ᐅ Self-adhesive vinyl flooring applied directly onto the screed
Created on: 6 Mar 2020 17:45
J
JaAberNein
Hello everyone,
We are planning to install self-adhesive vinyl flooring ourselves in some rooms of our new build (with underfloor heating). The substrate is cement screed.
After some initial research, I’m a bit confused about how to properly prepare the substrate and whether impact sound insulation is necessary (or is it only required for click vinyl?).
My questions:
1. Do I have to apply leveling compound over the entire screed surface before installing self-adhesive vinyl?
2. If yes: what happens to the expansion joints in the screed? How should I protect them?
3. What are the consequences if I skip the leveling compound?
4. After applying the leveling compound, do I install the self-adhesive vinyl directly, or should I add impact sound insulation first?
Many thanks in advance!
We are planning to install self-adhesive vinyl flooring ourselves in some rooms of our new build (with underfloor heating). The substrate is cement screed.
After some initial research, I’m a bit confused about how to properly prepare the substrate and whether impact sound insulation is necessary (or is it only required for click vinyl?).
My questions:
1. Do I have to apply leveling compound over the entire screed surface before installing self-adhesive vinyl?
2. If yes: what happens to the expansion joints in the screed? How should I protect them?
3. What are the consequences if I skip the leveling compound?
4. After applying the leveling compound, do I install the self-adhesive vinyl directly, or should I add impact sound insulation first?
Many thanks in advance!
bauenmk202012 May 2020 21:57We want to install click vinyl flooring in the attic rooms and hallway. We are considering this product:
planeo Rigid Click Vinyl Oak Natural
waterproof & dimensionally stable RIGID core board
Does anyone have experience with this? I have samples with this rigid core and without. With the rigid core, I cannot bend the sample. With the "normal" version, I can bend it relatively easily.
We plan to lay it over the screed and possibly use an underlay for impact sound insulation. Is this advisable? I understand that impact sound insulation is generally beneficial, right?
planeo Rigid Click Vinyl Oak Natural
waterproof & dimensionally stable RIGID core board
Does anyone have experience with this? I have samples with this rigid core and without. With the rigid core, I cannot bend the sample. With the "normal" version, I can bend it relatively easily.
We plan to lay it over the screed and possibly use an underlay for impact sound insulation. Is this advisable? I understand that impact sound insulation is generally beneficial, right?
hausnrplus2512 May 2020 22:46I find that walking on vinyl feels more comfortable than on tiles! It’s basically “softer,” but more noticeable in the joints or when sitting, rather than sinking underfoot while walking. We have click vinyl flooring in the apartment. What we will choose for the house is not decided yet. The only thing that really bothers us is that you have to clean up spills very quickly when something drips, tips over, or the watering can overflows, because you don’t want liquid to get into the grooves =/
@ "JaAberNein":
Confused after these guidelines?
Here’s the situation:
No screed can be made perfectly flat— not even self-leveling screed— to meet the high flatness requirements needed for LVTs! A self-leveling compound, let’s call it that, has two main purposes:
1. to create the required flatness, and
2. to ensure consistent absorbency for proper adhesion.
Now, you want to install self-adhesive LVT, which doesn’t have a tongue and groove system. These tiles are usually only 2mm (0.08 inches) thick and are very sensitive to any unevenness.
Yesterday, I inspected such a surface in the Ruhr area where a strip of leveling compound about 0.2mm (0.008 inches) thick—likely accidentally applied to that spot—caused concern for the homeowner. Applying a leveling compound without any trowel marks (these are crescent-shaped patterns visible when viewed against the light) is a true craft!
That’s why nowadays it’s no longer smoothed with a trowel but spread evenly with a rake and then deaerated using a spiked roller. It’s not that simple with leveling compounds!
Also, keep in mind that you have underfloor heating.
Dry-set adhesives tend to lose significant bonding strength when exposed to heat. PVC planks will undoubtedly expand under these conditions. The forces generated by this expansion cannot possibly be absorbed by dry-set adhesives. Just check the product data sheet of the LVT for the term "suitable for underfloor heating / radiant heating." You likely won’t find it for the reasons mentioned above.
The proper approach is to smooth the screed surface with a self-leveling compound applied with a rake, then bond the planks using a wet-bed adhesive.
That way, you can avoid problems! Otherwise, you will face some unpleasant issues with the floor.
----------------------------
Regards and good luck with your decision: KlaRa
Confused after these guidelines?
Here’s the situation:
No screed can be made perfectly flat— not even self-leveling screed— to meet the high flatness requirements needed for LVTs! A self-leveling compound, let’s call it that, has two main purposes:
1. to create the required flatness, and
2. to ensure consistent absorbency for proper adhesion.
Now, you want to install self-adhesive LVT, which doesn’t have a tongue and groove system. These tiles are usually only 2mm (0.08 inches) thick and are very sensitive to any unevenness.
Yesterday, I inspected such a surface in the Ruhr area where a strip of leveling compound about 0.2mm (0.008 inches) thick—likely accidentally applied to that spot—caused concern for the homeowner. Applying a leveling compound without any trowel marks (these are crescent-shaped patterns visible when viewed against the light) is a true craft!
That’s why nowadays it’s no longer smoothed with a trowel but spread evenly with a rake and then deaerated using a spiked roller. It’s not that simple with leveling compounds!
Also, keep in mind that you have underfloor heating.
Dry-set adhesives tend to lose significant bonding strength when exposed to heat. PVC planks will undoubtedly expand under these conditions. The forces generated by this expansion cannot possibly be absorbed by dry-set adhesives. Just check the product data sheet of the LVT for the term "suitable for underfloor heating / radiant heating." You likely won’t find it for the reasons mentioned above.
The proper approach is to smooth the screed surface with a self-leveling compound applied with a rake, then bond the planks using a wet-bed adhesive.
That way, you can avoid problems! Otherwise, you will face some unpleasant issues with the floor.
----------------------------
Regards and good luck with your decision: KlaRa
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