Indy Total Construction

The main problem when plastering corners, whether external or internal, is getting a good, sharp angle. You will face a similar problem at the junction between the wall and ceiling. However, the techniques for dealing with both types of corner are not difficult to master.

There are two forms of guide you can use for forming an external corner: a timber batten or purpose-made metal beading.

The wooden batten is used as a thickness guide for the floating coat then the finishing coat on each wall. Nail it on to one wall so that it projects by the right amount beyond the other and use as a ground for that wall. Then, when the plaster has set, move it round the corner and repeat the process. Any sharp ridges on the apex of the corner should be sliced off with the trowel blade and then the corner rounded off with a block plane or rasp. With wallboard you must tape the angle first.

Two depths of metal beading are available to deal with masonry or gypsum board-clad walls and they can be fixed in place with plaster or galvanized nails. On wallboard, nails must be used. The beading acts as a ground for the floating coat on masonry walls. Before this hardens, cut back the level to allow for the finish coat. Trowel off flush with beading, leaving the nose exposed to provide a knock-resistant corner.

For dealing with internal corners, you need a long wood rule. Use this to rule the floating coat outwards from the corner.

After keying the floating coat, cut out the angle by running the corner of the trowel blade up and down it, holding the blade flat against each wall in turn. This will produce a sharp angle. The finish coat should be treated in the same manner. The final job is to hold the short side of the blade against one wall so the long side is just touching the fresh plaster. Hold the blade at 30′-40° and gently run it down the corner.

For finishing corners where both walls have been plastered, use a special V=shaped angle trowel. This produces a constant right angle in the fresh plaster. Load a small amount of plaster onto the angled blade of the trowel and run it lightly down the angle.

Directions:

1. Reinforcing the external corner of a masonry wall with angle-bead; set it into blobs of plaster, 12in apart.

2. Plastering one wall; work away from the corner, using the nose of the bead as a thickness guide.

3. Plastering the adjoining wall in the same way: leave the nose just visible. Score the surface of both walls.

4. Applying the finishing coat, this time covering the nose: round off the corner by running a wet finger along the bead.

5. Securing angle-bead to the internal corner with galvanized nails; nail through the drywall into the stud.

6. Applying a coat of finishing plaster, working away from the corner; the nose should be left visible in this case.

You need only apply two very thin finishing coats directly over the drywall.

The plaster needed for the job is sold ready mixed or in a powder form requiring only the addition of water. It is mixed in the same way as other plasters and has a creamy texture.

Because you are only applying a finishing coat to the drywall board there is no need for thickness guides, except at any external corners.

It is a good idea to practice scooping the plaster from the hawk on to the trowel first, using a spare piece of drywall to try your hand at spreading the plaster and making it stick to the board_ The technique is to hold the hawk in your left hand (or right if you are left handed) so the top is level and set the trowel blade on edge, so it is at right angles to the top of the hawk. Use the trowel to push some plaster towards the edge of the hawk, scooping it off at the same time as tilting the hawk towards you. The whole is done in one smooth movement.

The first job is to seal the joints between the individual panels of gypsum board, reinforcing them with perforated paper tape or nylon tape to prevent the plaster cracking. The standard paper tape is available in 2in wide rolls of 50-500 feet.

Cut strips of tape to run the length of each joint, including any horizontal ones, before you begin plastering. They must be exactly the right length and should not overlap or be folded, otherwise the plaster will not grip the wall properly.

To seal the joint, spread a thin layer of plaster, about 4in wide, along it from bottom to-top. Hold the trowel so that the blade is at an angle of about 30° to the wall, reducing it as you move up the joint and the plaster on the trowel thins.

While the plaster is still wet, press the tape into it. The easiest way to do this is by draping one end over the blade of the trowel and pressing this into the plaster at the ceiling. Then gently slide the trowel down the plaster, positioning the tape with your other hand. Once the tape is in place, run the trowel carefully up the plaster to make sure it is bedded properly. Treat all the other joints between the panels in the same way.

