When cracks appear in asphalt, it is important to seal them properly. If not, water, dirt and debris entering the crack will create further deterioration through movement of the subgrade. This will result in additional decaying of the asphalt surface.

We provide two options for the sealing of cracks, hot pour and cold pour.

All cracks, generally from 5-25 mm, in width, are routed to 19mm width x 19mm depth. The cracks are then cleaned with min. 185 cfm compressed air to ensure a clean surface for sealing. The prepared cracks are then sealed with a rubberized asphalt sealing compound, either Hydrotech 6160 (ASTM D-1190) or Crafco 221 (ASTM D-3405).

Normal set-up time for the material is about 15 minutes. When necessary, the material is given a dusting of Portland cement to facilitate immediate traffic without and tracking. (Once set, the material will not track again). Under normal conditions, the material will exhibit a failure rate (some splitting along the sidewalls or in the material itself) of 10-15% after the first year or two. This is usually not a cause for concern, however, as in most instances this occurs only in the coldest months and the joint will reseal in April or May, thus keeping out the moisture during the wet warm months. This splitting usually occurs in joints which have a very high movement during the freeze/thaw cycles. The material should be able to withstand a movement of approximately 100%, meaning that the joint should be able to expand to approximately 1" before any splitting occurs. The generally accepted view is that this material should provide from 3-5 years life expectancy, and should increase the life expectancy of the asphalt from 3-5 years if applied properly and at the right time (2-5 year old asphalt).

All cracks are pressure air cleaned to remove loose debris. A rubberized sealer is applied to the surface and squeegeed to provide an overband.

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