Fieldstone
1. Loose stone found on the surface or in the soil.
2. Slabby units, flat in the direction of bedding or lineation of the rock, and suitable for setting as dry-wall masonry. Glacial or alluvial boulders and obbles, found in or on the soil, are not fieldstone in strict sense. *
Return to Top
Firebrick
Brick made of refractory ceramic material which will resist high temperatures; used to line furnaces, fireplaces and chimneys. *
Return to Top
Flagstone
A flat stone, usually 1 to 4 in. thick, used as a stepping-stone or for terrace or outdoor paving; usually either naturally thin or split from rock that cleaves readily; sometimes produced by sawing.
Return to Top
Flashing
A thin impervious material placed in construction (e.g. in mortar joints and through air spaces in masonry) to prevent water penetration and/or provide water drainage, esp. between a roof and wall and over exterior door openings and windows. *
Return to Top
Flemish Bond 
A bond in which each course consists of headers and strechers laid alternatively; each header is centered with respect to the stretcher above and the strecher below it. *
Return to Top
Flush Joint
Any joint finished flush with the surface. *
Return to Top
Fluted Face, Flute
A groove or channel, esp. one of many such parallel grooves, usually semicircular or semielliptical in section; used decoratively, as along the shaft of a column. *
Return to Top