'The Footprint: Extending the Life of Your Tent
A footprint is a custom ground cloth designed to match the contours of your tent floor. A tent footprint simply helps protect the floor of the tent from abrasion. When you pitch your tent and then get in, your body weight and tossing and turning during the night can damage the fabric or abrade its protective waterproof coating as it comes in contact with the rough ground.
Let a footprint take the abuse instead. Footprints are constructed an inch or two smaller than the tent floor and sometimes have loops or hooks that attach to the tent stakes to achieve a custom fit that requires no tucking.
Footprints are usually sold as an accessory and may not be included in your tent package. If you can’t find a footprint that fits your tent, a laminated tarp or even a plastic tablecloth can be used instead. These are lightweight, easily-packed, and inexpensive.'
Taken from this web article page at link here.
Separate groundsheets may well allow better loadsharing when backpacking, and may too make it easier to pitch and strike a tent; but they provide much less protection against insects, wind blown grit and dirt etc. from getting into the sleeping area! Also, if any part of a separate groundsheet protudes even slightly from under the tent's side walls, then it just quickly provides a ready path for moisture to flow right through into the tent like a stream!
Maybe the groundsheet/footprint here in this case isn't wearing out at all, but water is just flowing in because the groundsheet is not excactly enough (as in above here given example) well fitted then?
True, a footprint can protect a tent's floor from damage. Keeps the bottom clean, and adds a waterproof layer; but it isn't just the actual material failure of said ground covering that could be at fault in this case perhaps. Maybe that tent just needs some good 'tlc' given to it by way of a re-application of seam sealer to its inner seams, paying special attention to the floor and rain fly. Self seam sealing will help keep moisture from both rain and dew outside. Some tents do come with factory-taped seams, some don't. Although the former offers much more protection than unsealed seams, these should still be self seam sealed for maximum effectiveness of waterproofness/weatherproofness yourself. ( To avoid 'binning' your product warranty you must be very sure to carefully follow both the tent manufacturer and seam sealer’s instructions though; and do definitely have adequate ventilation during the sealing process. Depending on how often you use your tent and the quality of your seam sealer, you may even need to repeat this user diy sealing process yearly.)
http://www.sierratradingpost.com/lp2/tent-guide.html#3 See here, about why many think you should indeed diy seam seal your tent seams yourself, even on a newly bought tent.
Edited: 15/06/2008 at 03:34