Plaster Skim (Plaster Veneer): Definition, Benefits & Uses

What is Plaster Skim (Plaster Veneer)?

Plaster skim, or plaster veneer as it is known in North America is a construction method that is used to achieve a smooth surface on interior walls. It involves the application of a thin plaster mix normally over drywall plasterboards, alternatively known as dry lining or constructed gypsum boards. Once set, the plaster skim provides a finish that is ready for the painting or decorating process to begin.

The Benefits of Plaster Skim

Applying a layer of plaster skim to walls has some key advantages over the drywall, ‘mud and tape’ method, including:

• Appearance – skimming enables finish walls to have a perfectly smooth surface in readiness for painting and decorating; but, as plaster skim (plaster veneer) dries to a mottled white colour, it can replicate a mirrored surface. For some interiors, this bare plaster finish can be particularly desirable. It is also possible to add tints to the plaster to enhance the colour of its appearance.
• Moisture Resistant – plaster is an effective water barrier. When it is set, plaster skim is able to shed water, helping to reduce the build-up of mildew. 
• Time-Saving – unlike traditional plastering methods that require each layer of plaster to be completely dry before the next can be considered, plaster skimming can be completed in one session. Some wall surfaces may require longer drying allowances, such as lime finishes; however, with fewer steps to the process, skimming is considerably quicker.
• No Sanding – when applied by professionals it is unlikely that imperfections will need to be sanded away. As a plaster skim can be carried out over five hours, any indentations from the application are removed before the plaster goes off. Drywall equivalents require, in some instances, mechanical sanding to achieve a fine surface finish. 

The Durability of Plaster Skim (Plaster Veneer)

The final result of plaster skim (plaster veneer) results in a much more durable surface than regular drywall finishes. Consequently, scuffs and gouges are less likely to appear. Carrying out a plaster skim on interior walls will add to your budget more than leaving a drywall finish; however, this thin layer of plaster will add some extra benefits to your room.

Firstly, plaster provides added insulation and soundproofing to a room, much more than drywall plasterboards. This additional layer will help to improve the room’s energy efficiency, whilst reducing heating bills.

Additionally, it helps to enhance the room’s fireproofing. Drywall plasterboards provide fire resistance to a property due to the gypsum it contains. However, plaster is thicker and more durable than drywall and, therefore, provides a stronger barrier to fire.

What is Plaster Skim Used For?

The plastering trade has evolved over the years in an attempt to eradicate the challenges all tradesmen were encountering. One of the most prominent issues in building projects is the time delays that plastering causes. With each wall requiring three coats of plaster to achieve the desired finish, projects can easily be set back days while tradesmen and contractors wait for each layer to go off. To help reduce these delays, a new technique was developed to offer a faster approach, plaster skimming.

Skimming became a cost-effective alternative to re-plastering rooms. In buildings undergoing repair or cosmetic renovation, plaster skim can be used on top of old plaster to create a quality, smooth surface. However, it is also used on top of gypsum boards.

Applying a Plaster Skim (Plaster Veneer)

Are your walls in need of a fresh coat of plaster skim (plaster veneer)? If you only have a couple of walls to spruce up, you may feel inclined to have a go yourself. But, don’t be misled. Skimming can be a difficult task to take on, and the experts do make it look easy. However, with our step-by-step guide, you will stand in good stead.

The first thing to remember with plastering and skimming, in general, is that preparation is key. With the right surface prepped and ready to go, you will have the best chance of achieving a crack-free finish.

6 Steps to Plaster Skim an Interior Wall

1. 1. Equipment Checklist and Essential Preparation

To help get your skimming session off to a good start, it is recommended to double-check you have all the necessary equipment laid out, ready to go. From plastic sheeting and buckets to skimmer plates and safety glasses, make sure you have everything before mixing up your plaster.  

Next, it’s time to lay down the dust sheets, remove light switches and plug sockets and cover doorways to keep all the plaster dust contained in the one room.

1. 1. Cleaning and Priming the Walls

Another important step is cleaning off dust from all the walls that are to be skimmed, filling and sealing in any cracks as you go. If your wall has any loose plaster, scrap this away with your taping or drywall knife. Remove all nails from the surface too. 

