Remove hearth extension forming boards

Heating · Wood Burning Fireplaces · printed page 187 (PDF page 188)

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Book index entries

Extension Forming Boards – Removed Hearth – Extension Forming Boards – Removed Wood Fireplaces

Text in the illustration

chimney
firebox
crack
forming boards should be removed after the concrete has cured
floor joist
cross section through chimney

Generated explanation

The illustration shows a cross section through a masonry fireplace and chimney, with a concrete hearth extension adjoining a wood floor joist. A circular enlargement highlights a forming board remaining beneath the concrete hearth extension. A crack is identified in the concrete above the board. The annotation specifies that forming boards should be removed after the concrete has cured.