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4 Answers

In regards to the post by Martin on how cold effects R-5 XPS vs R-6 PolyIso.

I have included a link to a German Study on the effects of cold/heat/moisture on various types of insulation - it seems to state that all insulation suffers degradation at colder temps - which is obviously not what your study points too. Could you possibly elaborate more on this? Am I wrong to read the results the way I have? If not why the difference in outcomes?

Asked By brad hardie | Jan 22 14
4 Answers

Basement insulation

I had an opportunity to purchase a couple of pallets of rigid foam insulation; tapered from .5 to 1" and with a fiberglass embedded facing on both sides. I believe it is polyiso.?
I realize this is for roofing applications but am wondering if I could reverse the tapers to each other to achieve a consistent 1.5", or more, and use it below grade to insulate the interior of a cement block basement.
Thank you!

Asked By Norm Steffen | Jan 16 14
0 Answers

Do you know of a qualified installer of APEX block for a project in CA?

Location: Upland, California.

Project: 2-story 3,400-square-foot commercial building, new construction.

Asked By Dale Cummins | Jan 8 14
1 Answer

Will stucco adhere to peel & stick membranes?

Trying to do a window detail that involves some peel & stick membrane but the question I have is whether or not EIFS/synthetic stucco will adhere to peel & stick or does one have to install EPS over the peel & stick and then stucco?

Asked By Peter L | Dec 28 13
12 Answers

1929 Brick Building in Zone 5A needs insulation— Half of the low-slope roof is very tight and not accessible

We have a 1929 Brick building in Zone 5A with an 8,000 square foot low slope EPDM Roof. It has old single pane windows with cheap metal storm windows attached. The exterior walls are 13" thick, with 9" of hollow bigger bricks, and 4" of regular nice looking bricks).

The first floor has been renovated already, and now we would like to add apartments to the top floor. Before we do this we would like to make some energy efficiency upgrades. Can you recommend what would be best for insulating the attic and or walls?

North half of attic has room to move around in

Asked By Aaron Hirshberg | Dec 3 13
4 Answers

Cellulose insulation in basement?

We are putting a granny suite in our walk-out basement (newly constructed house) and are thinking of insulating the knee walls (wood framed walls between the top of the stepped foundation and first floor deck) and the ceiling with cellulose. The cellulose in the ceiling would butt up against closed cell spray foam at the rim joist. The floor above will be concrete (radiant heating).

Asked By jessie pratt | Dec 23 13
1 Answer

Should I add batts or loose fill above a 2 foot dropped ceiing?

I have a 100+ year old 4-square house with 2 courses of brick for walls. I'm planning on adding rigid foam to the exterior which will extend up to the eaves and the level of the original attic floor.

I'm planning to go to R-40 on the original attic flooring, but I'd like to keep the 2 ft. cavity created by the dropped ceiling accessible. Would it help to add batts or fill between the joists of the lower ceiling? Would any moisture problems be created between the two ceilings?

Asked By John Loughran | Dec 25 13
1 Answer

What is the best heating and cooling plan for renovating an old building into apartments?

We currently have central forced air that has the ductwork going through the cold attic, and the suspended ceiling. I would like to tear out the suspended ceiling and put up drywall over the old broken lathe and plaster.

Should I run new duct work under the floor to floor registers (we have room for this since there is space above the ground floor's suspended ceiling).

Or should I install electric baseboard heat, and a mini split A/C unit.

Asked By Aaron Hirshberg | Dec 19 13
30 Answers

Window condensation issue

I'm in the middle of constructing my home and have discovered a serious condensation / bulk water issue. First some background: We're in southern Maine. The envelope is a double 2x4 stud wall system 10.5" thick insulated with Roxul. Exterior air barrier is taped zipwall and interior air barrier is ADA with taped or gasketed seems and joints. No vapor barrier. We put in Intus Eforte UPVC windows.

Asked By Brian Beaulieu | Dec 8 13
2 Answers

Wall assembly with XPS foam and stucco

I am looking for help with my exterior wall assembly. This is for a house with Stucco exterior and XPS foam. We are building a house in Climate Zone 3 (SF Bay Area). Required wall insulation here is R13, but I would like to do better and add 1 inch XPS foam to increase R value and eliminate thermal bridging.

I am confused about the appropriate wall assembly after reading several articles on GBA and other sites. Code requires "2 layers of Grade D building paper" over the OSB/Plywood.

Here are two wall assembly options I have in mind:

Option A:
1. Drywall

Asked By Thomas Schulz | Dec 16 13
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