This site has been invaluable as I attempt to educate myself with respect to designing and hopefully building (with plenty o' help) a 1500 sq. ft. passive solar home.
Here are some details of the current design. See conceptual pictures.
> Climate Zone 5A (Rochester, NY)
> Shed roof. Standing Seam Metal roof with air gap/rain screen
> OSB-SIP walls and roof (R=52 for both)
> Frost-protected shallow foundation, concrete slab on grade
> South windows triple-glazed, high SHGC>0.5, fiberglass (not sure on manufacturer)
> Lunos e2 ductless HRV (2 or 3 pair)
>: Main floor with loft
This may be greedy, but after reading for a few month (along with many other sites - particularly Building Science Consultants), I have a few questions.
1: I am paranoid about moisture condensation/retention, especially under roof panels, rotting the OSB sheathing on SIPS. I am thinking of using a liquid applied air barrier for roof and walls, along with a rain screen/air gap for roof and walls. I assume I should use a vapor permeable product in this case. Correct?
2: Should the slab be a monolithic poor with a thickened edge or some other method?
3: I am totally clueless on heating methods. I quick and dirty web calculation revealed a max heating load of ~9500 BTU/hr (design temp 5F). I have looked at WarmFloor (low voltage radiant heat mats) for slab. I am trying to eliminate any needs for ducts in design. I had also considered a wood/pellet stove but want to minimize my SIP penetrations. Any help here? Space heaters? Mini-splits?
4: Martin H......you mentioned in previous posts a dislike of shed roofs....rationale?
5: Martin H. again.....you mentioned in a previous post that you preferred exposed fastener metal roofs vs. hidden....why?
6: Should I be considering other wall/roof designs besides SIPS for super-insulation? If so, why?
7: Siding material is undecided. Considering Cor-ten (weathering steel) but am open to suggestions.
8: Are triple glazed, fiberglass windows from Canada my best bet? If I was made out of money I would consider German windows.....
9: I realize there is an abundance of south facing windows. I plan to use Window Quilts or insulated shades (both sealed) to provide shading in summer and to prevent heat loss in winter.
Thanks in advance and thanks again for all of the wisdom and experiences shared here.
Posted Sat, 01/04/2014 - 19:55
Edited Sun, 01/05/2014 - 15:29
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