ticki2 wrote:
There would be no need for a vapor barrier between the aluminum and plywood , the aluminum , especially if one sheet , is in effect a vapor barrier . Add to this that is the wrong placement of a vapor barrier which should be on the inside wall ( warm side of insulation ) it becomes a negative . On a TC which usually has an impervious material as an outside skin I question if a vapor barrier should be used at all , even on the inside . Some how the wall has to breath or condensation will be trapped and eventually cause problems . Unless of course you can vacuum seal it or fill it with gas as in thermal windows , but I doubt that is practical .
ticki2, but then why did he put the vapor barrier right under the aluminum and nobody on the 11 page roof rebuild thread said anything negative about it?
