Thoroughly compact the subgrade and base material adjacent to the apron and slope the asphalt lot to minimize water penetration at the joint.
Expansion joint between asphalt and concrete.
It is waterproof permanent flexible and self sealing.
A sealant is not required.
Asphalt expansion joint is composed of a blend of asphalts vegetable fibers and mineral fillers formed under heat and pressure between two asphalt saturated liners.
When this happens weeds and grasses take root in the gap.
When i called sika the company that makes the self leveling sealant for this kind of project they told me to use a utility knife to remove old material and clean off any remaining residue with acetone.
If you look at the expansion joints between your concrete you might see black felt or old sealant.
If you re stuck with an asphalt parking lot the best approach is to pave a concrete apron around the building with a slope that will ensure adequate drainage away from the building.
Contraction joints a re placed between the expansion joints.
By william machin over time the wood or composite expansion joint that separates concrete and an asphalt surface can deteriorate.
In the past some engineers used combinations of expansion and contraction joints in an attempt to re lieve compressive stresses.
Asphalt expansion joint should be recessed 1 4 6 35 mm below the concrete surface.
Old sealant and worn out felt needs to be removed.
Asphalt is flexible pvmt conc is rigid pvmt it would be extremely unusual to find a sealed transition joint in residential work while its common on military airfields haven t yet seen an apron vest store carry the correct size backer rod for your however you don t need it clean out the joint clean install duck tape on the bottom seal w dow 890sl or equivalent no thicker than 3 8 depth if the blacktop is 6mos old or more this will probably work if its new.
Fibre expansion joint ceramar sponge rubber expansion joint cork expansion joint and self expanding cork expansion joint should be recessed 1 2 12 7 mm below the concrete surface to accept the joint sealant.