![]() ![]() And if you’re drywalling over plaster in the bathroom. You may also see plaster that seeped out between the laths we call them keys. You will see layers of plaster with no paper in sight. On the left, this is what the cross-section of a plaster wall looks like. Just remember to go with thin drywall so you don’t have to move your electrical boxes. Remove a switch plate or electric socket so you can take a peek and check the cross-section of the wall. Drywall is generally easier to install and cheaper to repair. Doing this will save you a lot of time and money. But the depth you create will obviously depend on the depth of the battens plus the plasterboard thickness. Yes, you can drywall over plaster as long as your plaster is in decent shape. Many electricians use grounding screws in both the box and the bracket, but one ground is sufficient. All metal boxes and brackets must be grounded to be safe. ![]() The bracket is attached to the box and the fixture is screwed to the mounting bracket. If you use battens on the wall instead of adhesive it just means you can screw the plasterboard on to the battens instead of using adhesive. In this basic setup, the ceiling box mounts to an adjustable bar, which is screwed to ceiling joists. That will increase the depth to around 37mm. If you use insulated plaster board, like 25mm thick, you still need to use adhesive to glue it on to the bare wall. You fix the boxes and wiring before you put the plasterboard on the wall. To patch the area, start by trimming away any loose paper or drywall. If the box is left in place, make sure there are no electrical wires inside (live electrical wires should be covered with a blank cover plate, not with drywall). So the gap being 12.5mm plus the plasterboard being 12.5mm leaves a nice 25mm deep recess.If you intend on using deeper back boxes such as 35mm or 47mm then chase out extra depth in the wall where you intend fixing the box and leave it 25mm proud. A drywall router is a powerful toolbe careful not to apply too much pressure or you risk cutting into the electrical box or framing. When an electrical outlet is eliminated, the box may be removed or left in the wall. Weatherproof metal boxes for outdoor use are generally made of aluminum. Its usual to fix 25mm deep back boxes directly to the bare brick/block and then 'glue' the plasterboard in position around them having cut a rectangle out of the plasterboard to leave it flush with the plasterboard surface. Best for: Metal-sheathed cable or metal conduit (metal boxes), Romex or non-metallic cables (plastic boxes) Most electrical boxes are either metal or plastic: Metal boxes are generally made of steel, while plastic boxes are either PVC or fiberglass. ![]() If you use what is known in the trade as 'dot-and-dab' plaster boarding you automatically create a 12.5mm gap behind the plasterboard with the plasterboard adhesive (dots and dabs). ![]()
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