Hi!
Our craftsmen (former) used a type C mortar on the house foundation which is built with masonry LECA. However, it was coated with red base (type A mortar) underneath.
Naturally, harder and more water-resistant cement-based type A or B mortar is recommended for a foundation, but in some documentation regarding KC-mortar (which I believe is equivalent to C) on Weber's website, it is stated that type C mortar can be used on a LECA foundation provided that it is coated with red base beneath. However, newer documents state that A or B is required.
To be able to make a successful claim, I would need to know what HUS-AMA prescribes in its recommendations. Does anyone know what is required according to these regulations? From Weber, you get slightly different answers, although the main recommendation is, of course, type A or B mortar for the foundation.
Very grateful for an answer,
/A
Our craftsmen (former) used a type C mortar on the house foundation which is built with masonry LECA. However, it was coated with red base (type A mortar) underneath.
Naturally, harder and more water-resistant cement-based type A or B mortar is recommended for a foundation, but in some documentation regarding KC-mortar (which I believe is equivalent to C) on Weber's website, it is stated that type C mortar can be used on a LECA foundation provided that it is coated with red base beneath. However, newer documents state that A or B is required.
To be able to make a successful claim, I would need to know what HUS-AMA prescribes in its recommendations. Does anyone know what is required according to these regulations? From Weber, you get slightly different answers, although the main recommendation is, of course, type A or B mortar for the foundation.
Very grateful for an answer,
/A
It's not just about mechanical strength, but also about the fact that lime mortar absorbs water. Now, I don't know if even C mortar, which only contains some lime, is a problem from that perspective.
A neighboring house to us, newly built around 1995, had issues with moisture being absorbed by the plinth, which discolored the two lowest courses of bricks on the facade. The solution was to chip away all the plaster from the plinth and redo it. Now, I only know that it was lime-based plaster, not exactly which type.
A neighboring house to us, newly built around 1995, had issues with moisture being absorbed by the plinth, which discolored the two lowest courses of bricks on the facade. The solution was to chip away all the plaster from the plinth and redo it. Now, I only know that it was lime-based plaster, not exactly which type.