We focused on isolation materials in the thesis. More specifically they are acoustic isolation pads based on recycled textiles from automobile industry STERED. The work is divided into several parts. In a general analysis we dealt with problematics of building materials especially those which are used in building for purposes such as thermal and acoustic isolation. Following the theoretical part, the experimental part of the work is a summary of the results of the evaluation of three types of isolation pads – STERED ID (without surface finish), STERED ID-K (glass wadding) and STERED ID-MF2 (double acrylic varnish), first, in terms of their behavior at direct exposure to burning (the test of ignitability according to STN EN ISO 11925-2), and also when the radiant heat is applied at the activity of infrared emitter. The results of the first testing method clearly demonstrated that under STN EN 13501-1+A1 the samples of all three tested materials met the criteria for classifying to the reaction category of the flame E and after meeting the classification criteria STN EN 13823 to even higher category. The radiant heat source test showed that the highest weight loss had the sample STERED ID-K (24,47%) and STERED ID with STERED ID-MF2 had the weight loss almost the same (ca. 19,5%). The important result is also that none of the testing samples were set on fire during the radiant heat source test.