Larsen Streetscape PS Eco bonding mortar is specifically formulated to exceed the ≥2 MPa adhesion bond strength necessary for bound system B as set out in BS 7533 part 101 (Code of practice for the structural design of pavements using modular paving units) when measured in combination with Larsen Streetscape FBC Eco permeable bedding mortar & Larsen Streetscape FBC Eco bedding mortar. Eco – Reduced Carbon. PS Eco is the equivalent to carbon absorbed by growing one tree for 10 years or not driving a car for 107 miles per tonne of product used.