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!


3 Answers

Can't fit polyiso boards through trusses even with folding.

I did one side of a bonus room okay with folding the polyiso boards various ways.

The other side I probably can't do because of the smaller hole available to me.

Is there any alternative besides housewrap?

Asked By John Sean | Aug 23 17
7 Answers

Thoughts on insulating a solid brick house in a cold climate

Hi everyone!

I've purchased an old brick house near Ottawa, Ontario (closing in September) to fix up for my mother with eyes open about the associated energy costs and upgrades factored in. I'm now trying to solidify my plans for the house, and wanted to get some input on insulating the exterior solid brick walls.

Asked By BrianV_ | Aug 23 17
3 Answers

Ductless Mini - Dehumidification Mode - Power usage?

On a Mitsubishi ductless mini split, when in dehumidification mode, how much power does it draw? Would it draw less or more power than when in cooling mode?

Asked By Peter L | Aug 20 17
4 Answers

Phased Construction-Two Electric Tankless Hot Water Heaters?

Climate Zone 3. Distribution water at tap temperature estimated to be 50-55 (finish water temp as it leaves the water plant). I'm phasing construction: Phase one: 1st floor shop/garage. One shower/one lavatory sink/one shop sink. Phase 2 is the upstairs living quarters that are estimated to be finished out within next 3-5 years. The electric service to the shop/home is 2/200 amp services. We are planning one panel for the 1st floor shop and one for the 2nd floor living quarters. ( I say living quarters..it turned into a 2000 square foot 3bd / 2bath space-basically a home!).

Asked By Inger Peters | Aug 23 17
21 Answers

3/12 pitch roof insulation

Hi all.
I sent a question and got a reply on a 2/12 pitch roof.

I have an architect working on my plans now. It is a single-slope roof at the widest part (of 32 or so feet).

I originally was going with 3/12 pitch, but he thought 2/12 would be a lower roof at the tall end, so I said fine!

Now, looking at the problems with 2/12, I asked to go back to the 3/12 pitch. So: If I go 3/12, would I (or should I) use R-60 fiberglass? It will have 24 in. parallel trusses.

Would I still need a cupola? (Zone 6, lower Michigan.)

This is TMI for my small brain...

Thanks,
Bob

Asked By Robertsoave | Aug 19 17
1 Answer

Where's the best place to purchase windows from?

I'm looking to replace multiple windows in our house, and I would like to tackle the job myself. I fairly handy, and am not shy about tackling projects in our house. I'm curious to see what where people suggest to buy windows from. From reviews I've read, everyone says to stay away from the big box stores, like Lowes and Home Depot, because they say the windows lack quality. A number of my windows are special order, and I get to pick out the glass and such, so it is really going to be an inferior product compared to something else out there?

Asked By Andrew Simpson | Aug 23 17
17 Answers

CLT + Wood Fiber + Cork Facade

I have been through the ringer here with these walls and have circled back to what seems to inadvertently simulate an actual tree buildup.

(Heartwood --> Trunk --> Sap --> Cambium --> Bark --> EXT) is replaced by (INT --> Cross LAminated Timber --> Air Barrier --> Wood Fiber --> Cork --> Ext).

The roof assembly is a bit different, replacing the cork with an air gap (is this necessary?) plus sheathing and either TPO or EPDM.

Asked By Ethan T ; Climate Zone 5A ; ~6000HDD | Aug 22 17
4 Answers

Electricians: Are copper main water lines still used for the main house ground?

I will be running my main water line under the footing very soon, and although I have selected Pexa for the main 550' run, I still have the option to connect it to a 12' piece of 1 1/2" copper pipe to make the through slab section/main ( I am just running a 3" abs pipe under the footing right now to allow connections at a later time)

Asked By Mai Tai | Aug 22 17
2 Answers

Thoughts on Legend HyperPure pipe

I've been looking for a "greener" pex alternative that does not leach and type of chemicals/taste into the water.

After doing some research last night, I learned about the pex alternative, Hyperpure, on this GBA article:
Making The Best Pex Connections

Asked By Grey Wolf | Aug 22 17
8 Answers

I would appreciate a review of an air-source heat pump quote

zone 7 Kenora Ontario, Canada.

I asked for a quote for an ASHP unit that would work for the time being as well as in the near future when the house is expanded...

Some background....

1-short term.. (with the building as is)

-to heat and cool my existing home, 850 sq ft 2x6 framed 20 yr old bungalow on conditioned 5 ft insulated crawlspace...

I completed an online manual J about a year ago and determined as best I could a heat load of about 25000 btu.

and...

Asked By Tim Brown | Aug 19 17
Register for a free account and join the conversation


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