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10 Answers

Need to replace clothes dryer - what technology?

My wife informs me that our electric clothes dryer is nearly kaput. Should I replace it with the same kind?... as I understand the technology hasn't changed in years. I also hear of newfangled tech like condensing (ductless) dryers, heat pump dryers, and of course gas dryers.

What is a efficiency / cost savings / payback period of these alternatives? We live in New Hampshire, so heating-dominant climate. Electricity costs me $0.17/kWh, propane is currently going for $1.90. Would probably cost $200 to bring a line over to that side of the basement.

Asked By Tyler Davis | Apr 21 18
4 Answers

ECO Insulating Glass

Does anybody know anything about ECO Insulating Glass or had experience with their product?

Asked By Lucas Durand | May 1 10
1 Answer

Are solar panels today carbon footprint break-even during (and after) lifetime?

I know this is ever changing, and big effort is being made to find new ways to produce PV panels from cheaper/more environmentally friendly materials, but if I were to buy PV panels today, will they ever reach carbon footprint break-even point, when we take into account their production AND waste management?

On some soruces, I've found that getting rid of these panels is a big problem, because of the toxic materials used. How big a problem is this?

Asked By Davor Radman | Apr 19 18
11 Answers

Comfort Board 80 vs 110 - density worth extra cost?

For our upcoming house build using 4" of rigid mineral wool we have been quoted for both Roxul comfort board 80 and 110. Over the top of this we will install 2x4 furring and cedar siding.

The 110 has a compressive strength of 1120 PSF at 10% deflection, the 80 is only 439 PSF at 10%, using the 110 will simplify the installation of furring as it will compress less, but I don’t know that the furring installation sub would price their install any differently between the two products. (Furring install not by insulation contractor).

Asked By Chris Armstrong | Nov 16 16
28 Answers

Are low-e windows dangerous?

I've read a couple of articles that suggest low-e windows can cause fires. It sounds like the low-e coating (or a film, the articles weren't clear) is capable of reflecting and focusing sunlight in a way that can cause materials outside the house to combust. Does anyone have an explanation for what is going on with these windows?

Asked By Steve Knapp CZ 3A Georgia | Apr 1 18
14 Answers

Dense-packed dry cellulose: any downsides?

I've been going over insulation techniques to use on a new home. Every insulation contractor that we've talked to has a different system. One in particular that is being pushed is dense pack dry cellulose. I have personally witnessed wet cellulose settling in our own home, however based on everything I have read about and heard about dense pack is that it will not settle and that our current home's insulation was not installed properly. I know that cellulose is somewhat springy so I understand the theory is it will hold true in the wall for hopefully many many years.

Asked By Css1813 | Apr 16 18
3 Answers

Performance of polyiso exterior foam at cold temperatures

I've been meaning to post this ever since you helped me out with this question:

One of the last comments by Dana was that in my analysis I should de-rate the foam (especially if it is reclaimed)

"But for unknown goods don't count on it for being better than mid-5s from a design point of view."

Asked By Steve Mackay | Apr 17 18
16 Answers

Recommended European Tilt Turn Options with Thinnest Site Line

We had originally specced our project with Yaro UPVC but were considering options with smaller frames and similar high performance windows. One option is the Tanner Vitra.

The Vitra frame is 3.3” while the Yaro frame (currently specified product) is 4.6”. A difference of 1.3” in frame width. This equates to 2.6” more glass in both height and width (2 x frame dim.). This narrower frame will significantly change the feeling of openness one gets from a window of equal size. Of course the Vitra is more expensive and we're estimating about 45% more. Performance-wise they're very similar.

Asked By J M | Apr 7 18
12 Answers

Sliding Glass Patio Door - Leakage Rate?

Climate zone 6A and doing a pretty good home with a target leakage rate of less than 1.5ACH50. I'm just starting to look at windows so I'm not fully up on the technical specifications yet.

Asked By Steve Mackay | Apr 13 18
5 Answers

Least evil of my wall system options

Border of Zone 4/5. I've read much of the material on this website about wall systems. While I have my desires for advanced framing techniques, including 2x6 24OC and thick foamboard outside insulation, these things aren't a realistic option with builders/subs in my area undergoing a building boom.

The path of least resistance is 2x4 or 2x6 16OC. The only other builder/framer reluctant possibility is Zip-R with built-in polyiso. My city uses the 2012 IECC, but has amended the walls from R20 or R13+5 down to R13. Yes, you read right, here in 2018, the Zone 4/5 wall code is R13.

Asked By Bruce Davis | Apr 11 18
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