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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
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