Roof Without Ceiling Joists

Someone with more knowledge please correct me if i m wrong.

Roof without ceiling joists.

So according to my calculations the 2x4 roof joists at 24 o c. The shape and size of a roof depends on the span and the floor. Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor. The first surface is unsurprisingly the ceiling the materials of which attach directly to the joists.

A gable roof consists of two upward sloping sides that slope at the same angle and from the end look like a symmetrical triangle. If this is the case with your structure use the floor joist table to determine maximum joist length load. First the existing 2x4 ceiling should not be able to span 12 and support the existing gypsum board without cracking due to extreme bending. Advertisement you make something idiot proof and the world invents a better idiot.

The following 2 users say thank you to golden view for this useful post. A structural ridge is the standard alternative to ceiling joists. Where ceiling joists are used to provide resistance to rafter thrust lapped joists shall be nailed together in accordance with table r802 5 1 9 in the irc. Ceiling joists provide support for more than one surface in your home.

If you build a square hip roof you can do it without ceiling joists. Joist span tables use these tables to determine lengths sizes and spacing of ceiling joists. In this design the tops of the rafters attach to a load bearing ridge beam that runs along the length of the roof. Gable roofs without ceiling joists provide a much higher and triangular shaped ceiling inside the home.

Nonparallel ceiling joist designs require additional support construction in the ceiling. For example if a house has a 4 12 slope the rafters are on 16 inch centers the snow load is 30 psf and the roof span is 28 feet you need eight 16d common nails or 40d box nails at. Second the 2x4 roof joists should not be able to span the 23 with just roof ties and you re even missing one.