Q&A Forum http://www.greenbuildingadvisor.com/community/rss en How do deviations in average winter temperature affect energy consumption? http://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/37791/how-do-deviations-average-winter-temperature- <p>Off the top of my head I would expect a five percent colder winter to cost five percent more for heating, all things being equal.</p> <p><a href="http://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/37791/how-do-deviations-average-winter-temperature-" target="_blank">read more</a></p> http://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/37791/how-do-deviations-average-winter-temperature-#comments Energy efficiency and durability Fri, 24 Oct 2014 22:58:26 +0000 CHAman 37791 at http://www.greenbuildingadvisor.com Roof insulation http://www.greenbuildingadvisor.com/community/forum/gba-pro-help/37783/roof-insulation <p>Home location in zone 2A Central Florida (Not on the coast). Having 2,053 SqFt living space w/above ceiling blown in insulation R-30 and an additional 1,027 uninsulated space. Fully vented at the soffet with minimal ridge vent. Soon to install 2 solar powered thermostat controlled 1600cfm roof vents. The wall construction is CMU block w/stucco finish. The roof is 6:12 pitch, Arch shingles over 30lb felt paper and OSB. The ceiling plane is tight.</p> <p><a href="http://www.greenbuildingadvisor.com/community/forum/gba-pro-help/37783/roof-insulation" target="_blank">read more</a></p> http://www.greenbuildingadvisor.com/community/forum/gba-pro-help/37783/roof-insulation#comments GBA Pro help Fri, 24 Oct 2014 16:24:37 +0000 Muskogee 37783 at http://www.greenbuildingadvisor.com Radiant Retrofit Best Practice http://www.greenbuildingadvisor.com/community/forum/general-questions/37781/radiant-retrofit-best-practice <p>We recently purchased a home which had a radiant retrofit in the basement approx 10 years prior. Our first winter (last) I noticed some mold showing through the finished flooring (4' x 8' wheat board). Long story short, I found 2 screws had pierced the pex and slowly corroded over the years finally leaking and ruining it all. </p> <p>The layout was 6" wide 3/4" hardboard sleepers glued and nailed to the slab with 1/2" pex between. Over the pex and sleepers, 12" wide aluminum flashing was stapled and then finish flooring. The slab is insulated (2 layers of 2" polystyrene under the slab).</p> <p><a href="http://www.greenbuildingadvisor.com/community/forum/general-questions/37781/radiant-retrofit-best-practice" target="_blank">read more</a></p> http://www.greenbuildingadvisor.com/community/forum/general-questions/37781/radiant-retrofit-best-practice#comments General questions Fri, 24 Oct 2014 14:26:03 +0000 user-420773 37781 at http://www.greenbuildingadvisor.com Will spray foaming my basement rot my sill plate? http://www.greenbuildingadvisor.com/community/forum/general-questions/37779/will-spray-foaming-my-basement-rot-my-sill-plate <p>Hi Martin or whoever would like to add input to my query. I live in Eastern Canada near the coast in a Zone 6/7 environment. I live in an old house with an low ceiling unfinished basement that is freezing cold all winter.</p> <p><a href="http://www.greenbuildingadvisor.com/community/forum/general-questions/37779/will-spray-foaming-my-basement-rot-my-sill-plate" target="_blank">read more</a></p> http://www.greenbuildingadvisor.com/community/forum/general-questions/37779/will-spray-foaming-my-basement-rot-my-sill-plate#comments General questions Fri, 24 Oct 2014 14:05:14 +0000 McLean28 37779 at http://www.greenbuildingadvisor.com Calculating how much air needed to even out temps for minisplit http://www.greenbuildingadvisor.com/community/forum/mechanicals/37776/calculating-how-much-air-needed-even-out-temps-minisplit <p>I'm building an 800sf 2 story house, R20 under slab, R40 walls, R60 roof, as airtight as possible, but likely just double pane windows (due to cost). 12% glazing, mostly on south side, w/ 4" slab on first floor. Using Marc Rosenbaum's heat loss spreadsheet, I get around 4000BTHU building load here in Portland Oregon at the 97% coldest day of 23F and a design temp of 70F, so a delta T of 47F.