Before Starting Work on the Arrangement of Waterproofing, The Surface of the Surface SHOULD OUT AUT USING SPECIAL MISTURES. After the Primer Dries, A Roofing Ruboroid is Laid, Which is Attached to the Roof with a Mastic. USULLLY WATERPROOFING MATERIAL IS LAID in Several Layers for Maximum Protection Moisture. The Last Layer of Roofing Material is Additionally Covered with A Massive Layer of Mastic. IF Especially Severe Waterproofing Is Required, it is Also Possible to Cover the Roofing Material of Gravel Or Sand on Top.