Thank you for your comments. Firstly, DMX 1Step 2.0 does block the cold, please refer to the test page on our website https://dmx1step.com/product-test-result/, look for ASTM C518-17 Mod Floor Temperature Test, our product increases the floor temperature by 6.5 degrees C, also take a look at the hundreds of positive reviews that state the floors are warmer with DMX 1-Step 2.0.
As for stiffness of our product, please note that vertical deflection is one the main reasons for joint failure of vinyl and laminate floors, in order to have a successful installation there should be no vertical movement or deflection of the joint, DMX 1-Step 2.0 does an excellent job of this, please refer to ISO 4918 Chair Caster Test, which DMX 1-Step 2.0 passed easily, in this test the joints are tested under load for 25,000 cycles. Use of felt could increase vertical movement and potentially lead to failure of the joints. As for creaking noise, DMX 1-Step 2.0 has been tested for sound, it is one of the quietest underlayments in the market please refer to ASTM E492-09 and E90-09, our underlayment is so quiet that it is suitable for use in condos. It does not make any creaking noises. In addition, we would like to add no underlayment is as tested as DMX 1-Step 2.0 as is clear from all the test results on the Test Page of our website. Hope this answers all your questions.
Customer Care
DMX