Power Point Presentation Unit 55 Roof Finish Roof

Power. Point® Presentation Unit 55 Roof Finish Roof Overhangs and Cornices • Open Cornices • Closed Cornices • Cornice Soffit Systems • Covering Roofs • Asphalt Shingles • Wood Shingles and Shakes • Tile Roofing • Metal Roof Covering • Built up Roof Covering

Unit 55 — Roof Finish fascia boards are nailed to a fascia backer or directly to the roof rafter tails.

Unit 55 — Roof Finish In open cornice construction, the frieze board is cut between the rafters and molding is nailed over the frieze board.

Unit 55 — Roof Finish For a flat box cornice with a plywood soffit, the soffit is nailed to the upper edge of the frieze board and to the underside of the lookouts. Note the metal soffit vent installed in the soffit for ventilation.

Unit 55 — Roof Finish Lookouts are not required for a sloped box cornice. The soffit is nailed directly to the underside of the rafters. Note the soffit angle when compared to the flat box cornice shown in Figure 55 3.

Unit 55 — Roof Finish A flat box cornice requires a cornice return at the corner intersection of the gable end overhang and eaves soffits.

Unit 55 — Roof Finish A sloped box cornice does not require a cornice return at the gable end overhang.

Unit 55 — Roof Finish Vinyl cornice soffits and trim finish the overhang of this building. Note the vent openings in the soffit panels of the upper level.

Unit 55 — Roof Finish Gutters and downspouts drain water from a roof.

Unit 55 — Roof Finish Shingles and shakes must be properly lapped to ensure the roof is watertight.

Unit 55 — Roof Finish In cold climates, eaves flashing is installed along the roof eaves and extends 12″ to 24″ inside the building wall line.

Unit 55 — Roof Finish The adhesive ice and water guard membrane is applied directly to the roof sheathing.

Unit 55 — Roof Finish A 2″ toplap and 4″ sidelap are required for shingle underlayment.

Unit 55 — Roof Finish Asphalt strip shingles are available in many designs. Seal down adhesive tabs help to prevent wind damage to the shingles.

Unit 55 — Roof Finish Individual asphalt shingles are primarily used for restoration work.

Unit 55 — Roof Finish Open valley or closed valley flashing may be used on asphalt‑shingled roofs.

Unit 55 — Roof Finish Metal stepped flashing is necessary where a joint occurs between a pitched roof and vertical wall.

Unit 55 — Roof Finish Flashing is required where stacks project above the roof.

Unit 55 — Roof Finish Smooth, annular, or screw shank nails are used to fasten asphalt shingles to roof sheathing.

Unit 55 — Roof Finish Drip edges, underlayment, and eaves flashing must be installed prior to installing asphalt strip shingles. In this example, three‑tab strip shingles are used.

Unit 55 — Roof Finish The Boston method may be used for finishing the ridge and hips of an asphalt shingle roof.

Unit 55 — Roof Finish Shingles have a smoother finish than shakes and are tapered from the butt to the concealed end.

Unit 55 — Roof Finish Spaced sheathing is commonly used with wood shake or shingle roofs to provide air circulation beneath the roof. Note that solid sheathing is installed over the eaves.

Unit 55 — Roof Finish When nailing shingles or shakes, drive the nails until heads rest on the surface. If nails are driven into the surface, they will have less holding power. Use only two nails to a shake, placed 3/4″ from each edge and 1 1/2″ above the exposure line. Hot‑dipped, zinc‑coated nails are recommended when applying wood shingles. Aluminum and stainless steel nails are also acceptable.

Unit 55 — Roof Finish Greater shingle exposure is allowed for roofs with steeper slopes.

Unit 55 — Roof Finish The first course of wood shingles should extend 1″ to 1 1/2″ beyond the eaves and 1″ beyond the rake edge of the gable.

Unit 55 — Roof Finish Since wood shakes have rough and uneven surfaces, underlayment must be placed between each course.

Unit 55 — Roof Finish Hip sections of a roof are finished off with a hip cap.

Unit 55 — Roof Finish When finishing a hip roof, shingles may be overlapped at the hip and flashing is installed in valleys.

Unit 55 — Roof Finish Ridge and hip caps are also available as factory‑manufactured units.

Unit 55 — Roof Finish The open valley method is considered the most practical for finishing a valley.

Unit 55 — Roof Finish Flashing and counter flashing must be placed around a chimney on a wood shake roof.

Unit 55 — Roof Finish Tile roofing provides an attractive and fireproof finish roof covering.

Unit 55 — Roof Finish Tile roofing is available in a variety of field tiles and accessories.

Unit 55 — Roof Finish Battens are laid out to provide proper headlap for tiles.

Unit 55 — Roof Finish Metal flashing is placed in all roof areas where leaks may occur.

Unit 55 — Roof Finish Metal shingles are textured to provide the appearance of wood shakes or shingles.

Unit 55 — Roof Finish Battens may be installed beneath metal shingle panels.

Unit 55 — Roof Finish Standing seam metal roofs provide excellent water drainage.

Unit 55 — Roof Finish Standing seam roll formed panels are secured in place with clips concealed inside the seams. A factory applied sealant inside the seam produces a watertight connection when the seams are properly installed.

Unit 55 — Roof Finish When applying a built‑up roof, each felt layer is hot‑mopped. The final surface is covered with gravel embedded in asphalt or tar.

Unit 55 — Roof Finish Built up roof coverings are commonly used with flat roof decks constructed with parapets. Flashing, counterflashing, and asphalt saturated felt are installed around the edges of the roof deck and other roof projections to provide a watertight seal.

Unit 55 — Roof Finish Gravel stops are used to finish the edges of built‑up roofs.