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Leaky Tent

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PostedAug 27, 2014 at 1:02 pm

So, I've had a Big Agnes 3p for 5 years now. It gets moderate use for not-terribly-weight-conscious canoe/bike/car-camping trips and the occasional 3-person backpacking trips. I don't use a footprint, but I do make sure my sites are pretty tent-friendly (grass/dirt/pine beds). Though I haven't had any problems in the past, the last backpacking trip I took the tent on had one long night of pretty heavy rain, and the tent collected an inch or two of standing water by morning.

We were at full capacity for the evening, so the bathtub floor was stretched out as far as it would go. The fly was taut, but we started having water leak in through the side of the bathtub floor – a couple inches off the ground. (The floor itself was dry to start, the mesh above the floor wasn't in contact with the fly, and we didn't really have a condensation problem inside the fly until early the next morning.) As soon as we noticed that water was beading through the side of the bathtub floor, we guyed out the bottom of the fly to get it as far away from the tent as possible. Water continued dripping in through the side of the bathtub and gathered along the floor of the tent and on all the clothes/sleeping bags that touched the wall of the tent.

This was our last night out (and a warm summer weekend), so we weren't screwed, but I'm now nervous about taking the tent out for more trips. Initially, I figured this was human error, but after we readjusted the fly, there was still a major problem. Any of ya'll have any insight as to what the problem might be? Is the tent just getting past it's usable life? Would those waterproofing sprays fix the problem? Am I just really, really bad at setting my tent up? (If it makes a difference, I've never had a similar problem in any of my other tents – including a 2-person double wall that gets more use and is going on 9 years now.)

Sorry for the length, thanks for your help!

PostedAug 27, 2014 at 1:23 pm

If you have already seam sealed all your floor's seams, including the corners then I suggest:

1. Re-seal the seams on both sides.

2. Look for pinholes in the floor fabric as leak sites and seal them on both sides.

If all this fails and it is a silnylon floor, then coat the entire floor with a 5:1 ratio by volume of (respectively) odorless mineral sports and clear GE silicone caulk.

Mix by shaking in a large lidded jar and apply with a small, short nap roller. Then be SURE to lightly wipe off excess with a blue paper "shop towel". Let dry in the sun.

Roger Caffin BPL Member
PostedAug 27, 2014 at 4:01 pm

> we started having water leak in through the side of the bathtub floor – a couple inches
> off the ground.

Ah, but where was the water coming from?

If the beads of water were forming 2" above the ground, then I have to ask whether the water level outside the bathtub floor was that high? Yes, I have had my tent floating in an inch or two of water just once – it was an interesting and very memorable experience. But since you don't make any mention of floating, I suspect that this was not happening to you.

If I am right, then the water could not have been coming through the bathtub wall. There was no water on the outside to come from – certainly no water pressure.

Two possibilities remain. The first is that water was condensing on the mesh inner and running down to the bathtub fabric. I would think that you would see this happening. The second is that the water was condensation from inside the tent. Yes, I know that you did not really have this problem with the fly, but that is OK. You see, the warm air from your bodies would be warming the inside of the fly just a tiny bit, while the cold air at ground level would be chilling the bathtub walls.

The interesting thing here is that you can have an almost dry fly and a wet bathtub with not more than one or two degrees of temperature difference. You were hovering right at the borderline – the dew point. This happens only rarely, but it can happen.

What to do when it happens? Um. Try to drain the bathtub floor out one end?

Cheers

M B BPL Member
PostedAug 28, 2014 at 4:39 pm

"Collected an inch or two of standing water by morning"

That would be a horrendous leak, unless you are referring only to a low lying corner or something.

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