Basecoat Basics (Part 2)
Top and bottomOne very effective way of tackling a new home with veneer coat plaster is with a three-person crew--one laborer and two plasterers.
When two plasterers are working together in a room that has 8-foot ceilings, the work is usually divided between the top and bottom sections. The top person does the ceiling and down to the top of the windows all the way around the room, with the bottom person doing from there down to the floor. Some crews work together, all in one room and knock the whole thing out at once. Others have the top person running on in one room, with the bottom person doing bottoms in an adjoining room. When they get their work done, they simply switch rooms, thus completing two rooms at a time. Some top persons work on stilts, others use rolling scaffolds or ladders.
The real question is how good is the top person? If he loses a lot of basecoat while he plasters, there are going to be a lot of splatter on the wall areas below as it hits the floor. If this is the case, it's best to have the bottom person follow up after the top person is done. This way he covers over any splatters as he completes the bottom area. If the top person is skilled, both workers can complete a room together or the bottom person can complete the bottoms ahead of them and move on to the next area.
Plastering stepsLet's look at some pictures to see some tips on actual application. In photo #1 you'll notice two techniques that prove helpful as a wall area is plastered. First, the mesh tape is covered with a coat of basecoat. This holds the mesh in place and also ensures that enough plaster is covering the tapes so that they do not telegraph through and become visible later because of a lack of material over them (this is a vital point). I've seen homes where plasterers, to save a few bucks, "burn" the basecoat on in a very thin layer. This action raises the seams and all of them show through the finished product. The second thing you'll notice is I am pre-filling the corner bead. I do this because it often requires a thicker fill of basecoat, and when the bead is filled the first time, it has a tendency to shrink slightly as the board absorbs some of the moisture out of it. So I run my beads ahead of time, then complete the wall, ending up at the bead again and putting another coat over the area I had pre-filled.
This cleans the beads and creates a space for the finish coat to fill. This type of technique is used where the plaster will be painted or where the beads will show when all work is complete. I have seen some styles where the beads are overfilled and the texture is actually used to cover the beads. The only problem with this is that plaster left on the beads will easily pop off if hit with any force. That's why I prefer to clean the beads back and leave the covering of them to the painters!
And one more tip: Remember that if a batch does start setting, there is a certain order of priority that should be followed. Getting the wall or ceiling smoothed out and complete as possible is number one, including running all corners. For the laborer, getting the barrel cleaned out is of utmost concern. Some race around looking for bags to put the basecoat into. Sometimes, there's just enough time to dip it out onto the floor (another good reason to cover the area with plastic). Tools can be cleaned after everything is said and done. For tools, the mixing paddle and the barrel for that matter, WD-40 works great. It makes cleaning much easier. At the end of the day it is good to spray everything down with it.
In photo #7 you can see one way of doing the top section of a room. Stan is working off of a rolling scaffold. He pre-filled the mesh tape, bead and also the angles in the tray, then went back and filled these out again when he covered the entire area with base. He completed a section as he went, to ensures everything was ready to finish when he was done with that area. Photo #8 shows an area that we were working on and it brings up a question that some have asked: What do you do if you run out of basecoat? Good question! Sometimes you plan on doing one room or an entire area and there is not enough material.
The simple answer is: mix more! The real question is how do you blend in one batch to another? There are two methods I've found work well. First, if the basecoat you've run on has not set up, you can join on to it pretty easy without any build-up between old and new. If the basecoat is set up, you'll have to watch overlaps as you finish the area.
Notice in photo #8 that we tried to keep the area neat and square where we would join on with the next batch. One tip is to use a wet sponge to blend the new basecoat in where it joins the areas that are set up. This is important if these areas are going to be sand swirled. It's difficult to hide these overlap lines if sand finishing the same day.
This raises another question that's been asked: How much area should be basecoated at a time? The answer again depends on the style and methods each plaster crew uses.
Some like to brown coat until 10 a.m. or noon, then double back and finish that area the same day. Some brown coat the entire house and then do the finish coat. The advantage of finishing the same day is that you use the moisture that's in the wall or ceiling to good effect. Since the surface is somewhat wet, the finish spreads easier and therefore less material is needed. Those who basecoat a house straight through will often fog down the walls they plan on finishing to put moisture back. This works pretty well if the fogging is done consistently over the area.
I realize this doesn't cover everything about veneer basecoat but I hope it helped you see that this could very well be a system you could learn pretty quickly and do a good job on. If you have any questions, let me know. There was such a large amount of interest in this subject that we have putting together a new video called "Basecoat Basics." I haven?t seen anything like it on the market, so I thought it would be good to have a video that actually showed these techniques being done. Check out my Web site for more information (www.Plasterzone.com).
Next time we?ll talk about veneer coat finishing systems and how to profit from them. Thanks again for your letters and keep in touch!