Date: March, 2011
Location: Residential unit, Davidson MI
Contractor: Smith's Waterproofing
A sill plate or sole plate in construction and architecture is the bottom horizontal member of a wall or building to which vertical members are attached. The vertical members of the framing called studs can then be constructed on top off the sill plate, which is anchored to the concrete foundation. This allows a flat, even surface for the construction of the framing and a buffer between the framing and the foundation. Many houses do not have a sill plate.
In this case, residential Basement poured concrete walls were tilting inward from lack of sill plate creating major cracking and deflection which were repaired with epoxy injections, carbon fiber staples, Kevlar neckties and carbon Kevlar grid straps.
Residential Basement 10" poured walls were tilting inward from lack of sill plate creating major cracking and deflection.
Several problems had to be considered in order to effect repairs. One issue was the overburden load on the perimeter walls. The backyard elevation was nearly as high as the top of the basement foundation wall. A swimming pool and patio was already in place, consequently the grading could not be lowered with excavation not an option. Another concern was the removal of large areas of the floor in order to install all new deeper support pillar footings and stabilize a large stairway into the basement. Removal of floor sections to install deeper support pillar footings would possibly cause the perimeter footing to shift or fail.
The perimeter walls needed to be stabilized before any other repairs could be started. Design specifications called for 93 Fortress Carbon Kevlar grid straps 9' high installed from floor to ceiling at spacing varying from 2'0"-3'4" on center. 75 locations at the bottom of the block were also to be grouted at spacing varying between 2'0"-5'0" on center for shear protection. A section of wall beside a stairway would require 6 helical wall anchors be installed to prevent the wall from shifting at the bottom once that floor section was removed.
Epoxy injections, carbon fiber staples, Kevlar neckties and carbon Kevlar grid straps were installed for given problems on this foundation.