IRC-N i Pool Heaters: All pool heaters shall be equipped with an readily-accessible on-off switch to allow shutting off the heaters w/o adjusting the thermostat setting. Pool heaters fired by natural gas/LPG shall not have continuously burning pilot lights. Time switches that can automatically turn on/off heaters and pumps to a pre-set schedule shall be installed on swimming pool heaters/pumps.
IRC-N Pool Covers……Heated pools shall be equipped with a vapor retardant pool cover on or at the water surface. Pools heated to more than 90F shall have a pool cover with a minimum insulation of R-13.
IECC Snow Melt System Controls Snow & ice melting systems, shall include automatic controls capable of shutting off the system when the pavement temperature is above 50F and no precipitation is falling and an automatic or manual control that will allow shutoff when the outdoor temperature is above 40F.
IECC Certificate……A permanent certificate shall be posted on the electrical panel. Certificate to be completed by the builder or design professional. It shall list the R-values of insulation(ceiling/roof,walls, foundation/slab, basement wall, crawlspace wall and/or floor) and ducts outside conditioned space. U-value and SHGC of fenestration. Types and efficiencies of HVAC & DHW heating equipment.
IRC-N1104 IECC Lighting Equipment……A minimum of 50% of the lamps in permanently installed lighting fixtures shall be high-efficiency lamps. Compact fluorescents qualify, standard incandescent bulbs do not.
IRC-N Recessed lighting installed in the building thermal envelope shall be sealed to limit air leakage between conditioned and unconditioned space. All recessed lights shall be IC-rated and labeled as meeting ASTM E238. They must be installed with a gasket or caulk between the housing and the interior wall or ceiling covering.
IRC IECC Where the primary heating system is a forced air furnace, one programmable thermostat per building unit shall be capable of controlling the heating/cooling system on a daily schedule to maintain different temperature set points at different times of the day. The thermostat shall have the capacity to operate the system to maintain temperatures down to 55F & up to 85F. It should be programmed w/ a heating set point no greater than 70F and cooling no lower than 78F.
IRC-N /IECC Heat Pump Supplementary Heat Heat pumps having supplementary electric- resistance heat shall have controls that, except during defrost, prevent supplemental heat operation when the heat pump compressor can meet the heating load.
16 Code requires “too tight” construction
IRC-N1102-4/IECC Building Thermal Envelope The building thermal envelope shall be durably sealed to limit infiltration. The sealing methods between dissimilar materials shall allow for different expansion and contraction. The following shall be caulked, gasketed, weatherstripped or otherwise sealed with an air barrier material, suitable film or solid material.
IRC-N /IECC Building envelope air tightness and insulation installation shall be demonstrated to comply with one of the following two options: N ……Tested air leakage is less than (7) ACH when tested with a blower door at 50 pascals. N ……Visual Inspection option. The items listed in Table N , applicable to method of construction, are field verified. Where required by code official, an approved party independent from insulation installer shall inspect the air barrier and insulation.
Visual Inspection Option All joints, seams and penetrations. Site built windows, doors & skylights. Openings between window and door assemblies and their jambs and framing. All utility penetrations. Dropped ceiling or chases adjacent to the thermal envelope. Kneewalls. Walls and ceiling separating garage from conditioned space
Behind tubs and showers on exterior walls. Common walls between dwelling units. Attic access openings. Rim& band joist junction. Other sources of infiltration.
Duct Leakage Test pressure differential of 25 Pa across the entire system including the air handler enclosure 23 Required: duct leakage to outside shall be less than or equal to 8 cfm per 100 ft2 of CFA or a total leakage less than or equal to 12 cfm per 100 ft2 CFA
IRC- N /IECC Ducts, air handlers, filter boxes and building cavities used as ducts shall be sealed. Joints and seams shall comply wit Section M Duct tightness shall be verified by either of the following: 1. Post construction test: Leakage to outside shall be less than or equal to 8 cfm per 100 ft2 of CFA or a total leakage less than or equal to 12 cfm per 100 ft2 of CFA when tested at 25 pascals across the entire system, including the air handler enclosure. Dust test not required if the air handler/ducts are located in conditioned space.
ROUGH-IN TEST Total leakage shall be less than or equal to six (6) cfm per 100 ft2 of CFA when tested at a pressure differential of 25 pascals across the roughed in system, including the air handler enclosure. If the air handler is not installed at the time of the test, total leakage shall be less than or equal to (4) cfm per 100 ft2 of CFA.
IRC-M Sizing……HVAC equipment shall be sized in accordance wl/ ACCA manual S based on building loads calculated in accordance with ACCA manual J or other “approved” heating and cooling calculations methodologies.
IRC-R408.3 Unvented Crawl Space……Ventilation openings in under-floor spaces shall not be required where: R ……Continuously operated mechanical exhaust a rate equal to (1) cfm per 50 ft2 of crawlspace floor area, including an air pathway to the common area and perimeter walls insulated to N OR-
R ……Conditioned air supply sized to deliver (1) cfm for each 50 ft2 of under floor area, including a return air pathway to the common area and perimeter walls insulated in accordance w/ Section N
IECC Section 405 Simulated Performance Alternative Previous versions of the IECC allowed reductions in R-values to below code levels if HVAC equipment was improved to above code levels. For example, utilizing a high efficiency gas furnace could allow a reduction in ceiling or wall insulation. The 2009 IECC eliminates this as these trade offs are by definition energy neutral and in theory would not impact energy use. However, envelope measures have longer lifetimes than HVAC so there could be long term impacts.