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CEILING FRAMES. Created by Michael Martin March 2004 / Revised Feb 2007. Reference General Construction Knowledge Section 7 – Construct Ceiling Frames (from P278) The ceiling frame is the horizontal area between the top of walls and the roof

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ceiling frames
CEILING FRAMES

Created by Michael Martin March 2004 / Revised Feb 2007

slide3
Reference General Construction Knowledge Section 7 – Construct Ceiling Frames (from P278)
  • The ceiling frame is the horizontal area between the top of walls and the roof
  • Consists of ceiling joists,trimmers, hanging beams and counter beams
ceiling joists p279
CEILING JOISTS – P279
  • Joists carry the ceiling sheets and provide a lateral tie between base of opposing rafters
ceiling trimmers p279 80
CEILING TRIMMERS – P279-80
  • Sometimes called trimming joists, short lengths at right angles between ceiling joists. Give fixing to ends of ceiling sheets and can provide fixing for internal walls.
hanging beams p280 81
HANGING BEAMS – P280,81
  • These provide support to the ceiling joists mid-span, must be blocked at ends and if large sections may need to be strapped
slide7

Trimmers

Ceiling Joists

Hanging beam

support to joists p280
SUPPORT TO JOISTS – P280
  • There are three common types of support between ceiling joists and hanging beams, joist straps, triple grips and ceiling dogs
slide9

Remember:

Hanging beams go above the joists, so we have to block the ends. see page 281

cutting hanging beams p281
CUTTING HANGING BEAMS P281
  • Where hanging beams run across ceiling joists with end protruding past the rafter line as in a hipped roof, they must be cut but also supported via a trimmer
counter beams p282
COUNTER BEAMS – P282
  • Counter beams run at 90deg. To the hanging beam and supports it when it’s length exceeds it’s allowable span, ends of counter beams are packed slightly to allow for deflection.
set out erection of frame from p283
SET OUT & ERECTION OF FRAME – from P283
  • GABLE ROOF
  • the set out of the ceiling frame is based on the set out of the rafters
  • First check top plates for straight & square
  • Mark position of gable end rafters
  • Then work from one end, set out position of common rafters, other side of line becomes joists
  • See sketch
slide14
Next cut all ceiling joists to length and fix into position, double skew nail
  • Cut and fix ceiling trimmers to ends
  • Cut and fix trimmers above internal walls where required
slide15
Lastly fit hanging beams to the centre of the ceiling joists length over each room as required
  • Remember fixing and blocking for hangers
review on worksheet
REVIEW ON WORKSHEET
  • Review this part of your text book
  • In your own words answer the questions on your worksheet
review answers to work sheet
REVIEW ANSWERS TO WORK SHEET

Purpose of frame….

Designed to enclose the room, keep it free

from dust and it also provides insulation and

Security

Function of ceiling joists…

The horizontal member that carries the load of

the ceiling sheets and act as a tie between the

rafters at their base

slide18
Function of trimmers….

To provide fixing for ends of ceiling sheets,

also internal walls where they fall between

joists and help give lateral stability to frame

Function & position of hanging beams….

To support ceiling joists mid-span, must be supported on load bearing walls & blocked at ends

slide19
Fixing to hanging beams by….

Joist strap, triple grip, or ceiling dog and

should be fixed alternate sides at every second

joist

Hanging beams at external wall ….

Trim hanging beam to pitch of rafter

Function of counter beams….

Run 90 deg. to hanging beam and provides

support to them where they exceed their own

span

slide20
Set out and erection…
  • Check top plates are straight and square
  • Mark gable end rafters at each end
  • From one end set out common rafters marking each side of line for (r) rafter and (j) joist
  • Cut joists to length and fix into position, double skew nail
  • Fix trimmers to ends and where required for internal walls
  • Fix hanging beams to the centre of joists length in rooms required
  • Provide strapping where required