PowerPoint ® Presentation Unit 44 Ceiling Framing Ceiling Joists Laying Out Ceiling Frames...

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Unit 44Unit 44Ceiling FramingCeiling Framing

Ceiling Joists • Laying Out Ceiling Frames • Constructing Ceiling

Frames • Attic Scuttles • Constructing Flat Roof Ceilings

Ceiling Joists • Laying Out Ceiling Frames • Constructing Ceiling

Frames • Attic Scuttles • Constructing Flat Roof Ceilings

Unit 44 — Ceiling FramingUnit 44 — Ceiling Framing

A ceiling frame ties together the exterior walls and resists the outward pressure of roof rafters.A ceiling frame ties together the exterior walls and resists the outward pressure of roof rafters.


Ceiling joist size is based on the amount of weight the joist must carry and the joist span. For example, No. 1 2 × 6 Douglas fir joists spaced 24″ OC can span up to 14′-5″.

Ceiling joist size is based on the amount of weight the joist must carry and the joist span. For example, No. 1 2 × 6 Douglas fir joists spaced 24″ OC can span up to 14′-5″.


When ceiling joists butt over a partition, an 18 ga 18 long metal strap can be used to tie the joists together.

When ceiling joists butt over a partition, an 18 ga 18 long metal strap can be used to tie the joists together.


Whenever possible, ceiling joists should be nailed to rafters.

Whenever possible, ceiling joists should be nailed to rafters.


When ceiling joists do not run parallel to the roof rafters, 2 × 4s can be used as a tie between exterior walls.When ceiling joists do not run parallel to the roof rafters, 2 × 4s can be used as a tie between exterior walls.


Stub joists may be required where rafters do not run parallel to ceiling joists.

Stub joists may be required where rafters do not run parallel to ceiling joists.


A 1 × 4 ribband nailed at the center of the joist spans prevents twisting and bowing of the joists.A 1 × 4 ribband nailed at the center of the joist spans prevents twisting and bowing of the joists.


A strongback provides central support for the joist span.A strongback provides central support for the joist span.


When studs and ceiling joists are spaced 16 OC, the joists rest directly over the studs. When studs are spaced 16 OC and ceiling joists are spaced 24 OC, every other joist will align with the studs below.

When studs and ceiling joists are spaced 16 OC, the joists rest directly over the studs. When studs are spaced 16 OC and ceiling joists are spaced 24 OC, every other joist will align with the studs below.


A ceiling frame is constructed over walls that have been straightened and properly braced. In this example, joists lap over an interior bearing partition.

A ceiling frame is constructed over walls that have been straightened and properly braced. In this example, joists lap over an interior bearing partition.


A ledger board is nailed against the wall to provide a nailing surface for lower ceiling joists.

A ledger board is nailed against the wall to provide a nailing surface for lower ceiling joists.


Backing is nailed to the top plates to provide a nailing surface for the edges of the finish ceiling material. Backing may be 2 × 6s or 2 × 8s.

Backing is nailed to the top plates to provide a nailing surface for the edges of the finish ceiling material. Backing may be 2 × 6s or 2 × 8s.


Backing is sometimes nailed on top of bearing partitions.

Backing is sometimes nailed on top of bearing partitions.


Blocks and backing are installed between joists to secure tops of walls running parallel to ceiling joists.

Blocks and backing are installed between joists to secure tops of walls running parallel to ceiling joists.


For flat roofs, rafters serve as a base for the roof and as ceiling joists. Since joists for a flat roof must support the combined load of the ceiling and roof materials, 2 × 10s or larger framing members are used.

For flat roofs, rafters serve as a base for the roof and as ceiling joists. Since joists for a flat roof must support the combined load of the ceiling and roof materials, 2 × 10s or larger framing members are used.


A flat roof must have a small amount of pitch for proper water drainage.

A flat roof must have a small amount of pitch for proper water drainage.


Parapets can be framed over top plates.

Parapets can be framed over top plates.


Parapets can be framed into exterior walls.

Parapets can be framed into exterior walls.

PowerPoint ® Presentation Unit 44 Ceiling Framing Ceiling Joists Laying Out Ceiling Frames...

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