Friable
Soil that is easily crumbled or reduced to powder.
Insulating Glass
Two sheets of glass with an air space between, to insulated against the passage of heat or sound. Also called double glazing.
rabbet
A groove cut into a member to receive another member.
wood
The hard fibrous substance lying beneath the pith and bark of a tree.
valley
The interior trough formed by the intersection of two sloping roof surfaces.
glazing
The work of installing glass in a frame.
Sealant
Material used to prevent the passage of liquid across a joint or opening.
Preservative
A substance that inhibits the development and action of fungi, borers and insects that deteriorate wood.
Hight-carbon Steel
Steel having carbon content over 0.5%. In general, increased carbon content increases strength and hardness but decreases ductility.
ASTM
American Society for Testing and Methods
Bulletproof glass
Glass which has four or more layers of glass laminated to three or more layers of plastic, used where strong impacts may occur.
Asphalt saturated felt
A roofing material applied in several layers to create a built-up composition roof.
Stile
The upright or vertical edge of a door or window.
Built-up roofing
Roofing made up of plies of saturated roofing felts alternated with layers of pitch or hot asphalt cement and surfaced with gravel or a cap sheet.
Weep hole
A small hole near the bottom of a retaining wall, usually backfilled with gravel, to allow water to drain the outside and thus avoiding hydrostatic pressure.
Unified Soil Classification System
The most widely used system for classifying soils. In this system, the soils are primarily classified as coarse-grained (grave & sand), fine-grained (silts and clays) and highly organic.
Plunger
The driving device of a hydraulic elevator. which is powered by liquid under pressure within a cylinder. Also called a ram.
Sill
The lower horizontal member, extending between jambs, which forms the bottom of a window or other frame.
hydraulic elevator
An elevator operated by fluid pressure from below, which raises or lowers the elevator car.
Baluster
A vertical support for a handrail.
Bullnose
A rounded exposed edge
Malleability
The ease with which metal can be shaped by hammering or by machine.
pith
The heart center of a log.
California bearing ratio (CBR)
A ratio used to determine the bearing capacity of a soil, based on a standard test.