Enlarging opening in attic concrete floor slab for a new chimney. Tools used: rotary hammer drill (small SDS+ and large SDS MAX), large angle grinder, plumb line, old broom, safety gear. The chimney is made of concrete elements into which fireclay tubes and thermal insulation are inserted. Steel rebar connects the concrete elements and prevents them from sliding around. This chimney system is essentially the same as the one made and sold by Schiedel, although this particular system is made by Ekoker, a Slovenian company.
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