How To Repair Uneven Concrete Under A Sill Plate
How to Repair Uneven Concrete Under a Sill Plate. During foundation construction, the contractor forms and pours the walls, leveling the wet concrete with the tops of the forms. While this usually provides a relatively level concrete surface on which to install the sill plate, some types of wall forms have support boards that span the tops of the forms, making it difficult to get the wet concrete perfectly level. The risk of an uneven wall increases if the concrete begins to harden before the tops of the walls are even. Leveling the uneven spots provides a better base for the sill plate.
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