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Gutter, Soffit and Fascia Terms

Apron Flashing
A horizontal flashing installed where the top end of a roof slope meets a vertical projection, such as a chimney or parapet wall.


Barge
A finishing at the gable end of a roof, fixed parallel to the roof slope.

BMT
Base metal thickness.

Box Gutter
A gutter not at an eave, typically at the base of two opposing roof slopes.

Bid
A formal offer by a contractor, in accordance with specifications for a project, to do all or a phase of the work at a certain price in accordance with the terms and conditions stated in the offer.

Brick mold
Trim used around an exterior doorjamb that siding butts to.

Built-up roof
A roofing composed of three to five layers of asphalt felt laminated with coal tar, pitch, or asphalt. The top is finished with crushed slag or gravel. Generally used on flat or low-pitched roofs.


Cap flashing
The portion of the flashing attached to a vertical surface to prevent water from migrating behind the base flashing.

Capping
A cover at the top of a gap that weatherproofs, typically at the ridge of a pitched roof.

Chimney Gutter
See Soaker.

Cladding
Sheeting that encloses a building-roofing and walling.

Counter (or over) Flashing
A flashing dressed down as a cover only, over a separate upstand.


Downpipe
A pipe to carry roof water from gutters and roof catchments to drains or storage tanks.

Drainage
A system of gutters and drainpipes that carry water away from the foundation of a house.

Drop
See Pop.

Drop Outlet
Formed piece that serves as the hole from which the water travels from the horizontal section of the gutter to the downspout.


Eaves Gutter
A roof gutter attached at an eaves overhang.

Elbow
Pre-finished angled piece for directing water flow.

Electrolytic (galvanic) Corrosion
Corrosion resulting from the contact of two different metals when an electrolyte (like water) is present.

End Cap
Flat formed piece that is placed at the end of a gutter section.

Expansion Joint
A joint in a long run of cladding, gutter or flashing designed to allow for thermal expansion and contraction.


Fall (slope)
The slope of the roof or gutter, often expressed in degrees, or as a ratio of vertical height to horizontal distance (e.g. 1 in 20).

Fascia (fascia board)
A flat board that runs horizontally along the eaves of a roof, typically capping the ends of the roof rafters to give the roof edge a more finished look and provide a base for attaching gutters.

Fixings Screws
Nails or clouts used to fasten cladding to a building structure.

Flashing
A material, usually metal, used to waterproof the junction between two intersecting roofs and/or wall surfaces. At a masonry wall, it is often built into the mortar.


Galvanized Steel
Steel sheeting protected against corrosion by a zinc coating applied by the continuous hot-dip process.

Girth
The width of the blank strip from which a profile is rolled (usually refers to gutters and flashings).

Gutter
Horizontal channels installed at the edge of a roof to carry rainwater or melted snow away from the house.


Hanger
Flat strap that is installed under the roofing matierial that holds up the horizontal section of the gutter.

Hanging Flashing
Side, front, or back cover piece used to prevent entry of water between abutting surfaces and other gutters, flashings and soakers.


Inside mitre box
A corner piece of the horizontal section that is deflected in.


Leader
A pipe that carries rainwater from the gutters to the ground, sewers, or wells.


Mansard
A roof built at two pitches, the steeper pitch commencing at the eaves and the flatter pitch finishing at the ridge.


Nozzle
See Pop.


Offset
A pipe fitting that directs a downpipe from the gutter, under the eaves soffit and down a wall.

Oilcanning
Variation from flatness of sheet metal, creating undulations along the surface. The result is poor appearance and potential ponding.

Outside mitre box
A corner piece of the horizontal section that is deflected out.


Pan
The flat portion between the ribs in a pan-type preformed sheet.

Parapet
A wall on the perimeter of a building that projects above the line of the eaves.

Penetration
A projection through the roof, e.g. vent pipe, chimney or rooflight.

Pierce-fastened
A method of fixing cladding by means of a screw or nail which pierces the cladding.

Pitch
The angle at which a horizontal section of gutter is tilted in order to force water to flow toward a downspout.

Ponding
Pooling of undrained water on a roof.

Pop
A short fitting in a gutter sole, where rainwater leaves the gutter.


Rainhead
A box-shaped receptacle sometimes used between gutters and downpipes to provide an external overflow point.

R-value
A value given for the resistance to heat transfer of a roof or wall system.

Rib
A longitudinal upstand in cladding.

Ridge Capping
Formed metal designed to weatherproof the junction at the apex of opposing roof slopes.

Run
Length of a horizontal section of gutter.


Saddle Strap
See Straps.

Sarking
A membrane to collect and discharge clear of the structure any water that may penetrate a roof or wall cladding.

Shoe
A fitting used in a downpipe, to change direction of the downpipe by about 45 degrees.

Soaker (gutter)
A small gutter located on the upper side of a chimneystack.

Soaker (flashings)
A side cover piece extended over a roof cover and overflashed with a hanging flashing. Formed metal designed to weatherproof the perimeter of roof protrusions or penetrations. Soaker flashings are usually positioned under rather than over the surrounding metal roof.

Sole
The internal, bottom surface of a roof gutter.

Splashblock
Plastic or concrete surface put under a downspout to direct water away from the house.

Spreader
A downpipe-tee or elbow fixed at 90 degrees to the roof slope used to spread stormwater over a greater area of the roof.

Spouting
See Gutter.

Strap
Flat hangers that are nailed into the house to hold the downspouts in place.

Sump
A roof gutter pit used to connect downpipes to internal roof gutters.


Thermal Stress
Stress due to expansion and contraction caused by changes in temperature.

Trays
See Pan.


Valley Gutter
A gutter at the bottom intersection of two sloping roofs (also called a valley flashing).

Valley Boards
Timber or profiled metal laid under a valley gutter to support it.


Zincalume
Steel sheeting protected against corrosion by an aluminium-zinc coating.