Does Iecc Require Siding Insulation For Zone 5

4 introduction to the energy code compliance process.

Does iecc require siding insulation for zone 5. Insulation requirements for slab on grade floors. Zones 6 7 and 8 with 6 inch above grade exterior walls must have r 20 r 5 insulation values. Zones 3 and 4 must have a minimum r value of 20 for their above grade exterior walls. Climate zones 2 8 require two layers of insulation for all other.

The simplified table of building envelope requirements on the previous page applies to new residential buildings as defined in the iecc with wood framing and or mass walls. The new code calls for these values in the exterior walls. Drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding and. This table is often the sources of the misconception that these elements must have continuous insulation in order to comply with the iecc.

Contained in chapter 5 iecc ashrae 90 1 2007 tables 502 2 1 and table 502 2 2 building envelope requirements opaque assemblies. Code establishing a baseline for energy efficiency by setting performance standards for the building envelope defined as the boundary that separates heated cooled air from unconditioned outside air mechanical systems lighting systems and service water heating systems in homes and commercial businesses. The 2012 iecc code has been updated to require increased r values for the exterior wall assemblies in new homes for certain climate zones. 2018 international energy conservation code.

Requirements in the 2012 iecc s prescriptive compliance option for the appropriate climate zones table r402 1 1 and does not reflect any state specific amendments to the iecc. Add r5 insulative wall sheathing beneath the new siding. For exterior walls the 2006 iecc requires both insulation in the stud cavity and continuous insulation ci usually either board stock or sprayed polyurethane foam spf outboard of the exterior sheathing for commercial steel framed wall assemblies in climate zones 5 to 8. Excerpt from 2012 iecc table c402 2 showing prescriptive wall and roof r value 1 requirements.

Heating system capacity 17 000 btu hr 5 kw and a heating thermostat set point that is restricted to 50ºf average wall and roof u factor 0 200 in climate zones 1 5 and 0 120 in climate zones 6 8 comply with the roof solar reflectance and thermal emittance provisions for climate zone 1. Zones 6 7 and 8 with 4 inch above grade exterior walls must have r 13 r 10 insulation values. Zone 5 0 30 0 55 nr 49 20 or 13 5 13 17 30 15 19 10 2 ft 15 19. Fenestration iecc sections r303 1 3 r402 3 r402 5.

Table 1 shows that in chicago climate zone 5 a flat roofed building other than group r must have r25 continuous insulation and masonry walls must have r11 4 continuous insulation to comply with this table. Where insulated siding is used for the purpose of complying with the continuous insulation requirements of table r402 1 2 n1102 1 2 the manufacturer s labeled r value for insulated siding should be reduced by r 0 6.