Q&A: A Forum for Green Building Experts and Beginners

[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!


5 Answers

Laying out mini-splits for a new home

I have a new home in the design stage and have been working with with my HVAC sub and the wholesaler to layout and locate mini-splits for the project. The house will be 2550 sq.ft. on a slab with R40 walls, R75 ceiling and very tight. We are in zone 5, floor plan is attached. We will be installing an ERV for fresh air.

The HVAC guy and the wholesaler want to put a head in each bedroom as well as the entry, office, family room and great room and run them off of 2 separate outdoor units. Their concern is to provide uniform temps throughout the house.

In Mechanicals | Asked By Terry | Apr 17 15
16 Answers

Flooring questions

Hi guys,
I just did the flooring in the basement, and on a different forum in the midst off a question got told off for the flooring I did.

I did concrete slab, 6 mil poly, 1 inch XPS, 1/2 inch OSB.

I was planning to put floor finishings on top. However I was told that it needs to be redone or else the wood will rot.

Does what I did look that bad? Is there a way out of it short of a re-do?

Thanks

In General questions | Asked By sr kod | Jan 27 15
2 Answers

Densglass & Stucco

Can one apply EIFS or stucco directly to DenGlass or does one need to treat DensGlass like wood/OSB sheathing?

Can DensGlass be used on a soffit with it directly being applied to the OSB sheathing?

In Green building techniques | Asked By Peter L | Apr 19 15
5 Answers

Hardwood flooring question

Have about 3000 sq-ft area that needs to be covered. We would prefer Bazillion Cherry but not sure whether we want pre or on site finish?

Pre-finish:

Pros: Factory durable finish and the beveled edges which is what we like.

Cons: Shorter/inconsistent plank lengths

On site finish:

Pros: Longer plank lengths

Cons: Finish depends on the installer but might not be as good as pre-finish

Questions:

What finish (on site or pre-finish) and what time of surface finish (oil or water based) do you guys advice?

Would appreciate any and all feedback?

Thanks

In Interior design | Asked By Beenash Khan | Apr 19 15
3 Answers

Should I consider using waterproof concrete for my foundation?

I have been looking carefully at my options for waterproofing the basement foundation of my future house in Vermont. I expect that the foundation will experience periods of hydrostatic pressure, so I am looking for the best waterproofing system with reasonable costs (e.g. up to $4000). I will, of course, install footing drains and a free draining layer on the outside of the foundation, and until recently I was planning to use a professionally applied elastomeric spray-on waterproofing product.

In Energy efficiency and durability | Asked By Timothy Denny | Apr 19 15
15 Answers

Request for comments on this wall mock-up.

CZ 6B - SW Colorado - 7000'

In General questions | Asked By Chuck Jensen | Apr 18 15
5 Answers

Insulating a parallel scissor truss roof

The new side of my reno and expand project will have a 8/12 cathedral ceiling with parrallel scissor truss. I am planning R80 so 24" of batt or blown insulation in the truss space.

My question is.... since this insulation will be applied from the inside (well after the roof sheathing and then shingles are applied) how do I provide a space between the underside of the roof deck and the top of the insulation?

In Energy efficiency and durability | Asked By AlCocklake | Apr 12 15
7 Answers

Floor Slab: Is a Vapor Barrier Needed with Rigid Foam?

If one is using 3" of rigid foam (EPS) underneath a 4" slab-on-grade, does one still need to install a vapor barrier?

Here is the build-up from the ground up:

4" compacted AB
3" EPS (termite treated)
4" concrete

In Green building techniques | Asked By Peter L | Apr 18 15
3 Answers

Do I need to use concrete screws for plywood over an insulated floor?

i am following your advice on using XPS on concrete basement floor followed by two layers of 1/2 inch plywood. My concrete floor is 15 yrs old will I have trouble with concrete screws in older concrete? Can I just fasten the second layer to the first layer of plywood or can I use adhesive on the first layer or do I need the concrete screws?

In GBA Pro help | Asked By Rita Erskine | Apr 17 15
7 Answers

Cathedral ceiling rebuild techniques?

I have 900 sq feet of cathedral ceiling. Zone 7b. Its 2x10 rafter construction. No venting with recessed lights. Mold and moisture remediation will begin in 2 weeks. I've been doing lots of reading on GBA, I love this site and forum. Right now, the rebuild plan is a sealed ceiling with 4" of 2lb spray foam with the remainder of the rafter bay filled with fiberglass batts. All recessed lights will be removed. I'm considering T&G for the interior finish. Will the T&G change my insulation plan? Am I missing anything?
Thanks.

In Energy efficiency and durability | Asked By Scott Buchanan | Apr 2 15
Register for a free account and join the conversation


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