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Old 07-07-2017, 08:15 AM   #1
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After foam board insulation completed question.


Hello all I'm almost done installing 1 1/2 thick foam board all around my bsmt walls. Before I did it the bsmt was so humid and moldy smelling. I had efflorrance fit no actually seeible water penetration. So not that it's almost done I feel the bsmt is now hot and Dense no humid feeling no musty smell I was wondering if I should install a air exchanger on one side of my bsmt rim joists to circulate air around? I have windows in the bsmt should I just leave them open constantly. Any information would be great.

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Old 07-07-2017, 09:34 AM   #2
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Re: After foam board insulation completed question.


There should be conditioned air circulation in the basement.

Are the rim joists sealed and insulated.
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Old 07-07-2017, 09:41 AM   #3
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Re: After foam board insulation completed question.


Yes they are all seald up.

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Old 07-07-2017, 09:45 AM   #4
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Re: After foam board insulation completed question.


Any ductwork in the basement? You just need some air circulation and conditioning at this point.

If the whole home (i.e. in total) is super tight, you may need to look at an HRV or ERV.
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Old 07-07-2017, 09:47 AM   #5
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Re: After foam board insulation completed question.


No ductwork just a oil tank washer dryer boiler and soon to be play area.

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Old 07-07-2017, 09:47 AM   #6
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Re: After foam board insulation completed question.


I was looking into a air exchanger unit

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Old 07-07-2017, 11:13 AM   #7
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Re: After foam board insulation completed question.


Once the basement is sealed and insulated it becomes part of the upstairs conditioned space and can benefit from sharing that air. Opening a window or venting outside air into the basement may introduce a lot of moisture from the humid air.

An HRV can exchange inside with outside air when needed but you haven't determined that need as yet. A blower door test is one method. But when not needed it says the house is already exchanging enough air.

Are you running ac upstairs and where are you located?

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Old 07-07-2017, 11:27 AM   #8
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Re: After foam board insulation completed question.


They did the door test last year for my energy audit. I'm Located in new York city. The a.c. is on all day on my upstairs main floor the bsmt is below level

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Old 07-07-2017, 11:28 AM   #9
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Re: After foam board insulation completed question.


Do you have air supply to replace what you and the dryer and the boiler are using.
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Old 07-07-2017, 11:44 AM   #10
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Re: After foam board insulation completed question.


No air supply coming in unless windows are open. Boiler uses are inside the bsmt

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Old 07-07-2017, 12:46 PM   #11
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Re: After foam board insulation completed question.


Quote:
Originally Posted by charles3526 View Post
No air supply coming in unless windows are open. Boiler uses are inside the bsmt

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We do rooms under the garage out here that end up being a concrete box with a door from the basement. They have a fresh vent and a bathroom exhaust that runs when the light is on. That usually gets closed off when the conditioning is added.

But the boiler or furnace needs air for the fire anyway.
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Old 07-07-2017, 01:09 PM   #12
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Re: After foam board insulation completed question.


Yeah so the air intake is just taking it from the air in the basement

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Old 07-07-2017, 01:20 PM   #13
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Re: After foam board insulation completed question.


So maybe I should get two exchangers if I'm gonna close off part of the basement and install each one on the side of the basement walls by the boiler and then in the other room?

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Old 07-07-2017, 02:11 PM   #14
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Re: After foam board insulation completed question.


This is what I was looking at buying


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Old 07-07-2017, 02:58 PM   #15
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Re: After foam board insulation completed question.


Do you have the blower door numbers, CFM50 or ACH. (cubic feet per minute at 50 Pascals) or (Air Changes Per Hour at 50 or natural)?

Those numbers will tell you whether fresh air is needed or not.

Example, a house at the borderline of needing additional fresh air will be exchanging all of the inside air with outside air every 3 hours. Even a reasonably tight home will be exchanging all of its air every 4 hours, so adding more is just a waste of energy. The unit you pictured just blows air with no attempt to recover the energy for what is being blown out.

Combustion air for your boiler has specific requirements in terms of vent size and location and the dual fan you pictured would not meet those requirements.

Do you get condensation on your windows in the winter. In a cold climate a tight house will have high indoor humidity and window condensation becomes an indicator. If not, the house does not need to exchange more air. Those blower door numbers will confirm.

The basement air does need to mix with the conditioned air from upstairs which is easy when you have a forced hot air system, but needs another solution with baseboard hot water heat.

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