When the taped joints have dried — which should take about 11/2 hours — fill in the areas between them with more plaster. Work upwards from the floor, spreading the plaster in thin vertical strips and being careful not to build up ridges at the joint positions. Stop just short of the ceiling and work downwards from there to get a clean, sharp angle.

Unless you are working on a very small area, by the time you have finished putting on the first coat, the area you started on will be ready for the second coat. This should be about 1/sin thick and applied with long, sweeping strokes to eliminate ridges. Start at the bottom corner of the wall and work upwards and along to make one continuous coating.

Allow the plaster to set slightly and then go back over it with a clean trowel to smooth off the surface. Finally, when it has hardened fully, “polish” the surface by splashing clean water on to it with a paintbrush (about 4in wide) then sweep the trowel back and forth lightly. This will give a smooth, matt finish ready for decoration.

For a tight fit, you should only measure and cut a skirting board after fixing the adjacent one in position. What’s more, neatness dictates that the ends have to be cut in the right way.

External corners are always mitred. You can use either a deep mitre or box, or a circular saw which should be set to a 45° bevel, and drive light nails through the completed joint. Where walls meet at odd angles (eg, round bay windows) you’ll have to gauge each angle with a sliding bevel, and measure it with a protractor. Then re-set the bevel to half the angle, and mark the pieces accordingly.

On internal corners, however, a mitre will tend to separate and show a gap because, when you fix the second board against the wall, it will tend to move away slightly from the first board. The answer is to scribe the profile of the molding onto the second board — see opposite. Cut it out so that its end fits snugly into position over the first board. Then cut it to length at the other end. (Plain boards, of course; can just be butt-jointed.)

The fixing itself depends largely on what’s behind the old skirting. If it’s fairly recent, the plaster will probably run right down to the floor, the skirting being simply nailed on top of it. Nail the new piece on in the same way, using masonry nails long enough to pass through both layers of plaster and into the brickwork — say 63mm (2 1/2in).

For a hollow timber-framed stud partition, use ordinary oval or lost-head nails, making sure they pass through the cladding and into the timber sole plate (into the studs. too, in the case of wide skirtings). Ordinary nails will also do for solid walls of soft blocks.

The idea of an architrave is to hide the join between a door or window frame or lining and the surrounding plaster

A loose architrave can be nailed back in place to the door frame, or even screwed to the surrounding masonry if you drill right through it with a masonry bit and insert wall- plugs to take the screws. But removal and fixing are both easier than for skirting, so replacement is usually the sensible alternative to major repairs. You just lever the existing architrave off, and nail the new one on.

On a brick or block wall, you usually nail through the molding’s inner edge and into the doorframe, lining or ‘wrought grounds’ with 25 mm (1 in) oval nails; lost-head nails or panel pins can also be used. But if necessary you can nail through the middle of the molding and into the wall itself, using cut nails for medium-hard blocks if you like, and masonry nails for bricks and hard blocks. If you find that there are rough (concealed) grounds between the plaster and the frame or lining, then nail into those. On a stud wall, nail into the studs.

At the bottom, the upright pieces butt against the floor and the ends of the skirting. At the_ top the corners are mitred. A good idea is to start by cutting off three pieces of molding which are manageable but still slightly too long. Then you can mark off the heights of the two upright ones (which may of course differ a bit, depending on whether the floor is flat or level), mitre their top ends and fix them loosely to the wall.

This makes it easy to mark off the exact length of the top piece. Mitre its ends, position it, and make any adjustments – by moving the uprights slightly, and even shaving the mitred ends with a sharp chisel or block plane if necessary. Then nail all three pieces finally in place, and pin the mitres from the top as for skirting boards.

When mitring, always make quite sure you’re cutting the right way round. That sounds silly, but you’ll find it’s all too easy to waste whole pieces by mistake

Failing that, a hacksaw should do the job.

