Want to add noise proof material to the door? What material is good?
Estimation is the splint hollow gate, on the door of drilling hole 10mm, foam injection. Then do a double line cutting, with 502 stick flat O sealing strip. 30 decibels down. No problem.
A sill can be placed at the bottom, then a sealing strip is affixed to the inner surface of the doorframe, or a soft flexible rubber strip can be used instead of the sealing strip.
If the seal is no problem, you can consider using your rubber plate affixed to the door, the more layers of paste, the better the effect.
First look at the door, the bottom of the door sealing how?.If the seal is not good, even through the great, how do noise are in vain.
