Firstly, I feel i should say i really appreciate your imput Rick.

| On July 24, 2018 11:02:36 PM UTC, "Rick Willoughby wrote:
| The panels in the fire test were clad with aluminium commonly used in cool room construction.

Maybe. The video is entirely unsourced afaict. And the video is of the far more flammable EPS. Perhaps you know more about it. But the only cold room I ever worked on the metal panels could not fall off the insulation when it got hot. They were mechanically fastened to metal risers. But i know nothing.

Having a fire safe sheet fall off when it gets hot seems the kind of dumb that kills people.

| This link provides a paper that discusses the fire issue of insulating foams in more detail:

Afaict that 'paper' is a fire safety seminar power point and has nothing salient to the point. Yes, foamed plastic burns. Yes, people building buildings wrong do stupid, dangerous stuff with it. How is any of that on point?

Surely, we all agree that most buildings with foam insulation are not catching on fire and are fire safe.

| It is the melting and dripping of XPS then vaporisation that causes the rapid spread of fire. PVC burns more like wood with charing and does not melt and flow.

As I said, PVC is safer if you are parking your boat near flaming trashcans, i guess. But lets be clear, in any sort of fire event that is a threat to a boat, if the boat is cored in pvc, it will not survive because of the pvc core, right? PVC core does not help in a fire. While it might not drip or flow, certainly the whole rest of the boat will be a flame, which will be the noticeable problem. Or do you see a pvc cored ship standing proud and safe around its flaming peers? Epoxy burns, right?

| I have two types of XPS insulating foam at home. Both purchased within the last two years in Australia. Neither are self extinguishing. Both drip as they burn.

So you built a glass panel and the XPSS dripped through the glass?

| The H80 PVC foam I have here is self-extinguishing and does not melt when it burns.

So, when you lit the glass panel you built with H80 it did not burn?

| The linked paper indicates the importance of the overall building. system. Building a one-off boat using XPS is not going to be a proven system from a fire rating perspective.

Are you suggestion a PVC cored epoxy glass boat is a proven fire safe system? As opposed to the provably unsafe same boat in XPS?