Good - Absorbalay 15
When we met you stated you wanted to improve the soundproofing of your floor, with particular reference to impact sound, Absorbalay mats is a good choice as they are designed to reduce impact and airborne sound specifically.
From an impact sound perspective this an excellent product and delivers very good results in high traffic areas such as hallways and stairs.
The Absorbalay 15 mat weighs 15kg /m2 it acts to reduce airborne sound by increasing floor mass and resilience (springiness). In addition, by sealing the gaps in the floorboards as well you are bringing into play the wooden floor which acts as a reasonable soundproofing surface when all the gaps are sealed.