EXPERT ADVICE
“ Cracks especially . You have to be careful of the cracks . Sometimes they are disguised as something else . A doorway , or a smile or even a winking eye . And if you fall through them , you never know where you will end up .”
From Australian novelist Isobelle Carmody , Greylands of chip seal , slurry seal , and overlay , the cracks need to be addressed prior to the top surface restoration or they will all reflect through the new treatment . Measure twice , document with photos , and supply a construction project map to the customer that clearly outlines the requirements for each area of the project .”
Part of managing customer expectations is explaining that all cracks allow water , moisture and materials like sand , dirt , and rocks to enter .
“ If you want the longest sealant service life , of seven years or longer , the best recommendation is to rout and treat cracks with high-performance crack sealant ,” stated Chris M . Vacca , senior marketing manager , Crafco , Inc ., Chandler , Arizona . “ The width of the crack should also be taken into consideration when designing your treatment plan .
• Hairline cracks are considered those that are less than 1 / 8 ” ( 3mm ) These may not be cost effective to crack seal if the pavement has a low density of hairline cracks , however all untreated cracks allow water and debris to infiltrate and should be sealed . Pavements with a moderate to high density of hairline cracks that are planned to have a surface treatment should be pretreated with crack sealing prior to the surface treatment to ensure that those cracks that may be high-moving are sealed .
• Cracks that range from small 1 / 8 ” ( 3mm ) to large 1 ½ ” ( 38 mm ) should be routed to clean and prepare the surface and to create a defined reservoir ; then filled with crack sealant .
“ For cracks that are too wide to treat with crack sealant , greater than 1 ½ ” ( 38 mm ), you will want to seal them using long-term performance products like sealing mastics . Sealing mastics will repair wide cracks by providing strength and flexibility . They are a sealing product that have been fortified with aggregates to add stability in wider , deeper applications .”
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