<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR> I've cooked a lot of butts too but have never used sand. Think I'll try it next overnighter. What do believe caused the temp spike during the night. Perhaps breeze ? Do you use the standard pan with the sand ? <HR></BLOCKQUOTE>Paul,
I've not used sand enough to be any kind of expert with it, but I like using it on butts because its one less thing I have to maintain while cooking overnight (no need to fill the water pan every couple of hours). I use the stock WSM pan filled about 3/4 or more with sand and put foil on top of the sand to catch the drips. I seem to have better fuel efficiency with sand. My WSM runs hotter with sand than with water so my vents openings are smaller to maintain the same temp and I use up less fuel. Sand is not as good a heat "sink" as water so as the sand heats up the temp goes up and with no one to adjust my vents while I sleep, the temp climbs (I had my vents set at 10% open each when I went to bed - my lid temp at midnight was 255 and at 6:30am it was 270.) It was also breezy, so that probably played a role as well, but I've had that overnight temp climb with sand before.
I don't use sand if I'm cooking a brisket because I believe (rightly or wrongly) that I need the moisture the water creates to keep my briskets from drying out (too much) while they cook. Briskets are hard beasts to master and a moist cooking environment can only help. Thats not a problem with butts.
I'm ambivalent about using sand with ribs. I just haven't cooked enough with it on short cooks to judge whether or not I think it makes a difference. Just my two cents.