How to Plasterboard a Loft

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How to Plasterboard a Loft

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Applying plasterboard (drywall) to a loft falls in difficulty somwehere between working on walls and ceilings. This is because loft walls are for the most part installed at an angled pitch. If there are any vertical walls in the loft area, 1/2-inch width drywall is used, and for ceilings or angled walls, 5/8-inch width drywall is the norm. Wall drywall is attached with 1 5/8-inch drywall nails, and ceiling/angled wall drywall is attached with 1 5/8-inch drywall screws. Once installed, all drywall joints are covered with mesh tape and drywall compound, to seal the room.


Step One

Place drywall scaffolding close to the first area where the first piece of drywall will be installed (scaffolding can be purchased or rented). Hold the first piece of drywall against the pitched area of the loft. Start at one end of one side of the loft. Using a screw gun, attach the drywall to the ceiling joists with drywall screws, 8 inches apart.


Step Two

Measure, mark and cut the next piece of drywall using a chalk line to create longer lines on the drywall. To cut the drywall, run a tradesman's knife all the way along the marked line. Bend the drywall on the other side of the drywall to the line--the drywall will break along the line. Run the tradesman's knife all the way along the inside of the break, and the drywall will be separated.


Step Three

Move the scaffolding along to the area where the next piece of drywall needs to be installed. As before, measure, mark and cut the drywall as needed. Work your way along all pitched areas of the loft before moving on to any vertical wall areas (remember to use drywall nails to install the walls).


Step Four

Apply drywall mesh tape to all drywall joints. Run the strip of tape along the joint, sticky side down, making sure that half the width of the tape is on each side of the joint. For drywall joints that stick out into the room (such as the corner of a built-in closet), apply corner beading over the length of the joint and attach it to the drywall with drywall nails.


Step Five

Pour some drywall compound into a drywall tray. Using a 6-inch drywall knife, apply a layer of compound over all mesh tape areas, corner beading and screw/nail heads. Feather out the compound when covering the tape by smearing compound onto the wall past the edge of the tape, decreasing the thickness of the compound as you go. Wait for the compound to fully dry--usually 24 hours.


Step Six

Sand all dried compound to free it of any ridges or bumps. Start with medium, then fine sandpaper. If any screw/nail heads or tape can be seen, apply a second layer of compound to these areas. After it dries, sand it again.


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