Is nogging really necessary for studs?
Is nogging really necessary for studs?
(OP)
Timber studs in Australia (& many countries ofthe world) are required to have nogging (dwangs) between studs at about 4'6" (1.35m) centres vertically. Their function is often debated. Is it needed to stiffen the wall against a concentrated load, to fix the wall lining, to prevent the studs from twisting or to provide restraint against buckling in the stud's weak direction when it is in compression?
If a loadbearing stud wall is lined both sides does it need to be nogged? Does it depend on the lining material?
If it is lined on one side (as in brick veneer construction) does it need to be nogged?
If the noggings could be eliminated or reduced then that would facilitate services installation and speed up construction but lining would have to be added before heavy weight roofs are installed.
If a loadbearing stud wall is lined both sides does it need to be nogged? Does it depend on the lining material?
If it is lined on one side (as in brick veneer construction) does it need to be nogged?
If the noggings could be eliminated or reduced then that would facilitate services installation and speed up construction but lining would have to be added before heavy weight roofs are installed.





RE: Is nogging really necessary for studs?
RE: Is nogging really necessary for studs?
Shear transfer for sheathing, stability for wood studs, and nailing surfaces. The external sheathing, and internal wall covering typically provide adequate stud support. For walls 10 ft and greater we block at 4' OC min. tto prevent twisting of the studs.
Cheers
RE: Is nogging really necessary for studs?
In the US, the code we use, the National Design Specification, gives some guidelines on the use of blocking or sheathing material for stud stability. Basically there are some assumptions and requirements that have to be met to ensure stability is provided and so on. As boo1 mentions, blocking may also be used for the shearwall sheathing to increase shear capacity.
Typically we use blocking as standard and then it doesn't matter what the sheathing details are (for stud design) plus there are often code requirements for blocking to provide a fire stop. If it has to be there anyway you may as well use it.
RE: Is nogging really necessary for studs?
In North America are your external walls always sheathed with a structural sheeting? In Australia many houses are clad with a single skin of bricks and attached with metal ties at 2' centres (centers)to the stud frame - called brick veneer. There is usually only an aluminium paper on the outside of the studs and sometimes with a non-rigid insulating batt (blanket). So there is no structural restraint to the outside of the studs as you would get from plywood, OSB or the like.
Fire control has not been an issue in detached (houses spaced some 10' apart) house construction.
Do you have a similar construction method to brick veneer in the USA?
RE: Is nogging really necessary for studs?
In Florida where I'm from, we have fairly high wind loading and therefore the wall studs we design have to be braced well for moment capacity, so we're used to seeing nogging (I learned something