fireman11 Posted October 25, 2010 Report Share Posted October 25, 2010 With the fireplace bricks (floor) mortared in place, lay out the side walls and back wall.Fireplace Forms are designed for three standard firebox sizes. 36, 42, and 48 inch wide openings. The recommended dimensions for the Fireplace are; Depth of firebox = 1/2 width of opening Width of back wall = 1/2 width of opening Height of fireplace opening = width of opening. [:-alien] Quote Link to comment Share on other sites More sharing options...
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