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0 Answers

Airsealing an attic.

Hello, I have a 172 year old brick home and have some questions regarding attic venting. My attic is in poor shape. It was "finished" when the house was built, with plaster walls, a flat plaster ceiling and 1 partition wall. I've been in the house about a year and am just now deciding to do some work up there. There are sections of sagging plaster and a few holes in the ceiling. I decided to widen a hole in the ceiling to peek up into the very top of the roof. The timbers look like they're in great shape but the masonry at the gable ends and chimney stacks are crumbling.

Asked By Dan McGonigle | Dec 21 14
49 Answers

Wet OSB - how much water can it take?

We are two weeks from having trusses and roof on our new house. The rains are killing us. We painted the subfloors before the rains and have been sucking water after each storm. We are dreading putting the hardwood floors down (someday). How much damage can happen due to this rain, glad it's helping the drought, but it's definitely stressing us out!

Asked By colleen1 runyen | Dec 17 14
3 Answers

Is a gas fireplace blower fan an energy-efficient investment?

In reading some of the prior blogs concerning the issues surrounding a ventless fireplace I was struck by the strong feelings for both positive and negative positions on a ventless design. My question actually pertains to the energy efficiency and advisability of adding a blower fan set up to a fireplace . Does a blower fan make the fireplace much more efficient in terms of using the BTU's created by combustion of gas? It certainly seems that it should. It also seems that a blower fan would exacerbate the distribution of negative byproducts if that is in fact an issue.

Asked By W. Timothy Ward | Dec 20 14
11 Answers

Meanwhile at BSC ... PHIUS draft standard

Not sure it was linked here .....
But it might interest some of us that missed the hint from PHIUS or PHAUS

http://www.buildingscience.com/documents/bareports/ba-1405-draft-climate...

BA-1405: Climate-Specific Passive Building Standards

Draft paper from PHIUS and BSC .

Still reading and learning, interesting stuff.

Might we discuss the proposed standard now ? :)

Asked By Jin Kazama | Dec 12 14
2 Answers

Closed-cell spray foam on roof deck... shingle underlayment choice?

Good day,

I'm planning on doing spray foam insulation on the underside of my roof deck.

I'm about to start shingling next week, and was planning on using synthetic roof paper instead of tar paper.

Then I read an article saying that on unvented roof assemblies (what this will be), most synthetic roof underlayments should NOT be used.

I did some digging, and the product I had planned to use called "Rhinoroof" has a perm rating of 0.5, aka it would create a vapor sandwich between my shingles and under deck roof insulation.

http://www.interwrap.com/RhinoRoof/RhinoRoof-U15.html

Asked By Mark Helmrich | Dec 19 14
10 Answers

Rigid insulation

Builder put rigid insulation on the exterior of the house.
But it is not sealed! Should they have put metal flashing on first?
Picture is looking up foundation wall, insulation, siding.

.

Asked By Shawn Ward | Dec 16 14
1 Answer

Since drywall has a permeance of 0.02 liter/sec - m at 75 PA is ever possible to have sheathing dry to the interior of the home?

When constructing a new home most professionals recommend not have impermeable insulation or other materials on both sides of the sheathing. It is recommended that the sheathing should be able to dry to the exterior or interior of the home. If foil faced polyiso rigid foam is used on the exterior of the plywood sheathing and 6 inches of open cell foam and drywall is used on the interior of the home, will this configuration allow the home to dry to the interior? Considering the permeability of drywall will it ever allow drying to the interior of the home with any type of insulation?

Asked By JOSEPH POLAND | Dec 18 14
27 Answers

B&G's low flow Vario ECM circulator - stupid efficient pumps

http://bellgossett.com/pumps-circulators/small-circulation-pumps-booster...

What I discovered as a result of the research stimulated by this GBA dialogue is that my circulator controlled hydronic heating will not work with a smart pump like the Alpha, Bumble B or the new Taco model.

Asked By flitch plate | Dec 16 14
25 Answers

Foam-free builds

All the talk about sub-slab foam levels has me thinking. What floor systems easily allow foam free construction? Pier construction immediately comes to mind, but beyond that?

Asked By Malcolm Taylor | Oct 4 14
6 Answers

Retrofit insulation of an exterior wall

I want to insulate my exterior wall and have the room gutted. I am in the Poconos of Pennsylvania and in Zone #5 I believe. I have 2x6 walls with Tyvek wrap, OSB siding and vinyl siding. The walls had R-19 faced fiberglass batts that were installed poorly. Currently all of the wall cavities and studs are exposed and are in perfect condition. The studs, tyvek and insulation have absolutely no moisture issues at all. They look like the day they were installed 22 years ago. I want to insulate but have questions about vapor issues. I sealed the rim joist with closed cell spray foam.

Asked By John Divincenzo | Dec 17 14
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