Choice of mortar for exterior walls with cinder blocks?

[Mogg]

I am going to build an extension with concrete blocks. Half of the walls will be below ground level and the other half above. But the choice of mortar is a jumble right now since there is so much to choose from.. Something I have looked at is Webers thin joint mortar M10, Webers Flexoheft M2.5, mortar B at Byggmax.

Some cost more, others less. But what should I choose and what fits best?

 

[kanonkula]

Who are the manufacturers of the blocks? Usually, one should use the same manufacturer

 

[MagHam]

Mortar B at, for example, Byggmax will work perfectly for this.

 

[Stefan N]

Yes, I agree. You don't need to have a specific manufacturer for this.

 

[MagHam]

One more thing: Be generous with rebar in the shifts!

 

[Mogg]

Thanks for the answers! I will get bistål for the rows. Reinforcement after the first row and then at every third, is that enough? Including substantial overlap..

 

[MagHam]

Every third says the recommendations. I usually take a little extra where there are supposed to be openings for windows and doors.

 

[basseman]

Flexoheft from Weber if you use their products. Weber has good instructions for how to build a basement. I found the guidelines very useful when we expanded our house https://www.weber.se/leca-registred-produkter/hitta-ratt-systemlosning/kallarvaggar.html

 

[Stefan N]

I usually take a little extra where there should be openings for windows and doors

Always run over and under windows regardless of what is elsewhere.