panels carpeted with hidden clips but they are too weak.
I want to change them for ply so they are stronger. I like the idea of the 3.6mm so hidden clips can be used again but I'm thinking will I want the thicker size for fitting shelves or screwing in things to mount behind where the units will be. Maybe half and half?
Any tips?