Ask This Old House Season 3 Episode 11
Episode Title Ladder Safety; What Is It? Replacing an Old Retaining Wall
Kevin heads outside the barn to learn about ladder safety from expert John Drengenberg. Up at the loft, Kevin, Tom, Richard and Roger ask, ""What Is It?"" Then, Roger rebuilds a crumbling retaining wall with homeowner Colin White of Wakefield, Massachusetts using interlocking concrete blocks.
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