| Building
America Efficient Portable Classroom Program
New
Construction Procurement Guidelines for the Pacific Northwest
DESIGN
QUALIFICATION AND CERTIFICATION:
General:
Electrically-heated and combustion fuel heated portable
classroom buildings shall be built to Building America's Energy-Efficient
Portable Classroom Program specifications. Implementation
of these in-plant specifications, set-up specifications commissioning,
maintenance and operation specifications will help ensure
lowest life cycle costs, maintain acceptable indoor air quality
and comfort standards and provide a suitable learning environment.
These
specifications have been developed with support from the US
Department of Energy's Building America Program partners and
the Oregon Office of Energy, the Idaho Energy Division of
the Department of Water Resources and Washington State University
Energy Program.
Additional
information is available at:
- Technical
assistance regarding these specifications is available from:
- Washington
State University Energy Program - Michael McSorley: (360)
956-2008
- Idaho
Department of Water Resources, Energy Division - Bob Minter:
(208) 327-7970
- Oregon
Office of Energy - Betty Merrill/Justin Klure: (503) 373-1581
Table
1. Recommended Portable Classroom Specifications
| Component |
Description |
Component
U-factor |
Nominal
R-value |
| Ceilings |
Flat |
U-0.036 |
R38 |
| |
Sloped |
U-0.033 |
R30 |
| Walls |
Above
Grade |
U-0.065
|
R19 |
| Floors |
Steady
State |
U-0.041 |
R30 |
| Glazing |
U-0.371 |
n/a |
| Skylights |
U-0.51 |
n/a |
| Exterior
Doors2,3 |
U-0.19 |
n/a |
| Building
Tightness |
Tested
to achieve air tightness of less than 8.0 ACH @50PA. |
| Ductwork
Tightness |
Tested
to ensure total leakage rate of less than 30 CFM @ 50PA. |
| Ductwork
Design and Materials |
All
ductwork shall be located within the pressure envelope.
Metal
ductwork shall be sealed with water-based mastic.
Duct-board
shall use water based mastic and/or UL181AP tape.
Tapes
shall be installed per manufacturer listing instructions. |
| Lighting |
All
interior ceiling lighting shall be rapid start T-8 fluorescents
with electronic ballasts with a CRI of 75. The controls
shall be an on-off switch for each bank of lights. |
| Quality
Control |
The
manufacturer's quality control inspector shall certify
that each building meets or exceeds all requirements
of these specifications.
An
authorized state plant inspector shall verify that each
building has been inspected at least once during its
construction and that the inspected measures meet or
exceed the requirements of this specification.
School
district personnel are also encouraged to inspect these
classrooms during site set up. |
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1NFRC
tested U-factor.
2Door
frame shall be of thermally improved material(s).
3Up
to 1 ft2 of security glass is allowed in doors.
THERMAL
EFFICIENCY:
General
Insulation: All insulating materials shall be installed
according to the manufacturer's instructions to achieve proper
densities, minimize voids and maintain uniform R-values.
Clearances:
Where required by applicable codes, or where specified in
the following sections, proper insulation clearances shall
be maintained.
Insulation
installed around exhaust vents shall comply with manufacturer's
recommendations.
All
ventilation baffles in attics/roofs shall be moisture-resistant.
Ceiling
Insulation: Ceiling insulation shall be installed to meet
the nominal R-values specified in Table 1 or as approved.
Ceilings
insulated with fiberglass batt insulation shall use full-width
batts which cover the truss members and extend the entire
attic length without visible gaps.
Insulation
with a vapor barrier shall be installed to minimize compression-face-stapling
is preferred over stapling to the side of the joist.
Wall
Insulation: Insulation shall be installed to minimize
compression and voids as a result of plumbing or wiring wall
cavities.
Where
structural conditions allow, headers over windows and doors
shall be insulated.
Where
structural conditions allow, insulation shall fill the cavity
between corner studs and other wall structure materials.
Spaces
around window and door frames greater than ½ inch shall be
filled with an insulating material.
Insulation
with a vapor barrier shall be installed to minimize compression-face-stapling
is preferred over stapling to the side of the stud.
Floor
Insulation: Floor insulation shall fill floor joists to
the manufacturer's insulation density or greater.
Insulation
shall be installed to minimize compression and voids as a
result of plumbing or wiring in floor cavities.
Set-Up
Kit: Manufacturer shall include an approved marriage line
sealer, and instructions on how and where to install it.
Door
and Glazing u-factors: U-factors for doors and glazing
shall be determined certified and labeled in accordance with
the National Fenestration Rating Council (NFRC) Product Certification
Program (PCP), as authorized by an independent certification
and inspection agency licensed by the NFRC.
Glazing:
To improve ambient lighting, all portable classrooms built
to these specifications shall have operable transom windows
installed on one wall. There shall be a minimum of 18 square
feet of operable transom windows installed.
In
addition to the transom windows two standard vinyl framed
windows shall be installed; one window on each side wall.
Each window shall have a minimum of 12 square feet of glazing
area.
Window
frames and sashes shall be constructed of vinyl, wood or other
approved materials. Vinyl frames and sashes shall be joined
with external and internal welds.
Window
Location: Windows shall be located on opposite to ensure
passive cross ventilation.
Skylights:
Skylights with a maximum of 16 square feet of surface area
may be installed in lieu of transom windows provided they
are double glazed with a minimum U-factor of 0.50. Up to
10ft2 of non-NFRC rated solar daylight tube may
be installed if it is sealed from the conditioned space, and
has a tube wall insulated to at least R-19.
AIR
LEAKAGE CONTROL
All
buildings shall be sealed using the following standard air-leakage
control method and approved sealants. An average air change
rate of 0.35 air changes/hour shall be used to calculate thermal
losses.
All
buildings shall comply with the following prescriptive requirements,
or as approved to achieve the tightness levels specified in
the prescriptive path.
Windows:
Tested air-leakage rates shall not exceed 0.3 cfm/linear
foot.
Doors:
Tested air-leakage rates shall not exceed 0.2 cfm/linear
foot of perimeter.
Caulking
and Sealing: All penetrations through the building envelope
shall be caulked or otherwise sealed to limit air leakage,
including the following:
-
Ceiling - ceiling and roof insulation shall be installed
with a complete air/vapor barrier installed on the warm
side of the insulation, with all corners and seams sealed.
Sealing can be accomplished using sheetrock tape and texture,
or 6 mil plastic sheeting.
-
The floor and wall marriage line - sealed using using
gasket and non-porous silicon caulking, foam or closed cell
backer rod.
- All
window and door frames - sealed to the building envelope.
If the seal is made on exterior grooved siding, then the
groove lines shall be sealed at the door or window frame.
- Exterior-wall
sole plates and the structural floor - caulked using
silicon caulking or approved alternate.
- All
receptacles, switches or other electric boxes in exterior
walls - sealed or fitted with outlet plate gaskets.
- HVAC
ducts - sealed at interior surfaces where ducts penetrate
the building envelope.
- Around
openings in the building envelope for HVAC and ventilation
ducts, and wiring.
- All
other penetrations in the building envelope.
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