12:23 p.m. on August 31, 2009 (EDT)
PaulS said:
My budget is microscopic. ...
...Why aren't all tents made so you don't have to carry a ground tarp also?
Has anyone tried a fan to improve airflow and reduce condensation? At least for car camping? I have yet to sleep in a tent that does not have condensation issues and fans can be really small and light.
Good questions, Paul. I will venture a couple of unbiased opinions (WHA?!?! OGBO unbiased? HAH! Opinionated, maybe, but unbiased, never!)
"You know you are a dirtbag when your budget is microscopic". Having almost completed the new house and discovering there's a whole bunch of stuff like landscaping (the People's Republic of Palo Alto doesn't approve of dirt yards for some reason), replacement of things the movers broke, stuff that disappeared into unknown boxes that may or may not be in the storage pile, I can sympathize.
The big problem with tent floors is that they have to sit on the ground, which may be dirt, rock, have lots of sticks and rocks, etc etc (hey, it's ground, after all), plus they have to be light enough to carry if you are backpacking. Only tent I have ever had that had a pretty sturdy floor was the VW tent a guy here on Trailspace bought from me a few years back when we got rid of our last Kampwagen (this was the tent that fastened to the side of the Kampwagen with a rubber strip that clamped on the rain gutter - remember when cars and vans had those?). The floor was a heavy-duty coated fabric that stood up amazingly well to people walking into it in dirty boots and setting up chairs and tables inside. But the tent weighed something close to 40 pounds (er, 20 kilos, since it was German, hence metric).
Thing is, you often don't have a lot of choice where you are setting the tent up. By LNT guidelines, you don't want to set up the tent in a soft grassy meadow, so usually you have rocks, sticks, uneven ground, etc, maybe setting up on a rock surface, but sometimes on snow or ice. The floors of expedition tents do stand up pretty well on snow surfaces.
Hence, you need something to add protection for the tent floor if you want to prolong the tent's life. Used to be the fly was the first to go, due to UV deterioration. But polyester flies have extended the life of the upper part of the tent by quite a bit. So to extend the floor life, you need a floor protector of some sort - tarp or footprint. The big problem with custom-made footprints from the tent's manufacturer is that they are horrendously expensive (back to the microscopic budget problem!), plus they really don't last all that long and add to tent setup time (a real pain in that sudden thunderstorm or blizzard). The solution is to make your own footprint out of cheap but strong material. I have been using the polyethylene painter's dropcloths for many years now - about $3 to $5 or less for a 9x12, 3 or 4 mil sheet. I split it in half to fit my tents, but I am too lazy to cut it to shape (just tuck the corners under the tent. One section lasts 30 or 40 camping nights and weighs just a few ounces. Some people scrounge Tyvek from construction sites (there is often excess there which the contractors are throwing away). I have found, though, that Tyvek lets water through when it is under pressure (as in, your body weight sitting or sleeping on it).
Another alternative is to get a floorless tent (tarp, BD's Megamid or ID's equivalent, etc) and use the drop cloth for the floor. Such tents are lighter and more spacious, but do let bugs in, unless you get the bug inserts, and then the weight is back up.
Airflow through the tent - I once took a small battery powered fan - too heavy for backpacking, actually, and didn't move enough air. For 3 season, some of the current fashion in mesh tents do ventilate pretty well even under a fly. But it really depends on the climate. I have been on staff several times at the Boy Scout National Jamboree in Virginia, and used a fairly high flow fan blowing directly on me - you just can't beat the 90/90 weather - the fan doesn't help the 90% humidity, so you sleep drenched in sweat. So, no real solution. You just have to "sweat it out". Sleeping completely outside the sleeping bag helps some. Adjusting the zippers and having the fly a bit above the ground helps. Roof vents, such as the Bibler and Integral Designs tents have helps some. But, sorry, true air conditioning units are still way too heavy. But then, a genuine macho backpacker toughs it out.
One thing, though, the amount of condensation is dependent on the ratio of sweaty bodies to tent volume - that light-weight, tiny tent with 2 or 3 people in it will condense more than a big family-sized tent (sweat in the tiny tent or sweat under the heavy load of the huge tent - take your choice). Or, just toss the sleeping bag out on the ground and forget about the tent.