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Ask This Old House general contractor Tom Silva teaches a homeowner how to repair some structural problems in his home. Remove the old lally column with a grinder. Measure and mark the replacement column and cut it to size with the large pipe cutter.A Lally Column is an architectural term for a long, round, steel pipe filled with concrete that is oriented vertically to provide support to beams or timbers stretching over long spans. Lally Columns are typically positioned in the middle of the span to bear the weight of the structure, and to reduce the tendency of the structure to sag or flex.