Q&A: A Forum for Green Building Experts and Beginners

Q & A Instructions

[Click map to enlarge]

The GBAGreenBuildingAdvisor.com web site has a wealth of articles on a wide variety of construction topics. Before posting your question, you may want to check out the articles on this page: How To Do Everything. You just might discover an article there that provides the information you seek.

Please register for a free account or sign in to ask and answer green building questions.

If you want to post a question, the usual rules of courtesy apply:
1. Be nice.
2. If you can't be nice, be polite.
3. If you can't be nice or polite — well, please be brief.

To attach a photo or illustration: Under the box labeled “More explanation,” look for the words “File attachments.” Click that, and you should be able to attach a photo.

Thanks for joining the conversation!

1 Answer

Can the stack effect pull significant radon to the main floor?

I'm not sure what my radon levels are with a dirt crawlspace and about 15ACH50, but i am curious if they are high can it end up upstairs in concentrations that are problematic?
I plan on testing it to find out and poly the crawlspace someday but just curious

In General questions | Asked By Alan B | Feb 9 15
6 Answers

Minisplit wiring and refrigerant lines

How can I camouflage these lines The mini split is dead center between two picture windows on the main floor on the front of the house .I have 5 inches of foam and the original plan was to clear a 3 inch by 2 inch channel on the outside of the foam to house the lines. The code says the refrigerant lines have to be accessible ,so we cannot do that .The siding is horizontal on the house so we do not want to see this 8 foot vertical lineset .The line will follow the bottom of the siding and the disappear under a deck. How have others disguised it ?

In General questions | Asked By bob holodinsky | Feb 6 15
7 Answers

Need help choosing an efficient HRV air exchanger

Need help choosing an efficient HRV Air Exchanger


My house as a total area of 2300 square feet (1150*x). We only have 1 stale air duct and 1 fresh air duct. I live in New Brunswick, Canada. Very close to Maine. So we could say that I'm in Climate Zone 7A.

In Energy efficiency and durability | Asked By Jim Lafleur | Feb 5 15
4 Answers

Are stainless steel metal finishes for plumbing fixtures more sustainable than polished chrome?

We are trying to ascertain the environmental benefits or hazards in selecting stainless steel finishes or polished chrome finishes for our plumbing fixtures for our clients. Any insights will be appreciated.

In Green products and materials | Asked By Paul Gleicher | Feb 4 15
5 Answers

Are Canadian and European triple glazed windows really worth the price premium over Intergity triple-glazed?

At 1 1/2 to 2 times the cost-or more, are the these windows really justifiable vs the Integrity fiberglass line?

In Green products and materials | Asked By JAMES KREYLING | Feb 8 15
3 Answers

Ventilate or apply more insulation to roof containing furnace and AC?

We have a 2 story Cape with a single air handler running off a heat pump, (down to 35) & a condensing furnace (For colder days). The heat pump is also our AC unit.
The bulk of the units are in the attic with only the heat pump/ac condenser out side.
We have a roof and wall sealed and unvented attic. There is no insulation under the floorboards.

In Green building techniques | Asked By Thom Cadley | Feb 8 15
29 Answers

I have narrowed my search for fiberglass triple-glazed windows to Fibertec and Thermotech — seeking comments about these two

I am building an Energy Star certified home with fiberglass, triple glazed, low e casement windows and slider/patio doors in Connecticut. I prefer using a Canadian company because of their expertise with fiberglass, triple glazed windows and sliders. I must have window specifications for the Energy Star certification, preferably NFRC ratings or at least independent U, SHGC and VT value ratings. Window ratings do not seem to be diificult to acquire but slider/patio door ratings can not be provided by some manufactures for fiberglass triple glazed sliders and French doors.

In Energy efficiency and durability | Asked By JOSEPH POLAND | Jan 15 13
3 Answers

EPS/XPS or ??? on interior side of cathedral roof in zone 7

I have a vented R40 cathedral ceiling (parallel scissor truss). It currently has two layers of R20 fiberglass batt insulation above the drywall. I would like to add some insulation; the only option is to add it to the interior..
Can I do this and if so how much EPS/or XPS or ??? can I add? I have room to add 6 inches of rigid foam or similar.

In Energy efficiency and durability | Asked By tim brown | Feb 7 15
2 Answers

What is the vapour permeance of plaster and lath?

I live in an older house with plaster/lath.plaster/1-2inch barnboard, 2x4, wood siding/vinyl siding, i am wondering what the permeance is of the interior side.

In Energy efficiency and durability | Asked By Alan B | Feb 7 15
1 Answer

EIFS over lap siding

i have a 2 story built in 1920. It has no moisture issues. I am having the exterior walls dense packed with cellulose. The exterior is horizontal lapped siding over 1x6 horizontal sheathing. After dense packing... can I apply EFIS using house wrap and 2" foam board over the lapped siding? ..or must it be removed down to the sheathing?

In Green building techniques | Asked By Todd Phillips | Feb 7 15
Register for a free account and join the conversation

Get a free account and join the conversation!
Become a GBA PRO!