Rough Opening - The frame wall opening to receive a door or window unit.
Rough Sill - The bottom rail of a window rough opening.
Rubble - Masonry construction using stones of irregular shape and size.
Rough Opening: A framed opening in which the unit will be installed.
R-Value: The measurement of resistance to heat transfer in a material. The higher the R-Value, the greater the insulation value.
Rough opening
The framed opening in a wall into which a window or door until is to be installed.
Sash A single assembly of stiles & rails made into a frame for holding glass ...
Rough opening: The opening left in a frame wall to receive a window or door unit.
Header - This term applies to several construction features; - The top horizontal support of a rough opening - The support for joist-ends on the foundation walls sill - The support for joist-ends in a floor or roof opening ...
French Casement Window - Two casement sashes, each hinged on one stile and opening in the middle with no center mull but with a half lap connection. This allows a smaller rough opening to make egress since there is a large unobstructed opening.
 See also: Door, Frame, Member, Sill, Molding
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