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11 Answers

U-factor difference between 0.2 and 0.3 on fiberglass windows

Hi everyone,

Appreciate the feedback on my Colorado fiberglass window question posted the other day. Here is the follow up question.

How much more energy efficient and comfortable will we get in Windows that have U-factors that are 0.2 rather than 0.3? All our window choices for our new build in Colorado at 7000 feet are fiberglass. Alpen windows have U values around 0.2 and the others Migard Ultra, Kolbe Forget, and Marvin Integrity are about 0.3 on average.

The Alpen are however 30 percent more dollars.

Worth the extra money?
Will we get more comfort with the better ?

In General questions | Asked By User-6990904 | Feb 24 18
20 Answers

Brick house insulation

All,
First of all, I wanted to wish everyone Happy and Prosperous New Year!
I would like to ask for an advice regarding a wall cavity composition. I am in Westchester County, 30 miles north of New York City, climate zone 4. I am about to acquire a brick house (tiny brick, maybe 2-3 inches thick). Single wythe, I believe. I think that brick is just decorative and is not load bearing at all. Only cinder blocks in the basement support the floor joists. Second floor ceiling joists are supported by wood framing.

In Green building techniques | Asked By Sebastian Smith | Dec 29 17
7 Answers

Decentralized ductless ventilation system: Zehnder, TwinFresh, or Lunos?

Hi,

Background...We are building a 2000 sq ft home at 7000 ft in Colorado, climate zone 6b, with about 7000 HDD. The house will be tight but we are NOT going for any certification. It is one story, 3 bed, 2.5 bath. My spouse has lots of allergies and is opposed to duct work. As we live with doors and windows open a fair amount of the year he is opposed to adding ductwork in the house for an HRV OR ERV. Whether that makes sense is NOT the question.

In General questions | Asked By User-6990904 | Feb 21 18
4 Answers

SIP panels

We are thinking about building are next house with SIPs walls but I have a few reservation. We are located in central NC where it seams is always humid. The house would be ~1800 sqft ranch with a simple rectangular design. Everything I have read about the panels seems great and the ability to get a air tight house with r-27 insulation quickly and easily is very attractive.They offer polyurethane with a few exterior options such as Zip and LP Smartside sheathing, the idea of having the siding already in place seems nice and would speed of the build.

In General questions | Asked By Ryan Cutright | Feb 24 18
16 Answers

Real estate appraiser doesn't care about energy efficiency

Recently had an appraisal done for a refinance loan. I have a four year-old 9 kWh solar system (provides near 100% of electricity); a one-year old top of the line Lennox Signature 98V furnace (98% efficiency, VSM, modulating burner) and a one-year old Lennox Elite 16 SEER AC.

In General questions | Asked By Bic2 | Feb 23 18
3 Answers

Will fiberglass insulation retain interior heat that a thermal barrier (foil) will not?

I have an unheated shed for gardening tools, equipment, and chemicals that has foil backed plywood walls and roof sheeting. I plan to install standard plywood to the interior walls. Summer temps average 90 to 100 degrees max so the thermal barrier of the foil should provide some insulating value to keep the interior somewhat cooler. I am concerned that winter temps that typically dip to the 20s but occasionally could dip lower, could cause something in the shed to freeze.

In Energy efficiency and durability | Asked By user-7026765 | Feb 23 18
23 Answers

Workshop heat pump

Hi everybody! I have a quick heat pump question, and hope somebody might have some insight, experience, or opinions to share in response.

We live in Nova Scotia, Canada, a mid-temperate climate zone with average temps of -8C during our coldest months (January/February) up to 23C in July/August.

In General questions | Asked By Benjamin Wooten | Jan 26 18
10 Answers

Fiberglass window choices for new build in Colorado

Hi everyone,

We are building a new home in Colorado, 7100 ft, south facing, energy efficient, single story. That is the short story. We are only considering fiberglass windows. The choices are Alpen 525, Marvin Integrity, Miguard Ultra and new to list Kolbe Forgent. In terms of energy efficiency: U, SHGC, VT the best is Alpen, made just outside of Denver, but no local vendor. The rest have local vendors for support.

In General questions | Asked By LYDIA SEGAL | Feb 19 18
8 Answers

Climate Zone 3C: Crawl space, roof, and wall systems review

I'm in the design phase of a remodel of an existing 2 story house, CZ3 coastal, zip code 95062. The scope includes a new foundation and gutting the house with some interior walls moving, but for the most part keeping the existing exterior shape and roof line. Goal is a high performing house (well insulated, air sealed, mechanically ventilated, high IAQ and minimal heating and cooling loads). I've attached a line drawing of the shell for reference.

In Green building techniques | Asked By Phil Boutelle | Jan 9 18
8 Answers

Wall, floor, and roof build layers

A little background.

Starting construction on a small house in Texas, west side of Houston,
Climate zone 2A - wet & humid
Conditioned living space is 1280 square feet
House is being built in a FLOOD WAY, Yes I said in a FLOOD WAY
We already have approval to do this, which has taken us quite some time to accomplish.

House will be elevated approximately 6' off the existing grade on concrete filled
fiberglass pipes with re-bar reinforcing inside. I have designed a steel collar, plate, &
C-channel attachment system that our engineer is comfortable with.

In General questions | Asked By von Leyser | Feb 23 18
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