Slideshow: Build a New Foundation

Hand Mixing

With limited space and limited exterior access, the crew had to mix all the concrete for the footings by hand. Read original article.

Filling the Footings

The crew kept mixing and dumping batches of wet concrete into the trench until the footing was level with the basement slab.

Vibrate for Density

To remove air bubbles in the mix and to maximize the density of the concrete for the footing, the crew vibrated the wet concrete mix after filling up the footing trench.

Floating a Finish

Vibration not only consolidated the concrete, but also brought more liquid to the surface, making it easier for the crew to smooth the wet concrete surface of the footing with a float.

Block Wall

Masons built the foundation walls out of Dry Block CMUs (which are made from water-repellent concrete).

Rebar Grout

Where vertical rebar extended up through the block from the footing, the crew packed the cores with grout.

Different Block on Top

The masons capped the walls with a course of bond-beam blocks, which were tied to the lower block courses with short lengths of rebar.

Reinforced Cap

After filling the bond beam blocks partially with wet concrete, the crew installed horizontal rebar.

Final Surface

With the rebar added, the crew filled the rest of the bond block with wet concrete, giving the top a smooth surface.

New Mudsills

With the block wall finished, the crew replaced the old mudsills with new treated sill stock, using inflatable shims and heavy-duty pry bars to hold the new plates tight against the bottoms of the existing studs for fastening.

Attaching the Sills

After pushing the sill stock tight against the bottoms of the studs, the crew drove galvanized toe screws through each stud and into the sills to hold the sills in place.

Final Gap

The crew filled the gap between the block foundation and the sills with high-strength non-shrink grout, forcing it under the sill from the inside with a margin trowel.

Finish Filling In

The crew also used the margin trowel and high-strength non-shrink grout to fill the gap from the outside.

Smooth Transition

The crew used an edging trowel to smooth the grout along the top of the foundation and to smooth the seam between the existing foundation and the new block foundation.

Standing on Its Own

After allowing the grout to cure, the crew removed the needle beams, leaving the corner of the house fully supported by the new foundation and sills.

Mudsill Bolts

The crew anchored the mudsill to the new foundation with Simpson Titen bolts.

Removing Temporary Support

Finally, the crew was able to remove the LVLs that had offered temporary support while the foundation was being rebuilt.

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