Once your wall has been wiped down and is completely dry, you can use a water-based primer to prepare the surface. With a roller, paint all surfaces that are awaiting skimming. Primer is a key stage when skimming as it can assist the adhesion of your plaster compound.  

1. 1. Mixing Plaster

When your primer is dry, you can begin mixing up your plaster. For ease and convenience at home, you can use a quick-set joint compound. Mix with water according to the manufacturer’s instructions – for some mixes it may be easier to use a drill with a particular mixing attachment. 

Make sure you have read the time limit on the packaging. If you do not know this information, you won’t know how long you have to get the plaster smooth on the walls before it sets hard. Similarly, it is important not to mix up too much compound as once set the mixture cannot be softened.

The mix should resemble the consistency of mud. It is recommended for first-time plasterers to have some extra help. It can be handy having someone else to mix up your next batch when you begin applying the first.

1. 1. Skimming your First Coat

Now it’s time to start skimming. With a trowel in one hand and your skimmer plate in the other, transfer some plaster mix onto the skimmer plate. It is best practice to start in a corner and work your way down. Putting a small amount of mix onto your trowel, drag your trowel vertically while you apply even, firm pressure. 

When applying your next patch, make sure you overlap the previous bit of plaster.  This method is to help guarantee an even finish, where there are no gaps. Remember to work quickly, your plaster will have already started to dry out. 

1. 1. Additional Coat

Most walls will require two coats to achieve a smooth surface. What’s good about plaster skim is there is no need to wait for the first coat to dry before moving on to the second. Once you have covered the entire wall, simply repeat the process, paying particular attention to smooth out any trowel marks. As this is your first time applying a plaster skim, you may need a third coat to tidy up the surface.

1. 1. Smoothing Imperfections and Cleaning Up

Once all the coats are applied and have been left 24 hours to dry out, it’s time to turn your attention to any rough edges and bumps. Most professionals won’t require sandpaper in their application; however, plastering is an art and can be difficult to master. If your finish is a little rough here and there, simply take fine-grit sandpaper to work away any imperfections.

When you are happy with the surface, the last part of the process is clearing up the plaster dust ready for painting and decorating.

If skimming sounds a bit too technical and time-pressured for you, our plastering contractors are always on hand to offer you a free quotation to carry out the work on your behalf.

FAQ

How much does skimming cost in relation to plastering?

Skimming is significantly cheaper than re-plastering a room. If your wall is in good condition and only has a few cracks and indentation, skimming this with a top layer of thin plaster is more than sufficient.

The process of skimming commonly adds approximately 5-8mm of additional plaster to create a smooth surface. When most plastering is carried out, the dried surface will have a rough finish. Following this step with a layer of plaster skim allows for a decorative, smooth finish.

Is it possible to skim over old plaster?

Of course, as long as the plaster is in good condition then adding a layer of plaster skim (plaster veneer) will help to spruce up its appearance. Skimming is commonly used to cover up any cracks and indentations a plastered wall may have obtained over the years; therefore, providing a faster way to renovate a room.

You can also plaster skim over the top of painted surfaces too. The only thing to check is the quality of the paint and ensure the surface is cleaned thoroughly.

What’s the difference between skimming a wall and plastering?

Skimming is simply a technique of plastering that involves a thin layer of plaster in an attempt to create a smooth finish in readiness for painting and decorating. It is often used to freshen up old plasters, covering up any cracks and indentations that may have formed, or it can be applied to drywall or plasterboard.

Unlike plastering, which is a long and arduous process that involves multiple coats, skimming can be completed by a professional in no time at all. Traditional plaster requires a lengthy drying process, as each layer must be completely dry before the next coat is applied. However, with a plaster skim, with only one layer to apply, a project can quickly progress to the next step.

Does my wall require skimming or plastering?

When identifying whether your wall requires skimming or plastering it is important to assess to what degree your wall is cracked or chipped. Light wear and tear, including mild indentations, can be smoothed out with a quick coat of plaster skim (plaster veneer). Unfortunately, if your wall’s surface is particularly rugged and worn, the plaster will need to be reapplied.

It is also worth considering how you are going to decorate your room. Before applying paint, for example, a clean, smooth surface is recommended. Therefore, a fresh coat of plaster skim may help you achieve the best finish.