ARCH 3007 Exam 3 - Roofing

Ceiling joist

Horizontal member spanning from wall to wall

Resists outward thrust from rafters

Holds up ceiling

Rafter

Joist like framing member that runs at a slope

Ridge Board/beam

Board against which ends of rafters are fastened.

Knee wall

short wall under the slope of a roof

Pitch

slope of a roof or plane, expressed in inches of rise per 12” of run

Low slope

Can cause problems with water drainage

High slope

can be difficult and dangerous to install or repair

Valley

trough formed by the intersection of 2 roof slopes

Hip

Diagonal ridge formed by the intersection of 2 roof slopes

Jack rafters

Common rafter cut to meet diagonal of valley or hip rafter

Eave

Lower/outer end of roof projecting beyond the exterior wall (8”-2”)

Fascia

Vertical face of eave

Soffit

Underside of eave

Soffit vent

Screened opening to allow air to enter ti ventilate attic

Gable vent

On gable end for venting hot air

Ridge vent

A long ridge for venting hot air

Attic vent

Exhausts air brought in thru soffit vents

Types of concrete roof tiles

Curved, Spanish, flat interlocking, flat shingles

How were curved concrete tiles made?

Use to be made by curving around peoples thighs

Wood shakes - split

Wood shingles - cut

Metals that withstand rust and wear

Corrugated, galvanized steel, aluminum, copper, zinc

Non structural metal roof needs….

A deck or sheathing to attach to

Structural metal roof spans between…..

Beams or purlins

Flat roof assembly

Aren’t actually flat

Minimum slope is ¼” per ft

Rain goes to internal drains or exterior scuppers

Ponding

Accumulation of water on roof and can lead to catastrophic failure

Parapet

Low protective wall along the edge of a roof, bridge, balcony

Built up roof (BUR)

Ply sheets asphalted together

Modified Bitumen

Asphalt on a rubber membrane

Attached with glue too

TPO

Thermoplastic polyolefin

Single thing rubber sheets

Mechanically attached or glued down

Seams “welded” together

Froe

Adze

Draw knife