Community: GBA Pro help

[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!

2 Answers

ERV for a basement apartment

We are renovating a 900 sq. foot basement apartment in Beacon, NY (Hudson Valley - area code 12508). It's partly below grade, and pretty tight with new double pane windows.

We're thinking of putting in an ERV for ventilation since:
1) We think that having the availability of ventilation in the basement apartment is a good thing.
2) We've noticed a slight mustiness in there.

Asked By Yaakov Weintraub | May 15 14
2 Answers

Daily attic air exchanges?

.. with a balanced attic ventilation system in place,

how many attic air exchanges daily should be expected?

Asked By Hans Mayer | May 5 14
4 Answers

Help — Critters in my windows

I don't know if this is a question you have ever seen before. Recently we decided to remove a window and close the wall up. It was not possible to remove the window intact without damaging the siding, so my husband cut the frame and removed it in pieces. The windows are typical vinyl single-hung windows. They seem like good energy-efficient, double pane windows and are newer.

Asked By L H | Apr 30 14
2 Answers

Roof SIPs - Zone 4B - (Is Joe Lstiburek in the house?)

When doing an OSB roof SIP with a polyurethane core in a Zone 4B climate. If one tapes the interior seams with a building tape and uses a peel & stick Butyl membrane on the exterior OSB.

Does one still need a "cold roof" above the roof SIP?

I am under the impression that with both seams (interior and exterior) are sealed with a vapor barrier (interior tape and exterior peel & stick), one can place a standing seam metal roof directly onto the Butyl membrane & roof SIP without needing a cold roof. My concern is of course the "SIP rot" issue.

Asked By Peter L | Apr 28 14
4 Answers

Usonian house restoration - sunroom window replacement (direct set double pane or single pane)


We are currently restoring a Usonian style house built in 1962 here in Northern Illinois. The sunroom is currently being restored to its original design with a few exceptions:

Asked By Ryland Bouchard | Apr 13 14
5 Answers

Cathedral celling insulation technique in a northern climate

I have seen a few discussions about insulating cathedral ceilings but none that relate to the method that I had in mind for my 24' cathedral here in Vermont.
* Penetrating water sealer on all surfaces that have the potential to rot.
* One inch strapping to create an air gap for ventilation.
* Multiple overlapping layers of ridged foam(open or closed cell?)
* All seams taped because expansion and contraction will break a DIY spray foam seal.

Asked By Gary Spurling | Apr 11 14
1 Answer

Seal a new slab for wood floors?


I just installed a new slab. Slab is approx 5" thick, and was set up as follows. We dug trenches and laid drain pipes in gravel, fabric wrapped, etc. On top of that another layer of crushed stone, 2" insulation and then a fully waterproof layer (Grace Pre-Pruf). On top of that poured the 5" slab.

Plan is to put down pressure treated sleepers, with t&g plywood on top and then put an engineered wood floor on top of that.

Asked By R W | Apr 11 14
3 Answers

Hot tub room in a 'heated garage'

Hi GBA Pros,

We just got a call from a client who wants to build a hot tub room in their garage.

My colleague sent me this email about it.

Asked By Chris West | Apr 9 14
9 Answers

Conditioned crawlspace and/or attic

If you need to build a home with a crawlspace because of the slope of the land and you also have an attic, what is the preferred place to put your furnace: in a conditioned crawlspace or a conditioned attic?

If you make a conditioned attic, how do you treat the space above a porch and the garage? There are obviously no ducts going to these places. Do you make them part of the envelope anyway OR you build walls to exclude them from the conditioned space?

Thank you for your time and help.

Asked By Liliane Tricot | Apr 1 14
2 Answers

How to seal a ceiling with insulation above (in Maine)

To Martin Holladay:

Last week you gave this reply to a question about putting cellulose
insulation on top of fiberglass batts in new construction. You have answered
that in full and I thank you for it. However, you made a further comment as
follows: " I hope, however, that your builder remembered to do a careful air
sealing job at the ceiling plane before any insulation was installed."

Please let me know more particularly what should have been done to the
ceiling to seal it properly.

The only air sealing that I know about is that the fiberglass batts have

Asked By Robert King | Apr 3 14
Register for a free account and join the conversation

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