Page 123 - directory final 2014/2015

Electrical Contractors

DOUBLE TEE - Refers usually to a precast roof deck panel poured with two fins in its underside to impart flexural rigidity.

DOW CORNING – Leading manufacturer of silicone building sealants and exterior, decorative, waterproof wall coatings.

Dow Corning “795” is approved for full contact with glass in wet sealing/wet glazing applications on glass curtain walls,

windows, and skylights. “795” is an excellent product for every exterior wall joint sealant application.

DOWNSPOUT - The metal pipe used to drain water from a roof.

DRAWING OUTLINE - A top view drawing of a building or roof showing only the perimeter drawn to scale.

DRAWING DETAIL - A top view drawing of a building or roof showing the roof perimeter and indicating the projections

and roof mounted equipment, drawn to scale.

DRIP EDGE - A device, usually a sheet metal strip fastened to the wall above window and door openings, designed to pre-

vent water from running back or under an overhang. Drip edge can also be a reveal cast or cut into the surface of masonry or

concrete wall panels above window and door openings.

DRIPPAGE - Bitumen material that drips through roof deck joints, or over the edge of a roof deck.

“DROPPING” A STRINGER – In carpentry, means cutting short on the bottom of a stairs, to allow for thickness of the first

tread.
122 DRY GLAZING – Also called compression glazing, a term used to describe various means of sealing monolithic and insulat-

ing glass in the supporting framing system with synthetic rubber and other elastomeric gasket materials.

DRY IN - To make a building waterproof.

DRY SEAL – Accomplishment of weather seal between glass and sash by use of strips or gaskets of Neoprene, EPDM, sili-

cone or other flexible material. A dry seal may not be completely watertight.

See page 124

Chamber of Construction Industry Sri Lanka Product & Material Suppliers