Salem Seal Coating and Willamette Asphalt Maintenance
Questions and Answers

What causes asphalt pavement to fail?

Assuming that the initial asphalt pavement was designed and constructed properly, the primary cause of failure is the penetration of water into the asphalt base. This process begins with the oxidation of the pavement surface which causes the asphalt to dry and become brittle. This leads to the erosion of the top layer of fine particles and the appearance of larger stones and small cracks on the surface.

If left untreated, these cracks expand and eventually allow water to penetrate through to the base of the pavement. When this occurs, the base material moves and settles, leading to an "alligator hide" appearance. When the pavement reaches this stage, the only option is removal and replacement of the old asphalt.

When should seal coating be done?

Generally you should wait a few months before sealing new pavement to allow it time to cure. The A.S.M.A. recommends waiting 6-12 months before seal coating new pavement.

After a surface has been sealed it should be resealed every 3-4 years or as necessity dictates.

Are all sealers the same?

No. You should use a seal coat material manufactured by a member of the Asphalt Seal coat Manufacturer's Association. Members adhere to the strict A.S.M.A. standard specification in manufacturing their material which ensures a quality product which meets or exceeds the standard spec.

What are seal coats?

Seal coats generally consist of a mixture of emulsified asphalt, water, mineral fillers and various other admixtures. They are applied directly to the surface of an asphalt pavement with a rubber squeegee, broom or mechanical spray.

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