29 Jan '12, 4pm

Green Building Q&A: Adding rigid foam over existing insulation

I like in northwestern North Carolina (zone 7) in a Cape Cod style house. The upper rooms are pretty uncomfortable in the summer. You can feel the heat radiating into the room I presume because it basically has "attic" on three sides that is unconditioned space. There are seven foot-high knee walls on two of the three interior walls in each bedroom with a bath in the middle. The knee walls have fiber glass batt R-19 which sits just proud of the 2X4 stud bay. My thinking is that if I apply some or a couple of inches of rigid foam on top of the wall and leaving the existing batts it would help the batt perform better and reduce the amount of heat being transmitted through the studs, which is really obvious to the touch. If this is sound thinking should I use a Poly Iso board with a foil barrier or just some Dow blue Styrofoam. Then there is the question would this cause any ...

Full article: http://www.greenbuildingadvisor.com/community/forum/energ...

Tweets

rigid foam ceiling question #green

greenbuildingadvisor.com 29 Jan '12, 6am

i'm building an icf home in WV. i have my roof trusses on 24" centers, 2x4 bottom chords, and 9'7" from the floor to the b...

What wrap or spray insulation would be recommen...

greenbuildingadvisor.com 28 Jan '12, 2pm

Martin as usual is spot-on. Cantilever penetrations of the building wall should be considered a no-no for several very goo...

Exterior Rigid Insulation and Siding #green

greenbuildingadvisor.com 03 Feb '12, 1pm

Hi, I recently completed a single family home in Va with 6" stud walls (cellulose) and exterior rigid insulation. I wanted...

A question about straw insulation... #green

greenbuildingadvisor.com 01 Feb '12, 7am

My name is Michael Garrison, a 30 year carpenter with 17 years building experience in Alaska. I had a friend who used stra...

Green Building Q&A: Okay to use Open Cell foam ...

greenbuildingadvisor.com 17 Jan '12, 1am

I have a bonus room that has accessible 3 walls and the ceiling. The room is already insulated on the walls with R-11 and ...

Green Building Q&A: Insulation for Vented Cathe...

greenbuildingadvisor.com 24 Jan '12, 2pm

Hi all. I know the issue of insulation for cathedral ceilings has been addressed before, but I am still confused by what t...

Green Building Q&A: Spray foam insulation - Wha...

greenbuildingadvisor.com 09 Feb '12, 12am

We've had to move some plumbing lines in a freshly spray foamed (open cell foam) insulated wall. This requred us to remove...

Green Building Q&A: Is air sealing still needed...

greenbuildingadvisor.com 09 Feb '12, 4am

Darren, Every house needs an air barrier. The air barrier needs to be continuous, without seams or breaks: under the botto...

Improve air sealing and insulation. Read Green ...

greenbuildingadvisor.com 10 Feb '12, 3pm

I will be removing the exterior sheathing and addressing air sealing & insulation from the exterior. Interior walls (plast...

retrofit insulation #green

greenbuildingadvisor.com 09 Feb '12, 3am

Just finished insulation retrofit on a nearly identical house in southern NH. Homeowner had energy audit performed and the...