If you’re planning to refresh your walls or ceilings, you have likely come across two popular plastering methods: skimming, and float and set. Both deliver a smooth finish ready for painting or wallpapering, but they involve different materials, techniques and are suited to different needs. Understanding which is right for your project can help you achieve a great result, while saving time and budget. Here, we compare skimming and float and set plastering, highlighting the situations where each comes out on top.
What is Skimming?
Skimming is the process of applying a thin coat of finishing plaster over an existing surface to create a smooth, even finish. It’s most commonly used to tidy up old plasterwork, cover up slight surface imperfections, or update tired-looking ceilings and walls. Skimming is ideal for surfaces that are basically sound but need refreshing for modern decoration.
- Usually applied over: Existing plaster, plasterboard, painted walls (if sound), or after artex removal.
- Thickness: Roughly 2–3 mm.
- Finish: Very smooth, paint-ready, suitable for most types of décor.
- Best for: Contemporary interiors, repair jobs, and quick makeovers.
If you want a smart, modern look without completely rebuilding the wall, skimming is often the fastest and most economical option. Read more about skimming services in Cardiff.
What is Float and Set?
Float and set, sometimes called traditional plastering, is a two-stage process. First, a backing (or undercoat) plaster is applied to brick, block, or other masonry surfaces (“floating”). After this hardens a little, a thin “set” or finish coat is trowelled on for a smooth surface. This is an excellent choice for new walls, blockwork, or any area where plaster needs building up from scratch.
- Usually applied to: Bare masonry, blockwork, or where old plaster has been removed entirely.
- Thickness: Backing layer can be 10-13 mm, with a 2–3 mm finish coat.
- Finish: Durable, even and strong, ideal as a base for further decoration.
- Best for: Renovations, extensions, and new build walls or major repairs.
Float and set gives walls stability and can even out surface level changes. Discover more about float and set in Cardiff.
How Do You Know Which to Choose?
Your choice depends on the condition of your walls or ceilings, and what’s underneath. Here are some key points to help:
- Condition of Existing Surface: If the old plaster is only slightly damaged or uneven, skimming is usually suitable. This is popular for ceiling repairs or minor wall cracks.
- New Surfaces: For new builds or extensions with blockwork or masonry, float and set is needed to create a level base before finishing.
- Depth of Damage: If you have lost large sections of plaster (down to brick), or the wall needs rebuilding, float and set is the right approach.
- Timescale and Budget: Skimming is usually quicker and less disruptive, while float and set involves more preparation. For rapid projects on dry walls, dry lining and skimming may also be an option.
- Historical or Period Properties: Some older homes may require specialist methods, such as lime plastering, where advice from an expert is sensible. See lime plastering services for heritage jobs.
If you are unsure, a qualified plasterer can inspect the surface and advise whether it’s a candidate for either approach, or if more extensive repairs are necessary.
Performance and Appearance: Key Differences
Both float and set and skimming will leave you with smooth, paint-ready walls, but there are a few distinctions to be aware of:
- Durability: Float and set is thicker and more robust, so it’s better suited to high-traffic areas or heavy-duty refurbishment.
- Crack Hiding: Skimming covers up light cracks and surface marks, while float and set can resolve deeper blemishes and major flaws.
- Insulation: Float and set may help with both sound and heat insulation more than a skim coat, thanks to its additional thickness.
- Modern Look: Skimming is the go-to method for modernising properties or achieving an ultra-smooth finish.
- Complex Surfaces: For surfaces with curves or awkward shapes, traditional float and set can sometimes be adapted for better coverage. Decorative finishes, such as those offered with textured plastering, can also be built on a float and set base.
Alternatives: Dry Lining and Dot and Dab
When time is short or walls are especially uneven, modern alternatives like dry lining and dot and dab may be suitable. These systems use plasterboard fixed directly to the wall, then finished with jointing or a skim coat. They’re quick, minimise drying times, and offer good insulation, so often feature in large-scale renovations or new builds. However, they give a different feel and sound to solid plastered walls, and may not suit properties where solid construction is important.
If you have a bigger job or structural issues, it’s sensible to compare all methods and discuss with a local plastering specialist such as Caerphilly plasterers.
Summary: Which Plastering Method is Best?
Choosing between skimming and float and set depends mostly on what’s already on your walls, your schedule and your goals for the space. Skimming is perfect for freshening up solid, paintable walls. Float and set is a must if you’re starting from bare masonry, undertaking substantial repairs or seeking greater durability. For major changes or quick turnarounds, consider alternatives like dry lining and dot and dab.
If you need guidance on the best approach for your Cardiff property, or wish to discuss your options, Plastering Cardiff is here to help. From small patch repairs to full restorations, our local team can advise on the best technique for your project.
Frequently asked questions
Can skimming be done over painted walls?
Skimming can be applied over painted walls if the surface is sound, clean, and well-prepared. Loose paint and flaking areas should be removed first to ensure the new plaster bonds properly.
Is float and set more expensive than skimming?
Float and set usually costs more than skimming because it involves extra materials and labour. It’s generally used where walls need a new base plaster, not just a surface refresh.
How long do I need to wait before painting new plaster?
It’s best to let new plaster dry fully before decorating. This can take anywhere from a few days to a couple of weeks, depending on thickness, room temperature and ventilation.
Are there situations where neither skimming nor float and set is suitable?
Yes, in some cases—like major damp, severe structural issues or specialist heritage work—alternative solutions or repairs may be needed. Always consult a professional for tailored advice.
