ᐅ Basement Insulation – Insulation Installation Between Waterproof Membrane and Screed
Created on: 3 Feb 2017 21:32
M
mampfHello everyone,
after a long search on the internet without a satisfactory answer, I am now asking the question here.
Our basement floor construction (160mm (6.3 inches) total):
15mm (0.6 inches) – Tiles
65mm (2.6 inches) – Screed
30mm (1.2 inches) – Tack board 30-3
45mm (1.8 inches) – Insulation (PUR / EPS / XPS)
5mm (0.2 inches) – Bitumen waterproofing membrane (Bauder G4 G200 S 4)
1. The first question is whether a PE foil (polyethylene sheet) is required between the waterproofing membrane and the insulation? The issue is plasticizers or a slip layer.
2. Is it safe to use EPS or XPS here without any concerns?
3. Is it possible to omit the foil if using PUR with aluminum facing? Would I then not need a slip layer? Is PUR resistant to plasticizers?
4. Is a PE foil needed between the tack board and the screed when using conventional screed (not flowing screed)?
Thanks for your answers...
after a long search on the internet without a satisfactory answer, I am now asking the question here.
Our basement floor construction (160mm (6.3 inches) total):
15mm (0.6 inches) – Tiles
65mm (2.6 inches) – Screed
30mm (1.2 inches) – Tack board 30-3
45mm (1.8 inches) – Insulation (PUR / EPS / XPS)
5mm (0.2 inches) – Bitumen waterproofing membrane (Bauder G4 G200 S 4)
1. The first question is whether a PE foil (polyethylene sheet) is required between the waterproofing membrane and the insulation? The issue is plasticizers or a slip layer.
2. Is it safe to use EPS or XPS here without any concerns?
3. Is it possible to omit the foil if using PUR with aluminum facing? Would I then not need a slip layer? Is PUR resistant to plasticizers?
4. Is a PE foil needed between the tack board and the screed when using conventional screed (not flowing screed)?
Thanks for your answers...
Hello "mampf".
I am only reading your request from February 3, 2017 today.
Regarding your questions:
1. Is a PE foil needed between the waterproofing membrane and the insulation? The topic is plasticizers or slip layers.
Answer to 1:
Yes, it is recommended. Waterproofing layers should always be protected as well as possible. Consider what kind of load will later act on the surface of the waterproofing. Even though it may be unlikely, small "locking" effects caused by movements in the insulation layer could have a negative impact.
-----------------------
2. Can EPS or XPS be used here without any concerns?
Answer to 2:
Yes. XPS is mainly chosen for high loads. Such loads are not expected in residential construction.
---------------------
3. Is it possible to omit the foil if using aluminum-laminated PUR? Would a slip layer then be unnecessary? Is PUR resistant to plasticizers?
Answer to 3:
Certainly, it can also be done "without". But the foil provides protection for the waterproofing at low cost. Polyethylene contains no plasticizers. Its molecules are very short and unbranched. When they polymerize into chains, they form spaghetti-like threads that can easily deform in any direction without locking or resisting. Therefore, they do not require plasticizers to be flexible and can be easily processed into films.
-----------------
4. Is a PE foil required between the fixing plate and the screed in conventional screed (not liquid screed)?
Answer to 4:
That also depends on the type of system board. In most cases, if the edges interlock securely (similar to snap buttons), no additional foil to prevent infiltration of mixing water into the underlying structure will be needed.
I am only reading your request from February 3, 2017 today.
Regarding your questions:
1. Is a PE foil needed between the waterproofing membrane and the insulation? The topic is plasticizers or slip layers.
Answer to 1:
Yes, it is recommended. Waterproofing layers should always be protected as well as possible. Consider what kind of load will later act on the surface of the waterproofing. Even though it may be unlikely, small "locking" effects caused by movements in the insulation layer could have a negative impact.
-----------------------
2. Can EPS or XPS be used here without any concerns?
Answer to 2:
Yes. XPS is mainly chosen for high loads. Such loads are not expected in residential construction.
---------------------
3. Is it possible to omit the foil if using aluminum-laminated PUR? Would a slip layer then be unnecessary? Is PUR resistant to plasticizers?
Answer to 3:
Certainly, it can also be done "without". But the foil provides protection for the waterproofing at low cost. Polyethylene contains no plasticizers. Its molecules are very short and unbranched. When they polymerize into chains, they form spaghetti-like threads that can easily deform in any direction without locking or resisting. Therefore, they do not require plasticizers to be flexible and can be easily processed into films.
-----------------
4. Is a PE foil required between the fixing plate and the screed in conventional screed (not liquid screed)?
Answer to 4:
That also depends on the type of system board. In most cases, if the edges interlock securely (similar to snap buttons), no additional foil to prevent infiltration of mixing water into the underlying structure will be needed.
Similar topics