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6 Answers

Ductless Heat Pump - Which one?

I am purchasing a ductless mini-split heat pump. I have had several estimates and in all cases the companies recommend a 12,000 or 15,000 BTU unit. Apparently the area I want to heat/cool falls just in the middle for their calculations. I have a 1,500 sq. ft. bungalow with a large open concept living room, dining room, kitchen and front entry which is where the head unit will be. Off the living room are 3 bedrooms (no hallways) 2 on one side and one on the other.

In Energy efficiency and durability | Asked By Robb Francis | Dec 6 12
3 Answers

GBA Pro members: live video feed

Beginning at 8:00 a.m. on Thursday December 6, GBA Pro members can watch a live video feed of a seminar by John Straube:
Building Science Expert Session.

In General questions | Asked By Martin Holladay | Dec 6 12
11 Answers

Article written 10+ years ago about P.U.D. of small homes in Portland, Oregon

Article written 10+ years ago about P.U.D. (planned unit development) of small homes in Portland, Oregon.
Need copy of article, please.
Sustainable homes on 1.0 acre infill lot.

In General questions | Asked By Douglas Powell | Dec 4 12
1 Answer

Allison Bailes has already written a summary of Lstiburek's spray foam presentation

Instant blogging! Allison Bailes has already posted a summary of Joe Lstiburek's December 5 presentation on spray foam -- yesterday's Building Science Corp. seminar.

Yesterday's seminar also included presentations from Mac Sheldon (from Demilec), Mark Bomberg, Rick Duncan (from the Spray Polyurethane Foam Alliance), Xuaco Pascual (Honeywell), Mary Bogdan (Honeywell), and Paul Duffy (Icynene).

In General questions | Asked By Martin Holladay | Dec 6 12
4 Answers

Dripping walls and wet sheathing in new house

A friend of mine has just built a log house with standard 2x4 (or 2x6) wall framing on the second floor in zone 6-7. The walls and ceiling have been insulated (roxul and foam in the walls and pink in the ceiling) but they have not yet put up a polyethylene vapor retarder. They turned on the heat this week and the walls started to drip and the sheathing behind the wall insulation became wet. Essentially, the moisture in the house turned to vapor and quickly condensed on the cold surfaces of the house.

In Energy efficiency and durability | Asked By jessie pratt | Dec 6 12
6 Answers

Leaky house and oversized new HVAC systems?

We bought the farm, so to speak in the deep South - a 1-1/2 story house built in 1950. We are looking for thoughts on dealing with a very leaky house with historic ductwork and new, oversized HVAC systems.

In Energy efficiency and durability | Asked By Sue Davis | Dec 5 12
4 Answers

Best insulation for a barn that will be converted to a workshop

I have a 2 story 24' X 36' barn built on a concrete slab. It is constructed with 6x6 posts, 8' apart. The exterior is board and batten. There is no insulation and no interior wall; i.e. the interior walls are the board and batten siding. Although it is well constructed, there are a few areas were moisture could enter the building. What would you recommend to insulate this type of building?

Thanks!

In Energy efficiency and durability | Asked By Samuel Baum | Dec 5 12
3 Answers

Green roof energy savings

Hello,
As a project for school, I am looking at installing a green roof on a building on the Vanderbilt University campus. We are looking at installing an extensive (6" deep soil or less, with simple plant growth) for a 1500 square foot area that is currently black top. It is a single story building, that is in use 24/7 by students. What would be the estimated yearly energy savings for such a project? This information needs to be approximated for the proposal. Thanks and blessings

In Energy efficiency and durability | Asked By Andrew East | Dec 5 12
6 Answers

Resource for building Passive Solar

HI, I am planning to build a passive solar home in the upper Midwest. There are not any builders in my area that build this way. Besides reading articles on this site, does anyone have any suggestions on how I can accomplish this project? I want to build with ICF's. My concerns would be making sure I have the proper insulation under the basement and in the roof, the right heating for my home and area, the right windows and ventilation system.

In Green building techniques | Asked By Kami Kline | Dec 3 12
3 Answers

Tyvek detail around windows

Help, the windows are here! so i'm all geeked out to check them out and install them. we wrapped the entire house, including the rough openings, in tyvek, BEFORE the windows arrived. our plan was to cut open the wrb, flash the sill with a piece of bevelled siding and flexwrap, then install the window. tyvek recommends making an i-cut in the wrb (one vertical cut in the middle from header to sill and two horizontal cuts from side to side along the header and sill) and wrapping the flaps of the tyvek around the sides of the window and fastening them.

In General questions | Asked By erik olofsson | Dec 5 12
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