Community: GBA Pro help

Q & A Instructions

[Click map to enlarge]

The web site has a wealth of articles on a wide variety of construction topics. Before posting your question, you may want to check out the articles on this page: How To Do Everything. You just might discover an article there that provides the information you seek.

Please register for a free account or sign in to ask and answer green building questions.

If you want to post a question, 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!

2 Answers

Vegetative roof assembly details

I am searching for the drawing details for a vegetative roof assembly. Are there any drawings on the site that I can use. I searched through the roof assembly details and I did not find any. Am I looking in the right place? Thanks for your help.

Asked By Edward Palma | Apr 30 09
2 Answers

Are there any high-efficiency oil burners that will burn pure biodiesel as well as the biodoesel blends?

Are there any high-efficiency oil burners that will burn pure biodiesel as well as the biodoesel blends?

Asked By Edward Palma | Apr 25 09
1 Answer

Frostproofing an existing slab on grade

I am a residential designer working out of northern Wisconsin. I have a project I am working on that has an existing house with a full basement built about 10'-0" from an existing slab-on-grade garage. I would like to attach the garage to the house with a breezway-type addition. Is there a way to frostproof the existing garage either by digging down 4'-0" vertically & sliding rigid insulation into the trench, or I believe I have seen shallow frostproofing where rigid insulation is laid horizontally just below grade out to a point out 4'-0" from the edge of the slab. Or a combination of both?

Asked By jeff hibbard | Apr 20 09
1 Answer

Does one need to ventilate a small roof area when replacing old fiberglas insulation with closed cell polystyrene?

Thank you very much for your quick response. The bathroom tub area extends 4'6" from the back wall of the house and is 8' wide. As I stated before there is a ventilated soffit with 2" strip vents around the total eaves area of the house. The 8'shed roof does tie in to a ventilated attic space. If I am understanding correctly, it would be unwise to eliminate that part of the continuous eaves venting because the 8" width ties to an existing ventilated attic. I do not mean to be redundant and ask again, but am I understanding you correctly.

Asked By Edward Palma | Apr 6 09
1 Answer

Does one need to ventilate a small roof area when replacing old fiberglas insulation with closed cell polystyrene?

I have recently gutted a bathroom in my 53 year old house which had old fiberglas insulation in the shed roof and walls. The roof line is a low pitch (3/12)shed roof framed with existing fir 2x8 rafters, and ties into the main gable roof (7/12) at the eaves. I would like to insulate the walls and roof with closed cell polystyrene because it is a tub area extended out off the back wall of the house. The framed floor of the tub area is insulated with R-40 closed cell polystyrene, under 3/4 t&g plywood.

Asked By Edward Palma | Apr 5 09
10 Answers

What tolerances are required on grade preparation for an insulated slab floor

We are building a super insulated shop(4000 sq ft) with a concrete slab floor with radiant floor heat. thermal calculations and recommendations from American Concrete Institute indicate we should put 3" of extruded polystyrene insulation and a vapor retarder topped by 8" of gravel under the 6" floor. What tolerances are really required on the grade flatness under the insulation? Our sub-contractor is is charging a lot for a very tight tolerance. also, would 3 layers of crossed 1" foam be better and more forgiving than 1 3" layer?

Asked By Anna Johnson | Apr 1 09
4 Answers

Problem with Not to scale Details

I have started looking at the CAD details concerning how the window interfaces with framing and weather barrier.
I downloaded the head sill and jamb details for windows used with siding.
I put them together in a composite drawing(head/jamb/sill) and noticed that the materials and components do not "line-up".
I understand that the drawings are "not to scale" probably in order to exagerate the flashing layers.
Maybe what is needed is one drawing that is to scale and another that illustrates an exploded view to illustrate the layering.

Asked By John Brooks | Mar 18 09
1 Answer

Changing Gears -- Getting into Green Policy and Research

I have an undergraduate degree in Forest Science and Forestry and a MS in Forestry from the University of Maine. I have always geared my interests and research towards climate change. After moving to San Diego I pursued other interests and have been building residential homes for about 5 years. Recent injuries and economic conditions make this an ideal time for me to get change gears a bit and combine my experiences. There are many aspects of green building that I see as exciting. Do yo have any advice or direction that may be of help to me?

Asked By George Visscher | Feb 25 09
Register for a free account and join the conversation

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