It's customary to wait at least 14 days to 3 weeks after plastering a surface to then tile onto it. This allows for the plaster to dry completely, and during this time you can start to make plans for how you start the job.
You need to skim over the bonding, don't apply tiles directly to bonding or browning. If area is to be tiled, the skim finish does not need to be spot on but as level and flat as you can get it, you can leave it a little rough as this will help key the tiles.
Newly plaster skimmed walls take approximately 4 days to dry out before you should attempt to decorate them. It is crucial to wait until the plaster has dried, and its colour has changed to a pale pink. There should be no brown patches as a guide. In some instances, you may need to wait up to 4 weeks.
If the wall has recently been plastered, you should allow 4 weeks drying time, before brushing with a stiff bristle brush and priming with Dunlop Tilers Primer (diluted 1:1 with water when using ready-mixed or two neat coats when using cement-based adhesives).
Freshly laid concrete should never be tiled onto immediately. Instead, you should allow the the concrete time to cure, settle and harden. As a rule of thumb: Allow one 'drying' day per mm thickness, up to a depth of 50mm.
All concrete shrinks so any new concrete slab needs to be dry and fully cured (for a minimum of 28 days) before tiling commences. Ensure any outdoor base has adequate movement joints built-in to allow for expansion and contraction and any structural movement in the substrate.
And while there are many different types of floors out there that are suitable for tiles, one of the more common ones you might come across is concrete. Regularly used in building projects, tiling onto concrete is an excellent option thanks to its strength and durability.
Drying Times
It's customary to wait at least 14 days to 3 weeks after plastering a surface to then tile onto it. This allows for the plaster to dry completely, and during this time you can start to make plans for how you start the job.
As a rule of thumb, plaster takes up to 4 weeks to dry completely.
Be prepared to apply at least two coats for a smooth finish. You don't need to wait for the first coat to dry before applying the second. As soon as you've finished covering a wall, go back to the beginning for your next coat, dragging your trowel.
On drywall, skim coat normally takes about 2–3 days to dry. On concrete surfaces or plastered walls, skim coat takes about 5–7 days to dry. In extreme situations such as high humidity and constantly damp substrates, skim coats may take more than 7 days to dry.
You should usually wait between 3-7 days after a skim coat has been applied before painting.
Level 5 // As you might have guessed, Level 5 is the gold standard. It's as smooth as you can get, or the highest finish possible. There are no bumps, no texture, and it's achieved by multiple skim coat layers that are finished with a good sanding.
Drying Times
New plaster work should be fully dried before tiling work is commenced, this drying time varies upon temperatures but can take up to 4 weeks before fully cured.
Once the skim coat is applied, it should be left to dry thoroughly. After drying, you can sand the surface to remove minor imperfections and create an even smoother finish.
When plaster dries out too rapidly it causes cracks or haze cracking. How soon can I paint my newly skimmed walls? Please ensure your plaster is thoroughly dry before you consider decorating. The plaster will take a minimum of 3-5 days to dry thoroughly and in some cases longer.
Good airflow will help to encourage your plaster to dry more quickly. If it's not too cold, it can help to keep windows and doors open. Similarly, a fan can help as long as you keep it on a low setting so that it doesn't cool down the room too much.
A minimum of seven days of curing is recommended for plastered surfaces. Grooves: After plastering the outer walls, cut grooves to prevent cracks caused by temperature differences. These grooves function as expansion joints in the wall.
New backing coat and skim coat plaster must be allowed to dry for at least four weeks prior to tiling and a new plaster skim coat on top of plaster board must be allowed to dry for at least seven days prior to tiling.
While screed takes a long time to dry completely, it doesn't mean you'll have to wait months before walking on it. Typically, you can walk on traditional sand and cement screed after 24 to 48 hours. This period allows the screed to gain sufficient strength to support light foot traffic.
You only need to sand old walls before painting. Newly plastered walls should already have an even surface to paint onto, but old walls may have rough spots. The best way to identify the rough areas is to run your fingers over the surface and feel for changing texture.
Screeds should be firm enough to walk on, usually at least 3 days after application, before tiling can be started. Concrete should be at least 7 days old. All substrates to be tiled must be clean and surface dry.
You usually need a vapor barrier for tile on concrete because concrete is porous. A vapor barrier creates a waterproof layer between the concrete and your flooring, and minimizes the risk of moisture-related issues.
You can tile straight onto new plasterboard, whether it's a stud wall or dot and dab, though you will have to be mindful of weight. A bare plasterboard can hold a maximum weight of 32kg per square metre, whilst a board with plaster skimming applied can only hold 20kg per square metre.