Warning: don't trust the mix by eye on a cold morning, cost me 40 bricks last Tuesday
So last Tuesday I was laying a garden wall out in Roseville and it was about 38 degrees when I started. I mixed my mortar like I always do, same sand, same water jug count, and the first 15 bricks went down fine. Around brick 20 I noticed the bed was grabbing way too fast, like it was setting up in the tub before I could even tap them level. I pulled a few and the bond was garbage, so I knocked off the whole run and 40 bricks ended up in the scrap pile. Turns out the cold sand was holding moisture and I added my normal water on top of it, so my mix was way wetter than it looked. Now I check the squeeze with my trowel before I commit a whole course. Anyone else run into sand holding water this time of year, and do you adjust your jug count or just feel it out?
How much water does that sand actually hold when it's been sitting out in the cold? I keep my sand under a tarp but it still pulls damp from the ground this time of year, and I've never been able to pin down a number. Do you go by the squeeze test alone, or have you ever weighed a bucket of wet sand against a dry one to see the gap? Trying to figure out if there's a rule of thumb or if you just learn it by feel over the years.