Architectural and Engineering Glossary



An S-shaped trap.


Abbr. for Brit.standard wire gauge.


 Abbr. for “shipped assembled.”


In the lumber industry, abbr. for “surfaced one side and edge.”


 Abbr. for “studs and girts.”


Abbr. for “surfaced and matched.”


In the lumber industry, abbr. for “surfaced one edge.”


Abbr. for “surfaced one side.”        


Abbr. for “surfaced one side and one edge.”


Abbr. for “surfaced one side and two edges.”


Abbr. for “surfaced two edges.”


Abbr. for “surfaced two sides.”


Abbr. for “surfaced two sides and center matched.”


Abbr. for “surfaced two sides and shiplapped.”


Abbr. for “surfaced two sides and one edge.”


Abbr. for “surfaced four sides.”


Abbr. for “surfaced four sides and caulking seam.”

Sabbath House, Sabbath-day House

In colonial New England, a small house having but a single room with a fireplace at one end, usually located near a house of worship; used on Sun  days by a family as a place in which to warm and feed themselves during breaks in the all day religious services, because such services typically were conducted in unheated meeting houses. Occasionally several families shared a two room house with a centrally located fireplace; others had a small two story house for this purpose, with the ground floor used as a stable. Also see Sunday house.        

Saber Saw

A power driven saw with an oscillat- ing blade which extends through the base of the saw; has an action similar to that of a jigsaw.


A unit of sound absorption equivalent to1 sq ft of perfectly absorptive surface. Also see metric sabin.

Sable Writer

A long sable, esp. one used in lettering signs.

Sable, Sable Pencil

A fine paintbrush made of hair of the tail of the sable.


A small Roman sanctuary, usually an unroofed enclosure with a small altar.Some times, a roofed funerary chapel.


See bag.

Sack Finish

See sack rub.

Sack Rub, Sack Finish

A finish for formed concrete surfaces; designed to produce even texture and fill all pits and air holes; after the surface is dampened, mortar is rubbed over it; then, before it dries, a mixture of dry cement and sand is rubbed over it with a wad of burlap or a sponge rubber float to remove surplus mortar and fill voids.


Any consecrated place, in Roman or medieval architecture; a shrine, a chapel, or a sacristy for keeping liturgical objects.

Sacrificial Anode

A metal plate used in cathodic protection (i.e., the protection from corrosion) of piping or other equipment to which it is electrically connected. This metalplate must be more corrodible than the piping to which it is attached.

Sacrificial Protection

The use of a metallic coating, such as a zinc rich paint, to protect steel. In the presence of an electrolyte, such as salt water, a galvanic cell is set up and the metallic coating corrodes instead of the steel.

Sacrificial Timber

A timber which is purposely oversized to enhance its fire resistance.


A room in a church, near the chancel, where the robes and altar vessels are stored, where the clergy vest themselves for services, and where some business of the church may be done; usually a single room, but sometimes a very large one.

Saddle Bar

One of the horizontal iron bars across a window opening which secure the leaded lights.

Saddle Bead

A type of glazing bead used to secure two panes of glass.

Saddle Bend

A saddle-shaped bend in a conduit, where it crosses another conduit, in order to clear it.

Saddle Board

A board at the ridge of a pitched roof which covers the joint at the ridge. Also see comb board, ridgeboard.

Saddle Coping

A saddle backed coping;see saddleback, 2.

Saddle Fitting

A fitting for making a connection to a pipe which is already installed; clamped to the outside of the pipe and sealed with a gasket.

Saddle Flange

A curved flange, usually welded or riveted to a tank, boiler, or the like; shaped to fit the curved surface and receive a threaded pipe.

Saddle Flashing

Flashing over a cricket. 

Saddle Joint

1.A stepped joint in a projecting masonry course or in a coping; used to prevent the penetration of water. 2.A vertical joint in sheet metal roofing; formed by bending up the end of one sheet and folding it downward over the turned up edge of the adjacent sheet.

Saddle Notch

At a corner in log cabin construction, a rounded notch cut near one end in the lower surface of a horizontal log; forms an interlocking joint when mated with a similarly notched log set at a right angle to it. Occasionally, this term is also used for a double saddle notch, which is cut in bothsides of a round log; in such instances, the logs at right angles are unnotched.

Saddle Piece

In sheet metal roofing, a metal cricket.

Saddle Roof

A roof having a concave shaped ridge with gables at each end of the roof, this configuration being suggestive of a saddle.

Saddle Scaffold

A scaffold erected over the ridge of a roof; esp. used for repairing chimneys.

Saddle Stone

1.An apex stone.2.Obsolete term for a stone containing saddle shaped depressions.

Saddle Tie

1.For wire hangers, the attachment  of wire hangers to main runners. 2.For furring, the attachment of furring members to framing members of wall or ceiling assemblies by the use of a single or double strand of wire.

Saddle-jib Crane

Same as hammerhead crane


1.A saddle joint.2.A coping stone having its top surface sloped with its high point along the center ridge, so that rainwater spills on either side; also called saddle backed coping.

Saddleback Board

Same as threshold.

Saddleback Coping Brick

Same as saddle back, 2.