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Old 07-07-2017, 03:33 PM   #16
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Re: After foam board insulation completed question.


I would supply fire air for the boiler as required and at the other end of the basement add a bathroom exhaust fan controlled by a humidistat. That will control moisture and help move warm air from the area of the boiler. The dryer will use the same air as the fire air.
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Old 07-07-2017, 04:55 PM   #17
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Re: After foam board insulation completed question.


Sorry I don't have the numbers it was w years ago they did the energy audit. Do what can I do just leave the window open there's really no humidity down there any more.

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Old 07-07-2017, 06:16 PM   #18
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Re: After foam board insulation completed question.


The energy auditor that tested will have those numbers if you can reach him. Without them you will have to judge and trust me. From experience, not just mine, unless a house was built right from the start to be very tight it is at best average and at best can be improved only slightly after initial construction. The measures needed to get well below the one air change every 3 hours just can't be done once the house is up. That's not bad it just means you don't need to be venting more air into or out of the house, exception is combustion air which as I said has its own guidelines.

If you need to exchange the air down there install a small fan to blow conditioned air from above down and provide a vent to allow some to return upstairs. This will work for summer and winter.

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Old 07-10-2017, 08:16 AM   #19
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Re: After foam board insulation completed question.


Hello here are the results of the door blower test.

Your building Shell Leakage was determined to be 1692 cfm50.

Current industry standards indicate that your Building Air

Tightness Limit is 855 cfm50.

Shell Leakage indicates how much air is leaking into your home.


If a Blower Door test was performed, the leakage was calculated

from measurements taken during this test. If no test was

performed, the leakage was estimated based on your building

volume and the age and overall condition of your home.

The Building Air Tightness limit indicates how much air should be

leaking so you have fresh air even when the windows and doors

are closed.

Given that your leakage is 98% greater than the limit, it is

recommended that airsealing be performed to improved the

comfort of your home and reduce unnecessary leakage.


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Old 07-10-2017, 09:03 AM   #20
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Re: After foam board insulation completed question.


How much air sealing has been done since that blower door test?

Even when you get down to their "industry standards" you are still replacing all inside air (on average) every three hours and standard air sealing rarely gets you there.

Your problem is not fresh air for the house but exchanging air from the basement with the rest of the house since conditioned air will meet your summer and winter needs.

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Old 07-10-2017, 09:30 AM   #21
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Re: After foam board insulation completed question.


Attic bsmt the whole house they took pcs of siding off and drilled holes and sprayed all in side the walls of the house to basically the whole house on the walls

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Old 07-11-2017, 06:07 AM   #22
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Re: After foam board insulation completed question.


Hello bud
Basically u are saying that I need to exchange air within my house and not being it inside from the outside and exhaust the hot air out. So how can I exchange or circulate the air through the bsmt and the first floor being that I have a ranch house.

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Old 07-11-2017, 07:05 AM   #23
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Re: After foam board insulation completed question.


Circulating air from the basement to the ranch above can be as simple as a bath fan blowing air from basement to a grill in the wall upstairs or some added ducts as part of the air conditioning system.

Does the house currently have any air ducts?

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Old 07-11-2017, 07:54 AM   #24
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Re: After foam board insulation completed question.


No ducts at all. Main area has wall a.c.
Wanted to get mini split but that's another time.


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Old 07-11-2017, 08:08 AM   #25
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Re: After foam board insulation completed question.


Your home may not be super tight but far tighter than homes were 30 years ago. Modern construction and energy efficiency measures have created homes that are too tight, thus that reference to the industry standard for targeted air leakage, they try to stop air sealing at that point. Along with modern tighter homes comes the need for ventilation, air circulation, and combustion air and you can throw in radon mitigation and indoor air quality in general. That said, adding a modest network of air ducts and a circulation system is just part of modern construction, even an HRV if it were in the budget.

Difficult for me from long distance to put together a full list of options but done right it could reduce your energy costs and improve your comfort. Locally I would suggest you search for someone promoting IAQ (indoor air quality) and talk to them to see what they can suggest while seeing first hand what you have. Most states will have an air quality group and perhaps can direct you.

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Old 07-11-2017, 09:02 AM   #26
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Re: After foam board insulation completed question.


Hello so I would need something like this with it pulling air from the bsmt through a duct system also connecting it to a cutout in the first floor then xspell out in the attic? So basically not bringing air from out side just pulling air through the house and expelling it?



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Old 07-11-2017, 09:24 AM   #27
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Re: After foam board insulation completed question.


When you expell air into the attic or out of the house anywhere that air MUST be replaced and does so by leaking in everywhere it can. Circulating air between basement and upstairs means blowing air from basement to upstairs and providing an opening where the same amount of air can come back down.

I don't recall the size of your house but for every 1,000 ft at 8' high you would have 8,000 cubic feet of volume. If you have 2,000 ft that would be 16,000 cubic feet. The fan you listed would move all of the air in a 2,000 ft house in less than 3 minutes, about 10 times faster than what you need.

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Old 07-11-2017, 11:18 AM   #28
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Re: After foam board insulation completed question.


Hey bud I believe this is the sqft of our house.



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Old 07-11-2017, 11:19 AM   #29
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Re: After foam board insulation completed question.


So how much of a unit would I need?

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Old 07-11-2017, 12:35 PM   #30
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Re: After foam board insulation completed question.


Most circulating fans I see offered are intended to exchange heating or cooling during those seasons, but all you need is a trickle of air flow, preferably from upstairs to downstairs. The fan that comes to my mind first would be a Radon fan because they are designed to run 24/7 for many years. Installed downstairs it could pull air from a vent anywhere you want upstairs and discharge it into the basement. This unit is rated at 137 cfm. http://www.supplyhouse.com/Fantech-F...yABEgJFk_D_BwE

At 137 cfm it would move the entire volume of upstairs or basement air every hour. That is 24 air changes per day. You could easily add a timer if you wish to cycle it for less air movement.

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