In certain places — eg, the backs of alcoves — the skirting board is held in position by the two pieces at right angles to it. So, unless you remove at least one of those first, sawing the board out is your only option. A flooring saw may work. Otherwise drill a series of holes in line dOwn the face of the skirting, and use a chisel to chop out the waste between the holes so you can prise out the two ends of the board. Pipework and other obstacles sometimes force the same solution.

If a length of skirting refuses to come away completely, you may still be able to make sawing easier by levering enough of it out to push timber wedges behind it. In all cases, it’s best to saw at an angle of 45° across the thickness. If you’re just removing a section, cut the new piece to the same angle when you come to fix that in place.

Always use 45° cuts, rather than butt joins, if you have to make up a long piece from two shorter ones. They’ll be less conspicuous, especially if you site the join near an out-of- the-way corner.

Skirting boards are generally the widest and longest moldings around the house. They’re fixed, of course, along the bottom of walls, where they prevent damage to wall coverings and make a neat join with the floor.

Sometimes plain square-edged timber – say 150x25mm (6xl in) planed – forms a skirting, but molded pieces arc more usual. Nowadays ‘torus’, ‘ovolo’, ‘ogee’ and the plain chamfered and rounded types are by far the commonest. Plastic skirting boards are another modern development.

A gap between the skirting and the floor surface can easily be hidden with a quadrant molding – nailed to the skirting. not the floor, so any shrinkage or swelling in the floor won’t open up cracks visible from above.

If a skirting board has simply come loose, use a torch to look behind it for any wooden battens or plugs into which the original fixings may go. Then nail through into these. If the plaster continues to the floor, nail through it into the masonry behind. But if there’s bare brickwork without such battens or plugs – or if your nailing loosens previously sound fixings – you’ll have to use countersunk screws and wallplugs, inserted into holes made with a masonry drill.

If, however, actual damage or rot demands the removal of one or more whole sections, a bolster chisel makes a good lever for prising boards off. The best place to begin removal is at an external corner; otherwise take the overlapping board at an internal corner, or start at the point where the skirting meets the doorway.

Usually skirting boards are nailed in place, but you must be alert for screws (their heads may be covered with filler or even wooden plugs). Unscrew them. first, or, if that’s impossible, cut away a little plaster above the skirting board and slip a cold chisel behind the skirting to chop through them before you finish prising the board off.

Not too long ago, the only wall covering available was wallpaper. Today wall coverings are made of many materials other than paper. Fabric and vinyl are good examples. Some types are prepasted or have adhesive on the back. No matter which type you use, the basic procedures are the same. You will have to:

Measure

Prepare the wall surface

Prepare and hang wall covering

To find out how much wall area must be covered, measure each wall and multiply its width by its height. Adding the answers will give you the total area of the wall surface. Next measure the doors and windows. Find their total area by multiplying each one’s height by width and adding them together. Now subtract the total area of the openings from the total area of the wall surface. The answer is the wall area to be covered. Since one roll of wallcovering contains about 30 square feet, divide this number by 30. The answer is the number of rolls you will need.

Many do-it-yourself wallpapering kits contain all the tools you will need.

Before you begin, the wall surface should be clean and free from loose plaster and paper. Surfaces painted with enamel should be sanded to remove the gloss and assure good adhesion. Remove any old wallpaper. Use a steamer or wallpaper remover to lift the paper, and then strip it off.
New walls must be primed before covering.

The most difficult job is hanging the wall covering just right. Begin by attaching a plumb bob to the end of a chalk line. Measure the width of one roll (usually 231/2 inches) from the starting point and hang the plumb bob. Snap the chalk line on the wall. This line will serve as a guide for hanging the first piece.

Cover your table or work surface with several layers of newspaper and unroll the first strip of wall covering. Cut the first piece, allowing two inches of overlap at the ceiling and two inches at the floor. Unroll the next piece and place it alongside the first to match the pattern. Cut enough strips to cover one wall and number them on the back.

