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4 Answers

Curious exceptions to the rigid foam thermal barrier

I've noticed that it is common practice for rigid foam to be used on attic hatches and garage doors without being covered by a thermal barrier, which building codes require. Is there some implicit exception for doors/hatches? Or does the small amount of foam used cause it to be simply overlooked?

In Building Code Questions | Asked By Nick Welch | Dec 11 14
5 Answers

No local builders are bulding with GBA and BSC knowledge

The building code officials here mandate

fiberglass insulation in studded walls in basements covered with poly.

Energy Star, our national government advocates R-5 rigid foam on exteriors from zone 5-8. GBA and BSC say that is asking for trouble and should never be done!!

In Energy efficiency and durability | Asked By aj builder, Upstate NY Zone 6a | Dec 11 14
18 Answers

What to heat with in small duplex development

Hello, I am in final design stages of a small development on Vancouver Island Canada. It is 13 duplexes consisting of 850 sq.ft each on one level on a heated crawl space. They will be very tightly sealed and insulated. I want to reduce electrical needs to site to a minimum. I have natural gas so plan to use it for heat, cook, dryer, hot water. I am thinking of using the Ranaii direct vent heaters for main heat and tankless hot water. I may need or want to add a small ERV for added air movement and exchange.

In Energy efficiency and durability | Asked By MURRAY bANTING | Dec 3 14
2 Answers

Are there professionals who do site visits and advise on available upgrades and challenges?

I live in a house that is well over a century old and an unmitigated energy efficiency disaster (i just discovered an new conundrum recently). I've been doing some upgrades and asked a few questions (thanks GBA experts for your answers over the last few months), but there are issues that i am not sure how to address (for example how safe is it to dig out my very shallow crawlspace, is the dirt holding up the brick walls) and hopefully someone with a lot more knowledge then i have who might see issues i have not considered or know of solutions i have not discovered yet.

In Energy efficiency and durability | Asked By Alan B | Dec 11 14
1 Answer

Flitch Hydronic redesign thread

Flitch we need pics and pipe sizes and run lengths and details on what items are on the loops.

I have to put your pet bear here too cause I like the look of that furry animal.

In Mechanicals | Asked By aj builder, Upstate NY Zone 6a | Dec 11 14
4 Answers

New stucco over foam: cementitious or synthetic color coat?

My New Mexico house is getting a whole new stucco job and the new stucco is over 1.5 inches of EPS insulation, making the wall sandwich look like this outside to in:

Cementitious stucco w/ metal lath
1.5" unfaced EPS foam
0.25" cementitious stucco
Latex paint (ugh)
0.75" cementitious stucco
Single layer of tar paper
Celotex sheathing
2x4 stud wall insulated with faced mineral wool batts
Drywall
Latex paint

In Energy efficiency and durability | Asked By Nathaniel G | Dec 9 14
4 Answers

Need advice on outside insulation under new vinyl siding

Hi, intending to re-side house with vinyl. 2x4 walls w/plastic under sheetrock and batt fiberglass in walls. Plywood sheathing on exterior. Worried about leaks and trapping moisture. High wind/rain (coastal) area, zone 5 (CT). After stripping existing failing siding, plan to Tyvek house and flash well. Current siding provides R4 (plastic coated fiberglass impregnated foam - looks like board and baton from 1980). Thinking of using Progressive Foam's expandable polystyrene product called Neopor. 1" with R4 and high water vapor permeability.

In General questions | Asked By george baloga | Dec 10 14
4 Answers

Hot basement

I have just moved into a home with a wood burning furnace hooked up to the NG furnace and duct work. When I run the wood furnace (wf) the basement gets really warm. Should I cut a register into the cold air trunk? Thank in advance for any suggestions.

In Mechanicals | Asked By Dennis Krawchuk | Dec 10 14
8 Answers

Mini Splits winning the battle; with PV as a source let's even call it green.

Mini splits with PV are a great option even if not super insulated yet.

Pellet stoves do well, cost as much as a mini split and you have to attend to them.

Oil seems outdated and expensive and smells in old systems and very expensive to install.

Solar thermal there are a few that feel they can justify this, not all.

LP is never going to be as inexpensive as NG, NG is a good value for now, and maybe half a century more, depends on if we start really selling our frack fuel to Europe, which I doubt for now as they have Russia and Russia needs the sales Putin threats or no threats.

In Mechanicals | Asked By aj builder, Upstate NY Zone 6a | Dec 11 14
9 Answers

Cheap thermal imaging camera

It appears that a startup company called Seek Thermal recently has been offering a $199 thermal imaging camera that attaches to Android or IOS smartphones. What little specifications there are look impressive, for example:

  • Reasonably high resolution, 206x156
  • -40C to 330C range
  • Automatic calibration
  • Nearly 10 frames/sec video
In Green products and materials | Asked By Aaron Birkland | Dec 10 14
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