Preparing different substrates
From an existing wall to a new plate base.
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This way you pass on useful information about a wall
Make a distinction between substrate and finish
The substrate is for example concrete, masonry or a plate construction. On it can be plaster, paint, wallpaper and old repairs. Describe what you know and send images of any exposed edges. If the structure is unknown, please mention that. A description as a white wall says little about what the new layer should wear.
Report deviations separately
Note where layers are loosened, the wall powderes or moisture was previously visible. Make images of the entire wall and of the deviation with a recognizable size included. Also show material transitions and connections. Different carriers can ask for separate detailing. It makes more sense to discuss such places in advance than to hide them under a uniform finishing layer.
Pre-treatment follows from the chosen system
A adhesion bridge and a product that regulates suction do not have the same function. The product choice follows from the substrate and the new plaster layer. Therefore, keep information on previously used products. In the quotation, please indicate what preparation is needed and ask for advice before applying an extra layer to the wall.
This is what you discuss in advance
- Describe substrate and existing finishing layers.
- Photograph connections and abnormal spots.
- List previously moisture and known products.
Take a closer look at the subject.
Illustrative images in preparation, substrate or finish.
From an existing wall to a new plate base.
Start with an assessment
Concrete, sheet material and existing plaster have different properties. Paint layers, contamination and earlier repair play a role. The visible top layer does not always tell enough about the build-up.
Check the connections
Transitions between materials, seams and connections require extra attention. Whether and what reinforcement, pre-treatment or detailing is needed must fit the chosen system.
Tell me what you know about the wall.
Please indicate which work has been carried out before and where moisture or cracks have occurred. The first assessment can be done with more targeted overview and detail photos.
Discuss your situation
An article gives general explanation. The correct execution follows from the assessment of your space, the chosen materials and the manufacturer's requirements.
Ask your question.Show the complete structure
Concrete, masonry, plates and existing layers have different properties. Note product names and previous treatments and tone material transitions. The suitable primer and build-up of the plaster layers follow from the substrate and the chosen system. A strong end layer makes a loose substrate not reliable.
- Describe the existing condition.
- Make the desired result concrete.
- Capture preparation and follow-up.
- Save product data and appointments.
Deepen this topic
Choosing primer for absorbent surfaces
The suction and adhesion of the substrate determine the pre-treatment and the chosen patch system must be appropriate.
Read more →Choosing the right plasterboard
Plates differ in properties and application. The plate, assembly and joint construction determine which finish is suitable.
Read more →More answers on this topic
Is every primer the same?
No. Products can have different functions and applications. Choose them appropriate to the substrate and the next layer and follow the corresponding requirements.
What if I don't know what's on the wall?
Say that when you request and send clear detailed pictures, the performer determines whether further inspection or a test is necessary before the construction can be selected.
From recognition to an appropriate build-up of plaster layers
A mixed wall can consist of old plaster, a closed pipe strip and a new piece of sheet material. The surfaces do not need the same suction or movement. Therefore, let the transition be assessed as a whole. One layer of primer does not automatically make different constructions the same.
A useful checklist
- Identify the substrate and existing finish before choosing a product.
- Let loose, contaminated or dampened parts be assessed.
- Review material transitions, joints and possible movement separately.
- Follow the combination of substrate preparation and patch prescribed for the system.
Comparing substrates
| Component | What should you discuss? |
|---|---|
| Smooth concrete | Check adhesion, contamination and appropriate adhesion pre-treatment. |
| Absorbent masonry wall | Assess suction; adjust regulatory pre-treatment to the patch product. |
| Plasterboard or plaster baseboard | Fix the plate type and follow the corresponding joint and finishing structure. |
| Existing plaster layer | Allow carrying capacity, old paint, damage and possible moisture load to be assessed. |
| Different materials in one plane | Take transitions, possible movement and connection details separately. |
| Existing tile wall | Check that the tile itself is stuck and that the entire chosen system allows this substrate. |
The same primer is not automatically suitable for all rows. Choose the pre-treatment together with the patch and the actual substrate found.
Discuss your plastering project.
Send your wishes, images and estimated dimensions. We will check which preparation and finishing suits your home.