</p> <p><a href="http://www.greenbuildingadvisor.com/community/forum/mechanicals/37776/calculating-how-much-air-needed-even-out-temps-minisplit" target="_blank">read more</a></p> http://www.greenbuildingadvisor.com/community/forum/mechanicals/37776/calculating-how-much-air-needed-even-out-temps-minisplit#comments Mechanicals Thu, 23 Oct 2014 21:32:36 +0000 tomk358 37776 at http://www.greenbuildingadvisor.com Add R-14 Roxul between the garage attic and the house? http://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/37770/add-r-14-roxul-between-garage-attic-and-house <p>I am currently in the process of insulating my attached garage using Roxul R14 "ComfortBatts". I live in Winnipeg and from experience -- when I did this in my last house -- it can improve the temperature by 10-15 degrees Celsius in the winter, without any heating. (And that was with a non-insulated garage door; my new house has insulated garage doors!)</p> <p><a href="http://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/37770/add-r-14-roxul-between-garage-attic-and-house" target="_blank">read more</a></p> http://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/37770/add-r-14-roxul-between-garage-attic-and-house#comments Energy efficiency and durability Thu, 23 Oct 2014 16:23:33 +0000 artellan 37770 at http://www.greenbuildingadvisor.com Minisplit - One indoor unit for two adjacent rooms? http://www.greenbuildingadvisor.com/community/forum/mechanicals/37769/minisplit-one-indoor-unit-two-adjacent-rooms <p>Do any of the minisplit manufacturers offer a wall mounted indoor unit that will service two adjacent rooms? I'm considering a minisplit to replace the gas furnace and a/c in my 1300 sq. ft. single level home in zone 3A (mixed-humid). Without a shared indoor unit on the common wall between two bedrooms, I might need five indoor units. The multizone minisplits seem to jump from 4 to 8 zones and the price jumps too. I understand the technical problems with one wall unit serving two rooms, but have any of the manufacturers solved them.</p> <p><a href="http://www.greenbuildingadvisor.com/community/forum/mechanicals/37769/minisplit-one-indoor-unit-two-adjacent-rooms" target="_blank">read more</a></p> http://www.greenbuildingadvisor.com/community/forum/mechanicals/37769/minisplit-one-indoor-unit-two-adjacent-rooms#comments Mechanicals Thu, 23 Oct 2014 16:08:07 +0000 SteveR_79 37769 at http://www.greenbuildingadvisor.com Using foam sheeting & faced fiberglass batts http://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/37768/using-foam-sheeting-faced-fiberglass-batts <p>I am insulating my garage ceiling and have laid 1" foam sheeting above the horizontal 2x4 of the trussses. My plan is to put faced fiberglass batts between the trusses up to the 1" foam sheets. Then I would like to put another 1/2" foam sheet over the fiberglass batts, sandwiching the faced fiberglass between the foam sheets. Is there anything wrong with doing this? Thank you for your help!</p> http://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/37768/using-foam-sheeting-faced-fiberglass-batts#comments Energy efficiency and durability Thu, 23 Oct 2014 14:52:17 +0000 Mark W. 37768 at http://www.greenbuildingadvisor.com “Radon Mitigation Systems” article http://www.greenbuildingadvisor.com/community/forum/general-questions/37766/radon-mitigation-systems-article <p>“Radon Mitigation Systems,” June / July 2014, pg 86 -87: Holes on pipe.</p> <p>I look back at the article from June / July 2014, “Radon Mitigation Systems,” page 86 -87, and notice the drawing with the holes on the pipe point up instead of pointing down?</p> <p>I was wondering, is this so people that read the article would see what was meant by the perforated pipe?</p> <p><a href="http://www.greenbuildingadvisor.com/community/forum/general-questions/37766/radon-mitigation-systems-article" target="_blank">read more</a></p> http://www.greenbuildingadvisor.com/community/forum/general-questions/37766/radon-mitigation-systems-article#comments General questions Thu, 23 Oct 2014 13:29:42 +0000 kn942mj 37766 at http://www.greenbuildingadvisor.com Good idea to insulate old house with cellulose? http://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/37763/good-idea-insulate-old-house-cellulose <p>I have a house that is well over a century old, its balloon framed and has no insulation in the walls, i am planning on getting dense packed cellulose, but i want to know if i am creating any moisture problems or other issues that should give me pause.</p> <p>Its vinyl siding over original wood siding on wood planks with 2x4 framing and plaster and lath inside.</p> http://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/37763/good-idea-insulate-old-house-cellulose#comments Energy efficiency and durability Thu, 23 Oct 2014 06:38:29 +0000 Questions4 37763 at http://www.greenbuildingadvisor.com