HOW TO BUILD A WALL 6

NEXT....After you have applied the wallboard of the ceiling and all the walls, you are ready to proceed with "welding" and concealing all the joint and treating the nail heads. As the first step in joint treatment,use a 5" wallboard putty knife to better adhesive into the channel formed by the tapered edges of the board. The adhesive, recommended by the gypsum-wallboard manufacturer, should be mixed to a putty-like consistency. Apply moderate pressure, filling the channel evenly.Then lay the special reinforcing tape neatly into the adhesive, centering it over the joint. With the knife, press the tape firmly into the adhesive ,removing all air pockets and excess cement. Next, cover the tape with a thin coating of adhesive. When the first coat of adhesive has dried, remove any remaining roughness by sanding the surface lightly and then apply a second coat, feathering it out on both sides of the recess, leaving it too as smooth as possible. After the second coat is dry, again remove any  roughness by sanding and then apply a final smoothing coat of adhesive, feathering it out beyond the second coat. If any rough spots remain after the adhesive has thoroughly dried, sand very lightly with fine sandpaper. Nail heads are concealed with the same adhesive used to teat the joints. They should be spotted with adhesive the same time that each of the three coats is applied to the joints. If the nail heads are not completely covered with the first layer of adhesive, they should immediately be driven further into the dimple with a crown-headed hammer.

APPLYING GYPSUM WALLBOARD

1. Apply long side at right angle to framing. Support in assistant's hand hold up ceiling board during nailing.
2. Assistant starts to support the ceiling board as it is carefully edged into place.
3. First nail driven into center of sheet; then nail outward to opposite edge.
4. Left hand holds board against joists while nailing. Nails always "dimple" the surface.
5. No saw is needed.Score both faces of the board with a hooked knife and snap off.
6. Scrap pieces can be used in small areas like the section around a window show above.
7. Board is punctured with saw tip, then cut to provide opening for recessed light fixture.
8. Board knife is used to spread joint cement. It is first step in joint-concealment procedure.
9. Reinforcing tape is applied over cement to entire length of joint and pressed into place.
10. After excess cement is removed, wait a day. Apply second coat wider then first.
11. Fine sandpaper, used with minimum of pressure, helps smooth the surface.