|Re: Insulated Concrete Forms (ICF)||<– Date –> <– Thread –>|
|From: castrohom [at] aol.com (castrohomaol.com)|
|Date: Fri, 8 Jan 2016 05:51:43 -0800 (PST)|
Thanks Jerry - and Tom One of the considerations here in North Central Florida is that ICFs are insect/termite and moisture/mold resistant. Seems like SIPs are too costly - we are trying to keep costs down Miranda On Jan 7, 2016, at 11:55 PM, Jerry McIntire <jerry.mcintire [at] gmail.com> wrote: > > Insulated concrete forms use lots of concrete, which has a bigger > environmental impact than lumber (the equivalent structural component), and > plastic foam to insulate which also has a greater environmental impact than > recycled cellulose which is easily used in a wood-framed structure. > > If thermal mass is needed in a passive-solar design, ICFs don't provide it > because the concrete is insulated on both the exterior and interior. > > What are they good for? Basement walls maybe. > > SIPs panels are another alternative I like more than ICFs. They have a > greater R (insulation) value per wall thickness than ICFs and have equal or > better structural value if polyurethane foam is used in the SIPs. They can > be used for roof, wall, and floor panels and they save on labor costs. > > Jerry McIntire > > On Thu, Jan 7, 2016 at 12:05 PM, Thomas Lofft <tlofft [at] hotmail.com> wrote: > >> >> >> ON Date: Wed, 6 Jan 2016 10:39:27 -0500 >> From: Miranda Castro <mirandacastro [at] aol.com> >> Subject: [C-L]_ Insulated concrete forms >> Miranda wrote: >> Hi All >> I am curious as to whether any cohousing group has used "insulated >> concrete forms? in the construction of their homes - >> or researched this and decided not to and if so why. >> Thanks so much >> Miranda >> >> >> Hi, Miranda et al.: >> At Liberty Village, MD, http://www.libertyvillage.com >> there was one home built with ICF (Insulated Concrete Forms) which is now >> 15 years old. >> I witnessed the construction, but was neither the builder nor the project >> manager, however, I do now own the home. >> I have otherwise watched the development and use of this technology and >> consider it very beneficial. >> However, I'm not sure how its current cost balances against all its >> benefits. >> Local construction costs will depend upon both material and labor typical >> local cost variables. >> >> Benefits: It creates a very airtight structure, >> It's very highly resistant to external noise; >> It's well insulated and totally air infiltration resistant except at >> openings for doors, windows and utilities which must be well sealed; >> It's insulation levels can be upgraded by thicker ICF's at the onset. >> The roof structure may be conventional framing or trusses with structural >> insulated panels (SIP's) used for roof structure. >> >> Constraints: >> It requires a very well trained and experienced crew and manager to be >> well constructed; >> Like any other construction it is still totally dependent upon >> knowledgeable soils testing and foundation construction; >> Effective use for a PassivHaus would still require high insulation values >> for doors and glazing, possibly triple glazed; >> I expect long term value will be very high, offsetting possibly higher >> initial expense. >> >> Similarly, this house was also developed with Ground Source Geothermal >> Heat Pumps for Heating & Air Conditioning (HVAC). >> These also added front end expense in 2000, but very high value long term >> benefits with HVAC operating expenses less than 50% of comparable fossil >> fuel costs. >> I personally believe strongly in making front end investment for long term >> value, so I have added photo-voltaic (PV) panels to the rooftop. >> In this case, the house was planned for perfect southerly roof orientation >> and all roof penetrations were avoided. >> In 2014, 36 - 255 watt PV panels were added for a 9.2 KW DC system, >> eliminating any electricity cost from last May through this month. >> The house is about 2,400 sq. ft. on 2 levels, with three baths, four >> bedrooms, 2 kitchens, 2 living-dining areas. >> It is currently used as an upper and lower level duplex, and has an >> attached 1 car garage. >> It is now offered on the local real estate market for $385,000, including >> a 30,000 sq. ft. lot. >> All inquiries are invited. >> >> http://www.realtor.com/realestateandhomes-detail/9158-Liberty-Village-Way_Union-Bridge_MD_21791_M55665-62139 >> >> Tom Lofft >> Liberty Village, MD >> >> >> >> _________________________________________________________________ >> Cohousing-L mailing list -- Unsubscribe, archives and other info at: >> http://www.cohousing.org/cohousing-L/ >> >> >> > _________________________________________________________________ > Cohousing-L mailing list -- Unsubscribe, archives and other info at: > http://www.cohousing.org/cohousing-L/ > > _________________________ Miranda Castro Mailing: 2349 NW 32nd Place, Gainesville, FL 32605 Phone: 352-505-8545 Email: mirandacastro [at] aol.com
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