Community: General questions

[Click map to enlarge]

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

26 Answers

A year and 4 days ago, we moved into a brand new house. Installed already was a Venmar AVS air exchanger. Immediately we found that the house always felt cold. Being a newly constructed house, and our first winter in the house, we thought that we just needed to 'let the house warm up' and remove the humidity. We left the air exchanger on the setting that was recommended by the installer. We found that the house, and basement especially always felt cold. The windows constantly have condensation on them, and it is difficult to breathe.

Asked By C Wat | Jan 17 13
7 Answers

As seen in the attached photograph the new home (near Brockville, Ontario, Canada) is being built 100% on granite bedrock. The site slopes to the west . That is the right-hand side of the photograph. There are two drains (4" diameter) located on the footings on the west side.

The home will have a 4" concrete slab on 2" of rigid insulation (taped). This will sit on the fill. At the east and north sides of the homes, the fill will be perhaps 1 foot thick. At the west side, the fill will be perhaps 4 feet thick.

Asked By Wilder Boucaud | Nov 2 12
38 Answers

I checked out a building yesterday that had heating mats like this one installed in four areas. Obviously it's electrical resistance heat, and there's an attic above so there's doubtless some loss into the attic, but these definitely make you feel warm, because your head is so close to the heat source. There was 1260 watts of heating installed in this area, along with 576 watts of fluorescent tubes. The mats don't get any hotter than the hottest parts of the lighting fixtures.

Any comments on this type of heating?

Asked By David Meiland | Jan 31 12
9 Answers

I am in the Seattle area (climate Zone 4) and am going to be putting in an "addition" for a new utility room and I would like to double check the location of moisture control here's the setup:

Slab above grade is the garage floor, which is 1-3" below the top of the foundation walls. I plan on putting pressure treated scribed 2x12 floor joists down to 1) raise the level of the floor to the existing floor heigh in the rest of the house; and 2) allow for insulation to be put between the joist bays which would otherwise be open space.

Asked By Mateo K. | Jan 7 13
2 Answers

Good day,

Asked By Michael Genin | Jan 17 13
3 Answers

I have odd sized rafter, wall stud and floor joist bays and Larsen trusses to boot with no top plates. This poses a problem in calculating the quantity of cellulose I need to get the optimum R-value (assuming the best is 3.5 to 4.0 lbs/ft3) in my all season cottage.

Can anyone point me to a formula on-line that I can punch in my numbers and get the volume estimates for my different dimensions of cavities at different densities (R values)?

Asked By Oak Orchard | Jan 14 13
34 Answers

I am unsure that my windows perform as they should,
this is our second winter in the new house, and the first one we had to get rid of ridiculous humidity level caused by the building time.

Now humidity as set to 35-40% for now,
and i still see condensation at bottom of all windows on the first real cold night.
Yesterday was a ~ -15c and i've measured down to 0c at the bottom of the glazings.

What is supposed to be normal temps for inside pane of high eff. windows ?
Is there any test results or tables somewhere i could check ?

Asked By Jin Kazama | Nov 30 12
4 Answers

I've been reading a lot of articles and questions/answers from this site and many others in preparation for a re-siding project. I am located in South-East New Brunswick, Canada, our climate zones run different than the US, but I believe it would be similar to Bangor ME which is zone 6A.

To the best of my knowledge the wall construction (1977 build) is, from the outside in, vinyl siding, felt paper wrap, board sheathing, 2x4 walls, fiberglass batt insulation, 6mil poly VB, 1/2" drywall.

Asked By Scott Smith | Jan 9 13
4 Answers

What are peoples' preferred internet sites for obtaining
heating/cooling degree-day stats? I'm looking for a
place I can get any of day-by-day, monthly/yearly tables,
etc for fairly localized points. I will need to do this
programmatically, i.e. sites that depend on javascript or
other browser fluff won't do, and the data needs to be
available in a straightforward fashion without having to
install any special "apps" or plugins. Wunderground.com
allows looking up historical data for various airport-based
stations and isn't a bad start, but I don't necessarily want

Asked By Hobbit _ | Jan 15 13
Register for a free account and join the conversation


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