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flat arch

Also called: jack arch, straight arch
HB50
arch with a level soffit and extrados, or with minimal curvature
See Figure A.15
Usually made of wedge-shaped, gauged or moulded masonry blocks which radiate from one centre. Used over doors, windows or fire-place openings. Sometimes used to describe post and (cambered) lintel construction.

Figure A.15: Masonry arches (I)

HB50
flat arch