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Construction Committee Meeting, Nov. 10, 2010 7 pm, Sunday, Golden Eagle Saloon, Ester Notes: Impromptu meeting with building designers Present: Eric Glos, Deirdre Helfferich (notetaker), Hans Mölders, Gary Pohl, and Matt Prouty Gary and Matt presented a refined concept design, showing site, floor plans, elevations, and two cutaway sections of the interior. Basement idea: - Eric and Hans asked about the possibility of dropping the mechanical and communications rooms into a partial basement. Would require a stairwell, might cut into the bank and destabilize. Matt said that one concern was that we are already excavating 8 feet down, and could cause sinkage from heating one part of the footprint differentially.
- Eric: what about a full-size space and backfill with gravel or bladders full of water? Thermal mass from bladders.
- CCHRC uses membranes and adjustable foundation. An engineering issue.
- Matt: could use sand [instead of gravel]: backfill sand around a watertank.
- 4 foot 9 inch crawl space, backfill floor, polyethelene lining. [Note: 64” better, use standard size. Not sure why 4’9”—frostline?]
- Cost: probably around $50,000 additional, would cost more because of the additional floor slab, problem of differential heating.
Walkthrough on plan: p. 1: site - Site is zoned GU1. Parking lot includes 4 headbolt heaters.
- FNSB won’t get definite about a culvert, so put one in anyway. GVEA reluctant to put a power pole on the small upper piece because of possibility of sale, but library owns anyway and could replat into one piece in future. Not required—putting the power pole from this piece okay by Hoener, who owns adjoining property.
- 200 amps on pole. Could put in separate meter here for custodian cabin (extra cost, but provides an incentive to conserve electricity).
- “Hans’ bridge”—across gully area (not shown on map—path up to the future [hypothetical] bridge. [Zip line to gazebo!]
- Site design by USKH, estimated at $8,500. Parking, grading, septic drainage, walkways. Path needs to be accessible.
p. 2 & 3: first floor plan, gantry level - Office could have a book drop. Electricity from the north. Floor drains for both bathrooms. Triple sink, washup sink, mop sink, and floor drains make it okay for beverages re DEC.
- Per Dan Givens, hot domestic water could be run from masonry heater.
- Carpet in work area, colored concrete elsewhere, tile in wet areas. Gantry level would be metal. Eric liked the circular staircase, 3-foot width of gantry. Gantry area could be made wider, so long as it does not exceed 250 square feet. At 215 square feet right now. Gantry has no contact with the outer wall. Could capture a small space for seating (staff area, not public).
- Eric: SIPS panels? Double wall construction: cheaper, more easily constructable. More wood. Eric happy with double wall construction.
- Roof: small truss, blown-in insulation, ventilated. Cold roof.
- Hypothetical south panel: could be solar PVC panels, water/glycol heating. Question from Hans for Mike and Todd re possible solar panel placement: as shown (section of south wall), would this cut out light for passive solar heating?
- Matt: wouldn’t be in the right place. Talked with Richard Seifert about this: passive gain from the southeast corner primarily, couch area. It’s a net liability to have too many windows. So the area to south for solar panels (thermal or photovoltaic) would not cause problems there.
- Subfloor: water/thermal storage, coils. Concrete on plywood (not Gypcrete). 1.5 inches would be enough for the sill plate (per Hans), 2 inches in Gary Pohl’s house, so 1.5 to 2 inches deep. Use fiberglass, colored concrete. 6 inches on center.
Heating systems: redundancy built in. - Masonry heater: baseline heat.
- Biomass/oil heater: upper level of heat, human comfort.
- Solar: additional support [during shoulder seasons].
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