Plate compactor / tamper A heavy, motorized machine with a flat steel plate that vibrates rapidly to consolidate loose soil, sand, or gravel subgrade before concrete is poured.
Pouring high-quality concrete over loose, uncompacted soil is a recipe for premature sidewalk failure. A plate compactor is used to firmly pack down the 6-inch crushed stone base required under NYC sidewalks. This consolidation prevents the soil from settling or shifting under pedestrian and vehicle loads over time. Utilizing a plate compactor is a vital step in clearing DOT sidewalk violations, as it prevents the new flags from sinking, cracking, or shifting.
Frequently Asked Questions About Plate compactor / tamper
What is a plate compactor?
A motorized machine with a vibrating steel plate used to consolidate soil, sand or gravel before concrete is placed.
Why is compaction so important?
Concrete poured over loose material settles under load, causing cracked, sunken and rocking flags within a few years.
What gets compacted?
Both the soil subgrade and the crushed stone base, worked in layers rather than all at once.
Is a compactor required?
Mechanical compaction of the subbase is standard practice for compliant NYC sidewalk work, and skipping it is a common cause of premature failure.