Spread paste on the back of the first strip. Be sure to leave no dry spots and pay special attention to the edges. Loosely fold up the bottom half, printed side out, for ease in carrying. Position the strip at the ceiling and smooth it with a brush, working from the center out to the edges. Unfold the bottom section and continue smoothing down.

If the old wallpaper is loose, if you are going to hang vinyl wall covering, or if there are several layers of wallpaper on your wall already, it is best to remove all the old paper before you hang the new paper. This can be done most easily by renting a steamer.

Be sure to work out all of the air bubbles. After about 15 minutes the top and bottom overlap can be trimmed with a sharp blade. To prevent getting paste on the next strip, remove the top layer of newspaper from the table before you apply paste to the next strip.

Other types of wall coverings may need to be soaked in water or the paste may have to be applied directly to the wall. Follow the manufacturer’s instructions or ask the person who sells the wall covering.

Two types of seams can be used to join wall coverings. The overlap joint is one in which the sheets actually overlap each other. When using overlapped joints, begin alongside a window and work away from it. This will make the joints less conspicuous. Butt joints are preferred by professionals.

The edge of each strip runs along the edge of the previous strip without overlapping. When using butt joints, begin hanging paper on the longest wall space without windows or doors and work around the room. For either type of seam, wait about 15 minutes for the paste to set and then press down with a seam roller. Carefully trim around electrical boxes.

Much valuable information is often printed in the margins of the wall covering, including trim marks, marks to help you match the pattern, mill run number and manufacturer. Be sure to buy enough wall covering at the start because you may have difficulty matching colors or patterns later.

Apply paste to the bottom two- thirds of the sheet and fold up carefully. Do not crease. Finish applying the paste and carry the folded sheet to the wall.

Brush wallpaper from the center out to the edges. Smooth out all air bubbles.

Trim overlap with a straight, even line. Wall covering joints are either overlapped or butt joints. Professionals prefer butt joints.

Older walls and sometimes even new ones will need some repair before finishing. The most common wall repairs include:

• Dents

• Small holes

• Large holes

• Nail pops

• Split tape

You can repair dents by sanding around them, trowling joint compound (spackle) into the dent, and finally smoothing out the area. This is essentially plastering. Once it is dry, you can sand, seal, paint, or wallpaper the patch to match the rest of the wall.

Small holes are repaired like dents. A wad of newspaper behind the hole will prevent the joint compound from falling between the walls.

For large holes, you will have to patch a piece of drywall into place. Remove all loose material from around the hole with a utility knife. Then cut a piece of drywall to fill the hole. If the patch doesn’t rest on solid wood, set a screw in the patch to use as a handle. After the joint compound hardens, remove the screw and plaster the whole patch with joint cement. Then sand the patch to match the rest of the wall.

When the house framing expands or shrinks, nails pop and become visible under the paint or wallpaper. If the nails are tight, just drive them back below the surface with a claw hammer. Plaster the dent with joint compound. If the nails are loose, pull them if it won’t damage the wall, or drive them so deep they won’t come out again. Then drive new nails nearby. Cover the nails with joint cement. Use only drywall nails. Regular nails will rust when covered with joint cement.

Split tape is caused by the house settling. The tape will bulge like a bubble or blister or actually crack. Cut and pull off the loose tape. Remove all the loose tape or it will split again. Then sand the area and spread a thin coat of joint compound over it. With a wide putty knife work the tape into this compound. Plaster over the tape with compound. When it is dry, sand it.

Bathroom and kitchen walls are sometimes covered with ceramic tile. When a tile is cracked, it should be replaced. Start by removing the tile and old grout. You may have to break the tile with a hammer and chisel.

Repair large holes by cutting a piece of drywall to fit the hole. Cement the patch and hold it in place with a handle made from a screw. When it has dried, remove the screw and plaster, sand and finish the whole area.

