Horrible smell in house only at night. Help me figure it out.

[Anonymous]

Anonymous wrote:We had a dry p trap in the drain under our washing machine, and every night at 8 ish my kids would shower and the exhaust in the bathroom would create the negative pressure and the smell would emanate. Super annoying bc that drain is hard to access due to the pan under the machine, but we got a tube that I now keep in the drain that I can funnel water through.

It's likely a dry trap, OP. Run water through all the ones you don't use regularly, and put a little water in your basement drainage pump as well if you have one.

[Anonymous]

The most common source of bad smells in a house is sewer gas. Sometimes there is a leak but it requires the right combination of conditions for it to come in the house.

One way to check is to pour peppermint oil down your drains and see if you can smell it afterwards. Sending it down with very hot water helps to make it spread more aggressively. It's best if you have two people, one to pour the oil down the drain and one who waits outside until it's all poured and then goes around sniffing for it. Your nose will be more sensitive if you haven't already been exposed to it.

If you detect a leak, fixing it is a routine job for a plumber. You should fix it, sewer gas can be dangerous.

[Anonymous]

Anonymous wrote:We had a dry p trap in the drain under our washing machine, and every night at 8 ish my kids would shower and the exhaust in the bathroom would create the negative pressure and the smell would emanate. Super annoying bc that drain is hard to access due to the pan under the machine, but we got a tube that I now keep in the drain that I can funnel water through.

Filling the trap with mineral oil will keep it from drying out.

[Anonymous]

Demonic presence

[Anonymous]

Anonymous wrote:

Anonymous wrote:We had a dry p trap in the drain under our washing machine, and every night at 8 ish my kids would shower and the exhaust in the bathroom would create the negative pressure and the smell would emanate. Super annoying bc that drain is hard to access due to the pan under the machine, but we got a tube that I now keep in the drain that I can funnel water through.

Filling the trap with mineral oil will keep it from drying out.

That's for unused traps, not on affected by a vacuum.

[Anonymous]

In our case, our contractor forgot to cap one of the pipes behind the bathroom sink. Every time the toilet flushed, there was a blast of sewer gas.

If you've recently renovated, consider something like that. But again, you need to figure out why it happens with such timely predictability.

[Anonymous]

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:We had a dry p trap in the drain under our washing machine, and every night at 8 ish my kids would shower and the exhaust in the bathroom would create the negative pressure and the smell would emanate. Super annoying bc that drain is hard to access due to the pan under the machine, but we got a tube that I now keep in the drain that I can funnel water through.

Filling the trap with mineral oil will keep it from drying out.

That's for unused traps, not on affected by a vacuum.

If there's a vacuum in your drains they're not vented properly.

[Anonymous]

Anonymous wrote:In our case, our contractor forgot to cap one of the pipes behind the bathroom sink. Every time the toilet flushed, there was a blast of sewer gas.

If you've recently renovated, consider something like that. But again, you need to figure out why it happens with such timely predictability.

My vote is dishwasher running.

[Anonymous]

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:We had a dry p trap in the drain under our washing machine, and every night at 8 ish my kids would shower and the exhaust in the bathroom would create the negative pressure and the smell would emanate. Super annoying bc that drain is hard to access due to the pan under the machine, but we got a tube that I now keep in the drain that I can funnel water through.

Filling the trap with mineral oil will keep it from drying out.

That's for unused traps, not on affected by a vacuum.

If there's a vacuum in your drains they're not vented properly.

That is only one cause for a vacuum.

[Anonymous]

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:We had a dry p trap in the drain under our washing machine, and every night at 8 ish my kids would shower and the exhaust in the bathroom would create the negative pressure and the smell would emanate. Super annoying bc that drain is hard to access due to the pan under the machine, but we got a tube that I now keep in the drain that I can funnel water through.

Filling the trap with mineral oil will keep it from drying out.

That's for unused traps, not on affected by a vacuum.

If there's a vacuum in your drains they're not vented properly.

That is only one cause for a vacuum.

The entire purpose of vents is to prevent vacuums from forming in the drains.

[Anonymous]

Anonymous wrote:Demonic presence

more like demonic flatulence

[Anonymous]

Anonymous wrote:Sounds like sewer gas coming out of sink drains?

Yes. Maybe have a plumber check the new bathroom drains to make sure that the proper S drains have been used.

[Anonymous]

Anonymous wrote:

Anonymous wrote:Sounds like sewer gas coming out of sink drains?

Yes. Maybe have a plumber check the new bathroom drains to make sure that the proper S drains have been used.

S-traps haven't been legal for decades. You want P-traps.

[Anonymous]

Stack gas.