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1 Answer

I considering adding a radiant foil barrier on top of the the blown insulation.
What are potential problems could I have, as a result of this installation? Moisture problems? Our home is in Northfield, MN 55057

Asked By gary schutte | Aug 27 14
1 Answer

I have a question about cladding. I’ve always liked brick, but it’s easy to screw up and moisture management and insulation questions abound. So, I’ve been thinking about fiber cement siding with a rain screen. However, it appears that it’s difficult to put rain screen strapping on over exterior insulation without having bowing, and this tends to telegraph through to the cladding. This leads me to ask about mortarless bricks like Novabrik. If you don’t have mortar and do have a rain screen gap, don’t most of the moisture and insulation issues with brick veneers go away?

Asked By andrew c | Aug 27 14
10 Answers

I would like to ask the math pros here on how to calculate heat loss from infiltration rates.

I have seen so many different formulas in the last weeks that my head is hurting.

So would like to have a "reliable" formula that could be used in my never-ending expanding excel spreadsheets !

Something with at least a little bit of proven precision, that could be used to effectively get additional heat loss using door blower results or planned target value.

Links or straight formula please :)

Asked By Jin Kazama | Aug 25 14
2 Answers

I am in the process of trying to determine how much strapping spacing is needed on a ceiling to support 22" of blown-in cellulose above it. The strapping is 1x4 pine and I plan on spacing 16" OC whixh makes the space between supports of 12". The strapping is holding 6 mil poly up against the bottom chord of the truss. There will be some ballooning of poly downward in those squares between truss and strapping. 5/8" Sheetrock will be used up against strapping to finish. Thanks in advance.

Asked By Matthew Michaud | Aug 26 14
13 Answers

I was speaking with my passive house consultant the other week, and she expressed concerns about boring critters and subsurface rigid insulation. She had such an experience with some insulation in her garden (It was put in one season and removed at a later time as she got back to completing the project.)
Now, I know all about the ate/termite protection used in these insulation products, but what about larger critters that would love to have a warm dry home?

Asked By Steve Young | Aug 16 14
8 Answers

I got a quote for windows from Intus and thought it the quote was high. But I do like the windows themselves.

A 24 x 48 fixed window was $385 with a simple grid pattern white - thats 48.13 sft
A 36 x 48 operable window was $745 white - thats $62.60 sqft faces west
and a 42 x 72 operable window white $1000.00 thats $47.62 faces west

I read somewhere on GBA blog that a typical Intus window was $30-35 sft fixed and $40-$45 operable, I have 34 windows and only 7 are operable and totals $28,000, is this reasonable or not???

Asked By Sam smith | Aug 26 14
33 Answers

Does anyone know if there are any companies that offer residential fuel cells on a lease program?

I met someone at RESNET this year who worked for a company that was offering such a program, but I have not been able to reach him since mid-March.

I'd like to utilize one to carry the electrical load on my future home.

Thanks for any help you can offer.

Asked By Mike Collignon | Jul 24 12
28 Answers

My house has high levels of CO2 / carbon dioxide, every room is between 1100 ppm to 1200 ppm according to an air quality test I had. There are only 2 grown occupants and it's a 1000 sq. ft. brick house. No pets or plants, gas stove / furnace / water heater.

The basement was the only area that had between 900-1,000 ppm of CO2. I've read ASHRAE likes to see under 1000 ppm of CO2. We do have headaches & drowsiness but aren't sure if it's strictly from CO2. For reference, our CO (carbon monoxide) numbers were all under 2 ppm.

Asked By Jeff Watson | Mar 9 14
4 Answers

I am in the final phase of completing my first PERSIST remodel.
We have installed (2) layers of reclaimed 2" polyiso on the walls (over TYVEK drainwrap) of a 1940's ranch and then strapped with 1x4's using headlock screws. Existing walls were in decent shape in terms of flatness and corners were within an 1/4" of plumb over 10'. So the walls were not perfect but they were pretty good, not bad enough to catch the eye.

Asked By Charles Chiampou | Aug 24 14
20 Answers

All this talk about ductless minisplits is making me dizzy. If a forced air furnace gives a bad atmosphere in a building, doesn't a minisplit per room just give many bad atmospheres?

Dana reminded me on another post that a forced air furnace increases infiltration/exfiltration. Well, why doesn't a minisplit heater or cooler do the same?

Asked By flitch plate | Aug 19 14
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