Patching the cracks in foundation blocks?

[ZZonka Tonka]

I'd like to keep some of the cold air from getting under the house this winter. I've got a lot of cracks and missing mortar between the blocks used for the foundation of my old house. I'm using mortar mix to fill them and finish them. Is there a better way? This seems like it will work but if there is a better way I'm open to suggestions. I'd buy the stuff in a caulking tube but it's going to take a lot and I'd have to buy out Lowe's to get enough to do the job. I'm using the ready mix mortar.

[Tony Hwang]

Hi, Expanding spray foam or concrete/masonry sealant? Tony

[default]

Umm.... why is your block foundation coming apart?

[ZZonka Tonka]