Sometimes it is necessary to back a hole with newspaper when filling a hole with spackle or patching plaster. A piece of wire screen or plasterboard works well also.

Most wall repair is essentially plastering. On drywall, use drywall cement or spackle to fill the hole. Wood walls are repaired with wood putty.

Nail pops that are tight can simply be driven back in with a hammer and a nail set. Loose nails should be pulled or driven in. Drive a new nail nearby.

Although the tile is usually set in a special cement, it is much easier to glue the replacement tile with white epoxy cement. The wall must be dry. Use a putty knife or cover your finger with a piece of plastic or cellophane and work the epoxy around the tile to match the old grout. Hold the tile in place until the epoxy begins to set.

Clean all cement off the tiles before it hardens.

Wallpaper is difficult to repair. To replace a greasy or torn spot, carefully tear a piece of matching wallpaper from the front of the patch so the backing will be torn away from the edges. Remove the old piece. Match the pattern and paste down the new patch. The seams will always be slightly visible, but the ragged edges will make them less obvious.

Sometimes wallpaper bulges loose in a bubble. Cut a small slit in the bubble and force paste behind it, in order to work the bubble down. The cut is less visible if it is made along a straight line in the wallpaper pattern.

Remove all tape that is loose. Spread joint compound over the area and work new tape down with a putty knife. Then plaster over.

An uneven piece of wallpaper is less noticeable than one that is cut straight. Tearing the backing off the edges will make it even less obvious.

Gluing tiles with white epoxy cement is easier than using grout. The cement must be spread by hand to look like grout. Protect your finger with a piece of plastic.

Walls are the first thing anyone entering your home will see. They should be kept clean and in good repair.

There are many ways to finish walls. Probably the most common is painting. Paint preserves and beautifies many objects. It protects metal from rust, wood from mildew and plastics from sun damage. Paint also makes them easier to clean.

There are many types of wall coverings. Paper, plastics, and fabrics are some. Wall coverings can be prepasted and pretrimmed. Some are washable; and some are even treated for easy removal at a later date.

Paneling is easy to care for, and there are many different types to choose from.

Whatever type of wall finish you use, the job should be clean and neat. You should also know some of the chemistry of the materials and surfaces you are working with—what will mix and what may explode.

Painters will always have work. Even if the perfect paint—one that never wears out—is discovered, there will always be someone who doesn’t like the color!

Drywall is soft. It is best held in place with large headed drywall nails, screws or staples.

To prevent nails and seams from showing, nails are dented into the walls. The dents are then filled with drywall cement. Then you cover the seams with drywall tape and plaster over with drywall cement.

Finishing drywall seams. Apply compound over the seams and nail impressions. Work the tape into this compound. Smooth over, allow to dry, and sand.

In many modern houses, interiors are finished with drywall. Drywall normally comes in sheets, 4′ x 8′, 4′ x 10′, or 4′ x 12′. It is usually 5/16, 3/8, 1/2 or 5/8 inch thick. The most common size is 3/8 inch thick 4′ x 8′.

Drywall sheets are nailed to the house joists with large headed nails, screws, or staples. Nails are driven so that a small dent is made in the drywall. This depression is then filled with a type of cement and covered over with tape

There are three basic ways to finish drywall:

• Painting

• Wallpapering

• Paneling

You may apply paint directly to drywall. New drywall usually takes two coats: one to seal it and one to present an even, finished surface.

Wallpaper is becoming popular again. It comes in rolls and is applied directly to the drywall. Before it will stick, the drywall must be prepared with a glue-like coating of sizing. The trick in applying wallpaper is to avoid bubbles and match the edges and the pattern precisely.

Paneling is glued or nailed directly onto the drywall. Panels may be veneer, wallboard, imitation masonry, or some other material.

Moldings and baseboards finish off walls and ceilings. In older homes they are always made of wood. Most new molding and baseboard is made of synthetic materials which are more flexible and less likely to crack when nailed into place.