Steps
1. Remove any vegetation growing in cracks.
2. Install Petrotac, a needle-punched nonwoven polypropylene fabric, coated with asphalt     cement and a rubberized asphalt adhesive. 
3. The properties of Petrotac are listed below:
 Property
Test Method
 American Standard
Strip Tensile
ASTM D882
50 lb/in
 Puncture
Resistance
ASTM E154
200 lb
Permeance
ASTM E96
Method B
0.10 perms (max)
Pliability
ASTM D 146
No cracks in fabric
or rubberized asphalt
4.  In most instances Petrotac will be installed just before the parking lot is overlayed.
5. When necessary,  area will be blocked off to traffic during the Petrotac operation and will be reopened to traffic as soon as it has set.
6. It is the responsibility of the owner to clear the pavement area being Petrotaced.