Did I get reasonable prices?

[gadeberg]

Hello!

I checked what some things for the basement would cost. Wanted to see what you think about the prices. No one could say what they would charge for 35mm Isodrän boards. Anyone have an idea of the approximate price?

Place no. 1 prices + VAT
Reinforcement mesh 235*500 190kr 20cm spacing
Cement 38kr per bag
Polystyrene insulation 50mm 44kr/m2

Place no. 2 + VAT
Reinforcement mesh 11m2 270kr 15cm spacing (I think it suits the underfloor heating better)
Cement 35kr per bag
Polystyrene insulation 45kr/m2

These are local places. It's about 50km to the nearest discount store like Jem&Fix, Cheapy. If you need insulation for 70m2 and cement for 7m3, it will take a few trips.

 

[MartinT]

I think the prices seem to be very good. At Byggmax, they charge 229kr for a reinforcement mat 11.75 sqm, and 35kr/bag for cement. They don't have regular Isodrän there, but they do have regular cellplast (EPS) in quality S80, 50mm thick costs 40kr/sqm.

 

[styrman1]

Quality S80 is not sufficient according to some, but byggmax cuts corners as usual.
Lower quality but cheap. Price is everything.

 

[gadeberg]

I think the prices seem very good. At Byggmax they charge 229kr for a rebar mat 11.75 sqm, and 35kr/bag for cement. They don't have regular Isodrän there, but they do have regular styrofoam (EPS) in quality S80, 50mm thick costs 40kr/sqm.

Mine is plus VAT, so it will be a bit more expensive.

 

[MartinT]

Quality S80 is not enough according to some, but Byggmax cheats as usual. Lower quality but cheap. Price is everything.

Byggmax does not cheat, it is clear what you get. For a standard slab on grade of 100mm, the pressure from the slab including the floor is about 2.5 kPa, and S80 has a long-term load of 28 kPa, i.e., well over 10 times what the floor weighs. Of course, the pressure becomes higher under external walls and load-bearing walls, and in those areas higher quality than S80 may be needed, but for the rest of the slab, it is sufficient.

 

[MathiasS]

Quality S80 is not sufficient according to some, but byggmax cheats as usual. Lower quality but cheap. Price is everything.

S80 is perfectly sufficient for a basement floor that almost entirely lacks load beyond its own weight.

It would only be cheating if what is sold does not meet the S80 standard, right?

 

[gadeberg]

S80 standard is what?

But no big reaction on the prices. Feels good.

 

[MartinT]

S80 standard is what?

The quality of EPS is usually measured by indicating the compressive strength for short-term load, which in practice is the breaking strength (10% deformation) expressed in kPa (kilopascal). A higher short-term load also results in a higher long-term load, which is actually what is interesting for a house foundation.

S80 thus has a short-term load (breaking strength) of 80 kPa, S60 = 60 kPa, etc.

The compressive strength has only a marginal impact on insulation ability.