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Prepping plaster on walls by Innes Donaldson





Prepping plaster on walls by
Article Posted: 03/30/2021
Article Views: 39
Articles Written: 1575
Word Count: 1323
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Prepping plaster on walls


 
Advice,Business,Consumer
Preparing Walls for Plaster

Installing rock lath, the base to which wall plaster is applied, is not a difficult job and requires only a few tools. If you can swing a hammer or cut wire with tin snips or read a carpenter's level, you can do your own lathing. For speed and convenience, invest in a lathing hatchet. If you prefer to use your own hammer, you'll have to score and cut the lath with a knife, which takes longer.

First calculate the square yardage on all surfaces to be covered and order lath accordingly. Buy metal corner stripping by the linear foot for openings and corners. Ten pounds of lathing nails will be needed for each 100 square yards of rock lath. The next step is to set up baseboard grounds - 3/4" wood strips which allow for some foundation settling and prevent plaster cracks. Nail these along all walls to be plastered. Then proceed as outlined in the photographs. Remember to keep all lathing work neat and the corners square. The final job will be just as good - or bad - as this essential base job.

How to Plaster a Wall

There's an art to making a good plaster wall, and the use of the proper tools is essential. These include a plasterer's trowel, a corner-shaping tool, a hawk, a darby, a screeding rod, a heavy brush and a bucket. To order the materials you will need, figure the square feet of the area to be covered. The undercoat is a mixture of sand, pre-pared gypsum plaster and water. You will need - for each 10 square feet of undercoat - 90 pounds of plasterer's sand, cleaned and screeded, and 30 pounds of gypsum plaster.

TOOLS

1. Trowel: a plasterer's trowel is a must. This has a long brace bar on the top side in contrast with the shorter bar on a mason's steel float. It costs several dollars more and is worth the price. 2. Hawk: this is the classic mortarboard device. Use one made of aluminum and save wear and tear on yourself. The wooden type weighs a good deal more. Load with plaster and hold in the left hand while the right does the work. 3. Darby: a two-handled smoothing tool to level large flat areas. It is held flat against the wall as it is moved along and levels out raised spots. 4. Screeding Rod: a straight-edged wood or metal stick to level off rough plaster applications. One end is usually held against guides as the upper end scrapes excess plaster back onto board for reapplication. 5. Water Brush: this, and a bucket of clear water, must be kept on hand for finish plaster coating. The brush spreads as well as dashes water over the surface being troweled smooth.

To mix, use either a wheelbarrow or shallow wood box and mix the sand and plaster, dry, in one end. Tilt the mixing box with the dry mixture in the upper end and put water in the low end. Then draw the mixed sand and plaster into the water a little at a time, mixing constantly. If water is added into the dry mix, or all of it is pulled into the water at once, lumps are formed which can't be easily broken up. Mix to a heavy creamlike consistency. Add more of the dry mix or water, as necessary.

Apply the base coat as shown in the photographs. The final coat of finishing plaster is mixed with water without sand and applied as illustrated. Troweling technique is quickly mastered. Plaster is applied from a full trowel on upward strokes, using light pressure only. The trowel, in finishing, is held at an angle of about 30° to the wall. If pressed fiat against the wall, the trowel is held by suction and will pull the plaster off. If the angle is too great, the edge of the trowel will leave wavy lines in the surface.

Repair of Plaster Walls

Sooner or later, almost every plaster wall and ceiling develops cracks - if not in the broader expanses, then at least where flat surfaces join one another. Wind pressure on the house, structural expansion and shrinkage, traffic vibration, and household activities all contribute toward weakened plaster. Before any redecoration can take place, the inevitable patching must always be done.

First, clean away all material that appears loose in and around the crack. If it's a fair-sized crack, use a putty knife and a beer can opener and open the crack to its deepest part, then undercut it so that it's wider underneath than on the outer surface. Little cracks can simply be brushed clean. With a spray, a sponge or a wet rag, thoroughly dampen all surfaces of the crack. If this is overlooked, moisture from the new plaster will be absorbed into the wall, leaving the patch powdery and weak. Mix patching plaster to a thick paste and pack it into the crack with a putty knife, preferably a flexible one. (For thin, hairline cracks, use a paint brush.) Press the mix into the bottom of the crack, build up slightly more than necessary, smooth off the excess, and let it dry for 2 to 4 hours. Then use medium-grit sandpaper on a flat block to smooth off the excess. If you are going to paint later, a few strokes with fine-grit sandpaper will finish it off nicely. Before your paper or paint over this patchwork, brush on one coat or more of thinned shellac as a size coat. If there is no "glazed" look to the size coat when dry, apply a second coat.

One word of caution - when the job is finished, don't pour excess plaster down the sink, for it will solidly block the drain pipe. If you mixed the material in a china or plastic bowl, it's easy to clean out for the next batch. Each quantity mixed should be just what you can apply in 10 minutes. After that, it starts to harden and has little holding strength left.

The general procedure for patching holes where plaster has fallen from the wall is the same as for patching cracks: undercutting, cleaning, dampening and applying new plaster. Before applying the patch, however, make sure that the lath or other plaster base has not come loose from the framing members behind. If it has, nail it back into place.

In the case of wooden lath that is broken, you will have to enlarge the hole in the plaster until two adjacent studs or joists are exposed. Then remove the broken laths and replace them with short lengths of lath nailed to the studs. If the hole is more than an inch or so in diameter, apply the patching plaster in two coats. First put on a fairly thick under-coat and, before it has quite dried, score its surface with an old comb so that the next coat will bond to it. After the undercoat has dried and set, dampen the surface and apply the thin finish coat. If the area of the hole to be patched is larger than approximately one square foot, you will find difficulty in doing an adequate repair job with patching plaster alone. One way of repairing such large holes is to apply two coats of gypsum plaster as is done in ordinary plastering and then a third coat of finishing plaster. Another way, perhaps easier, is to cut a piece of plasterboard to fit the hole, nail it in place to the lath and apply a finish coat of patching plaster.

To repair a bulge, first create a hole where the bulge appears. Do this by rapping the bulge with a hammer until the loosened plaster falls out. Be sure to knock or pry away any loose plaster around the hole so as to have sound plaster at the edges of the patch.

Related Articles - plaster, plasterer, plasterers,

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