I want to stick some 25mm sheets of jablite insulation to the inside my(wooden) garage roof,roof is made of OSB and as the jablite is, as we know, polystyrene so I'm not sure what to use to fix it to the roof,obviously it has to be solvent free or it will "melt" the jablite,have tested a bit with some silicone but that doesn't seem to take to the jablite very well(I can peel it away when it's gone off)..any ideas chaps?