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Ditto.

This is a very serious problem that you should not attempt fixing yourself. I am curious how you discovered it was back-drafting, I'm glad you can still write about it.

The Panasonic fans are what I usually recommend, quiet, efficient and actually move air. Coupled with a humidistat and properly sized it should do the job.

Yup, Its got me hook line and sinker now!

Been researching it more, looks like I got to find some curing salt and get the smoker out of winter hibernation.

Anyone here made their own bacon before? Got hold of a pork belly and am going to give it a try this weekend.

This is the recipe I"m going to use.


...

Good video and system but IMO some sealer [primer etc.] should have been applied to all that bare wood. Rot and warping are what I see kill wood windows.

I kind of expected they would find something more than that but it does sound reasonable. You could try a quick fix with some of that removable caulking, forget the exact name but it's like sticky...

taverty - That is correct, it should be closed but by opening and closing things with the BD running it can be enlightening to see if areas are going positive or negative. If they do it means there...

I just wanted to summarize a few key points made by myself and others before the next test. If I miss anyone’s feel free to add.

Explain to your auditor/rater the concerns you've expressed here....

The NPP can be found using the manometer from the blower door [or any that measures pa]. Just zero it outside then using a hose long enough to reach outside [sealed somhow] move up and down the...

Erla - I agree, but up to this point the blower door and duct-blaster say this place is super tight, which is so contrary to all the symptoms. Puzzling.

Just patiently waiting that next test now...

There certainly are many hidden places for leakage.

Taverty - when the next blower door does get done make sure you have plenty of time to search around with it running. I'll see if I kind find...

The N factor is a number from a chart based on your region, # of stories and shielding and is used in a formula to convert to ACHn [natural air changes] from CFM50. It's just another way to look at...

From one of the first posts,

sqfeet: 4523.84
Volume: 39743.90
CFMs @ 50: 2400

Airflow building: 231.84
Airflow people: 75
BAS at CFMnat: 231.84
BAS at CFM50: 3987.64

I forgot to ask, can you inspect that radon system piping to make sure it is all intact and not depressurizing the house?

Well, this is a challenging one.

You've done everything right and got all the data needed that should produce some answers but back to square one.

All the symptoms and high bills all lead to a...

I've been following this thread for a bit but haven't replied because I just didn't have enough time to type everything I wanted to say. At this point most of it has been covered but just wanted to...

Just another thought, you could probably just leave that door opened a little to equalize things a bit. Still don't see it as a winter problem but like TB said keep an eye on it this summer.

You most likely have nothing to worry about.

Relative humidity [RH] is relative to temperature. Hot air can hold more moisture than cold air, so the same amount of air and water will have lower...

Sorry to hear all you have been through, but I was trying to help.

I don't get the ... thing either and I don't think the OP ever confirmed the water heaters are electric but would guess ERLA's assumption is correct.
I've also come to the conclusion this is a total...

So where did the water come from the first time and what was done to correct it? Again, have you discussed this with your HVAC contractor?

A humidifier is another question that I think you said...

This is the part that is still raising my eyebrow, the OP states "when the heater kicks on, the humidity in the house shoots up all of a sudden"

Since he didn't provide the numbers I'll just guess...

Have you at least discussed this with your HVAC sub?

Since this is brand new what does your contractor think?

From what inside/outside temp and humidity are you raising the inside temp when the heat turns on? A sudden surge is not normal in my heating climate.