Deck – The surface installed over the supporting framing members to which the roofing is applied.
Dormer – A framed window unit projecting through the sloping plane of a roof.
Double coverage – Application of asphalt roofing such that the lapped portion is at least two inches wider than the exposed portion, resulting in two layers of roofing material over the deck.
Downspout – A pipe for draining water from roof gutters. Also called a leader
Drip edge – A non-corrosive, non-staining material used along the eaves and rakes to allow water run-off to drip clear of underlying construction.
Dutch lap method – Application of giant individual shingles with the long dimension parallel to the eaves. Shingles are applied to overlap adjacent shingles in each course as well as the course below.
DAMPER – Valve for controlling airflow. When ordering registers, make sure each supply outlet has a damper so the air flow can be adjusted and turned off. Dampers maybe either manually or automatically operated. Automatic dampers are required for exhaust air ducts.
DAMPPROOFING – A process used on concrete, masonry or stone surfaces to repel water, the main purpose of which is to prevent the coated surface from absorbing rain water while still permitting moisture vapor to escape from the structure. (Moisture vapor readily penetrates coatings of this type.) "Dampproofing" generally applies to surfaces above grade; "waterproofing" generally applies to surfaces below grade.
DARBY – A flat tool used to smooth concrete flatwork immediately after screeding. See Bullfloating
DEAD LOAD – The constant, design-weight (of the roof) and any permanent fixtures attached above or below.
DECK - An elevated platform. "Deck" is also commonly used to refer to the above-ground floors in multi-level parking garage.
DEFLECT – To bend or deform under weight.
DEFLECTION – The amount of bending movement of any part of a structural member perpendicular to the axis of the member under an applied load.
DESIGN PRESSURE – Specified pressure a product is designed to withstand.
DEW POINT – The critical temperature at which vapor condenses from the atmosphere and forms water.
DISTORTION – Alteration of viewed images caused by variations in glass flatness or inhomogeneous portions within the glass. An inherent characteristic of heat-treated glass.
DORMER – The house-like structure which projects from a sloping roof.
DOUBLE-GLAZING – In general, any use of two lites of glass, separated by an air space, within an opening, to improve insulation against heat transfer and/or sound transmission. In insulating glass units the air between the glass sheets is thoroughly dried and the space is sealed, eliminating possible condensation and providing superior insulating properties.
DOUBLE PLATE – when two layers of 2 x 4's are placed on top of studs in framing a wall.
DOUBLE STRENGTH – In float glass, approximately 1/8" (3 mm.) thick.
DOUBLE TEE - Refers usually to a precast roof deck panel poured with two fins in its underside to impart flexural rigidity.
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 designed to prevent water from running back or under an overhang.
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.
DRY GLAZING – Also called compression glazing, a term used to describe various means of sealing monolithic and insulating 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, silicone or other flexible material. A dry seal may not be completely watertight.
DRY SHEET – A ply mechanically attached to wood or gypsum decks to prevent asphalt or pitch from penetrating the deck and leaking into the building below.
DRYWALL - Sheetrock (gypsum board) that covers the framing and taping, coating, and finishing to make the interior walls and ceilings of a building. Drywall is also used as a verb to refer to installation process.
DRYWALL HAMMER – A special hammer used for nailing up gypsum board. It is also known as an ax or hatchet. Edges should be smooth and the corners rounded off. The head has a convex round & checkered head.
DRYWALL NAIL – Nails used for hanging regular drywall that is to be taped and finished later must have adequate holding power and a head design that does not cut the face paper. They must also be of the proper depth to provide exactly 1 inch penetration into the framing member. Nails commonly used are chemically-etched and are designed with a cupped head.
DUCT – A cylindrical or rectangular "tube" used to move air either from exhaust or intake. The installation is referred to as "duct work".
DUMBWAITER – An elevator with a maximum footage of not more than 9 sq. ft. floor area; not more than 4" headroom and a maximum capacity of 500 lbs. used for carrying materials only.
DUROMETER – The measurement of hardness of a material. A gauge to measure the hardness of an elastomeric material.
DAVE – The name of the guy who compiled this glossary. I'm glad you are actually reading this.
DAMPPROOFING – A process used on concrete, masonry or stone surfaces for the purpose of repelling
water. Moisture vapor readily penetrates coatings of this type. The main purpose
of dampproofing is to prevent the coated surface from absorbing rain water while
allowing is to breathe moisture vapor out of the structure.
DEAD LOAD – The constant designed weight (of the roof) and any permanent fixtures attached
above or below.
DECK – The base surface to which a roof system is applied.
DEFLECT – To bend or deform under weight.
DEW POINT – The critical temperature at which vapor condenses from the atmosphere and forms
water.
DORMER – The house-like structure which projects from a sloping roof.
DOUBLE TEE – Refers usually to a precast roof deck panel poured with two fins in its underside to
impart flexural rigidity.
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 designed to prevent water from running back or under an overhang.
DRIPPAGE – Bitumen material that drips through roof deck joints, or over the edge of a roof deck.
DRY LAP – A term describing the absence of bitumen between the plies of felt at the overlap
in a BURM.
DRY SHEET – A ply mechanically attached to wood or gypsum decks to prevent asphalt or pitch
from penetrating the deck and leaking into the building below.
DUCT – A cylindrical or rectangular "tube" used to move air either from exhaust or intake. The installation is referred to as "duct work". |
