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Posted by Don Young on June 23, 2008, 10:40 pm
>I posted earlier, i still can't figure out how water is getting into my
> floorboards. The floorboards get wet at the cracks, as if water were
> seeping along the tongue and groove channels, in an area about 3' by
> 2', and it seems to be associated with rain, though I'm not sure of that.
> The floor is above ground level but not by very much.
>
> However, there's a staircase going down to the basement between the part
> of the floor that's getting wet and the outside wall! So it's hard
> for water couldn't be coming from the outside wall.
>
> There's an inside wall near that area, and the water heater vent runs up
> to the roof inside the wall. I thought maybe there's a roof leak near the
> water heater vent. But I just went up into the attic, right after a heavy
> thunderstorm, and felt around the vent, and everything is dry!
>
> Also the roof vent seems to have a quite adequate cap on it.
>
> So I just don't know. I can look up at the subflooring under that area
> and it isn't wet. The water heater vent is the only possible water source
> I can see near that area.
>
> Can water come up from the water heater somehow??? It's an old water
> heater, is it possible there might be a lot of condensation in there or
> something?
>
> I'm getting a digital camera, I guess I could post pictures. Of what I
> don't know.
>
> Any ideas?
>
> Laura
Condensation in water heater vent pipes is not unusual. It is more likely
when the air is cool and humid so it can be related to rainy conditions. The
pipe should slant so that the water drains back toward the heater. The
joints should be assembled so that water does not leak out. It is then
re-vaporized and carried out the vent once the heater flue and vent pipe
warm up good.
You could put some newspaper or paper towels under the vent pipe to see if
any water leaks out. Talcum powder sprinkled around will also show up any
water drips or seepage.
Don Young
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