Gypsum joints and holes speaks to what are gypsum joints and holes and why gypsum joints and holes.
These are considerations for finishing the joints and fastener holes when installing gypsum board.
Joints and holes in gypsum board are finished to create the appearance of a monolithic surface almost nonrecognized from plaster. The finishing process is based is on the use of a joint compound that resembles a smooth sticky plaster.
For most purposes, a drying type joint compound is used which is a mixture of marble dust, binders, admixtures, furnished either as a dry powder to be mixed with water or as a premixed paste. In some high production commercial work, setting compounds that cure rapidly by chemical reaction are used to minimize the waiting time between applications.
Joint compounds of different weights and strengths may be used for different stages of the joint finishing process, or a single all purpose compound may be used for all steps.
The finishing of a joint between panels of gypsum board begins with the troweling of a layer of joint compound into the tapered edge joint and the bedding of a paper or glass reinforcing tape in the compound. Compound is also troweled over the nail or screw holes. After drying, usually overnight, a second layer of compound is applied to the joint to bring it level with the face of the board and to fill the space left by the slight drying shrinkage of the joint compound.
When this second coat is dry, the joints are lightly sanded before a very thin final coat is applied to fill any remaining voids. The final coat is featured out, which means tapered down to zero, to create am invisible edge. Before painting, the wall is again sanded lightly to remove any roughness or ridges. If the finishing is done properly, the painted or papered wall will show no signs at all that it is made of discrete panels of material.
Gypsum board has a smooth surface finish, but a number of spray on textures and textured paints can be applied to give a rougher surface. Most gypsum board contractors prefer to texture ceilings, the texture conceals the minor irregularities in workmanship that are likely to occur because of the difficulty of working in the overhead position.