Laying Concrete Block

Wood_Butcher_Dav · Nov 25, 2008

Over the summer I have been busy with my construction project. I'm building a garage that has a block stem wall that will be 3 layers above slab. The basic size is 28x40 with a 12x12 'storm' room. The questions;
1) How cold can it get before it affects mortar mix? I'm using 'S' Type cement mixed 3 to 1. My information is as long as it's above freezing during mixing. Not sure what happens if temps 40 during the day and drop in 20's at night. Opinions?
2) I plan on covering the top of blocks with treated 2x8 but not 100% done. What should be done if anything to prevent rain or moisture from getting inside the block and freezing causing cracking?

Just like to say this group has been an great inspiration to my projects.

Now some photos with tractors to keep everyone happy

Dave

pitt_md · Nov 25, 2008

The only experience I have with concret is when I built my house this spring. The mason told me that he could pour it when it was still freezing but I would have to pay for heat to cure it. This was for a poured wall foundation.

Just found this on the internet...

When new mortar gets below about 40 the curing process slows down which adversely affects the final strength of the mortar. When new mortar gets below freezing, the moisture in it expands as it freezes which will cause the mortar to break apart. Also, the sub-freezing temperatures will weaken the bond between the brick and the mortar. There are accelerators on the market which some people will bill as "anitfreezes." Not true, they accelerate the curing process, but won't protect the mortar until it is cured. If you need to lay the bricks in that kind of weather, your only alternative is to figure out a way to keep the brick and mortar above 40 degrees for a few days.