The paper introduces the precasted interlocking bricks and the essentials for protecting river levee's slope with the bricks and bricks paving methods.

This paper deals with features of water-proof PVC-roll-roofing used in roof construction, the methods of roofing slope designing, mortar float-coat and paving.

LECA lightweight grass paving block is useful for the grass or hydro seeding due to the grass can be alive in the slot and keep the soil slope stable.