Condi1oned A3cs and Crawlspaces. Making the Decision. Find This Presenta1on. Helpful Informa1on. page/
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1 Condi1oned A3cs and Crawlspaces Making the Decision Find This Presenta1on Helpful Informa1on page/ It will be posted under 2009 IECC
2 Learning Objec1ves Helpful Informa1on 1. In accordance with code, you should be able to explain one requirement of an unvented a3c. 2. What are the three non- ven1lated a3c vapor retarder op1ons for your climate? 3. How well do cathedralized a3cs compare to vented a3cs regarding energy use? What are the major factors? 4. What are three requirements of a condi1oned crawlspace? Agenda What will be covered Why Conditioned Attics and Crawls? Moving ducts inside review IRC and BP Conditioned Attics IRC and BP Conditioned Crawls
3 Why? Why? To save energy To enhance indoor air quality To enhance building durability Developed by Bruce Sullivan Earth Advantage Institute
4 Saving Hea1ng and Cooling Energy Developed by Bruce Sullivan Earth Advantage Institute Saving Hea1ng and Cooling Energy Developed by Bruce Sullivan Earth Advantage Institute
5 Saving Hea1ng and Cooling Energy Saving Hea1ng and Cooling Energy
6 Saving Hea1ng and Cooling Energy Saving Hea1ng and Cooling Energy
7 What does inside mean? Uncondi1oned Duct Heat Loss
8 Unvented A3c Assemblies 2009 IRC R806.4 Unvented a3c assemblies (spaces between the ceiling joists of the top story and the roof raaers) shall be if all of the following condi1ons are met: 1. The unvented a3c space is completely contained within the building thermal envelope. (Not in the 2006 IRC) 2. No interior vapor retarders are installed on the ceiling side (a3c floor) of the unvented a3c assembly. Unvented A3c Assemblies 2009 IRC R806.4 Unvented a3c assemblies (spaces between the ceiling joists of the top story and the roof raaers) shall be if all of the following condi1ons are met: 3. Where wood shingles or shakes are used, a minimum ob ¼ inch vented air space separates them and the roofing underlayment above the structural sheathing.
9 Unvented A3c Assemblies R In climate zones 5, 6, 7 and 8, any air- impermeable insula1on shall be a vapor retarder, or shall have a vapor retarder coa1ng or covering in direct contact with the underside of the insula1on. (New to 2009) 5. Either Items 5.1, 5.2, or 5.2 shall be met: (Not in 2006 IRC) 5.1 Air- impermeable insula1on only. Insula1on shall be applied in direct contact with the underside of the structural roof sheathing. 5.2 Air- permeable insula1on only. (Insula1on Must be installed directly below the structural Sheathing with rigid board installed directly above The roof deck. (See Table 806.4) 5.3 Combina1on of air- impermeable and air- permeable insula1on. Air impermeable shall be in direct contact with the underside of the roof sheathing for condensa1on control. Air permeable shall be directly below the air- impermeable insula1on. Unvented A3c Assemblies R Air- impermeable insula1on only. Insula1on shall be applied in direct contact with the underside of the structural roof sheathing.
10 Unvented A3c Assemblies R Air- permeable insula1on only. (Insula1on Must be installed directly below the structural Sheathing with rigid board installed directly above The roof deck. (See Table 806.4) Unvented A3c Assemblies R806.4
11 Unvented A3c Assemblies R Combina1on of air- impermeable and air- permeable insula1on. Air impermeable shall be in direct contact with the underside of the roof sheathing for condensa1on control. Air permeable shall be directly below the air- impermeable insula1on. Changes to the 2012 IRC No interior CLASS I vapor retarders are installed on the ceiling side (a3c floor) of the unvented a3c assembly. In climate zones 5, 6, 7 and 8, any air- impermeable insula1on shall be a CLASS II vapor retarder, or shall have a CLASS III vapor retarder coa1ng or covering in direct contact with the underside of the insula1on. New Sec1on 5.4 Where preformed insula1on board is uesd as the air- impermeable insula1on layer, it shall be sealed at the perimeter of each individual sheet interior surface to form a con1nuous layer
12 IRC VR Classifica1on Class I: Sheet Polyethylene, unperforated aluminum foil Class II: Kraa- faced fiberglass Class III: Latex or enamel paint Do Cathedralized A3cs Work? First, lets think about this: The main role for a cathedralized attic is to create conditioned space for ductwork:
13 Do Cathedralized A3cs Work? The differences in annual heating and cooling for the cathedralized and well-ventilated conventional attics have economic consequences. Heat flow up through the attic floor during heating must be replaced by the heating system to maintain acceptably comfortable conditions in the living space. Heat flow down through the attic floor during cooling must be removed by the air-conditioning system to do the same. Conditioned attics increases space that needs to be conditioned. Do Cathedralized A3cs Work? Adding conditioned space comes at a price. The total costs at each location and for each attic insulation level in Figure 5 for the cathedralized attic are consistently higher than those in Figure 6 for the well-ventilated conventional attic with no ducts.
14 Do Cathedralized A3cs Work? The cost addition for a cold climate is about 1.5 cents a square foot. The cost addition for a hot climate is about 2.5 cents a square foot. The total costs at each location and for each attic insulation level in Figure 5 for the cathedralized attic are consistently higher than those in Figure 6 for the well-ventilated conventional attic with no ducts. Do Cathedralized A3cs Work? Well-ventilated conventional attics without ducts require about 40% less annual cooling than cathedralized attics with the same insulation level for the six locations. This is attributed to the favorable effects of ventilation with outside air of the air space above the ceiling insulation. The lesson: 1. Highly ventilate attics because it is the process of ventilation that reduces heat gain from attics and saves energy. So for a cooling climate, a conventional attic is better than a cathedral attic.
15 Do Cathedralized A3cs Work? Well-ventilated conventional attics without ducts are marginally better regarding energy for heating than cathedralized attics with the same insulation level. The lesson: 1. Conditioned attics with heat ducts use about the the same energy (a bit more) as conventional attics with no ducts. The key to savings is taking the ductwork out of the conventional attic. So for a heating climate, the cathedral attic doesn t save energy, it is the process of taking the ducts out of the ventilated attic that saves. Do Cathedralized A3cs Work? Ducts in a ventilated conventional attic cause a significant heating penalty, even if they are leakfree. Placing heating ducts in conventional attics is not a good idea. The lesson: Don t put heating ducts in a conventional attic!
16 Take Aways 1. In hot climates, don t put ductwork in conventional attics! 2. In cold climates, don t put ductwork in conventional attics! 3. Cathedral attics really don t provide a significant gain to energy efficiency but taking ducts outside the conventional attic does. The cathedral attic has the downside of adding space to the home that must then be conditioned. Design Approaches
17 Design Approaches Inverted Soffit
18 Dropped Soffit Scissor Truss with False Ceiling
19 Insulated Storage Truss Open Web Floor Truss
20 Condi1oned Crawlspace Crawlspace Walls Unvented (i.e. mechanically ven1lated or condi1oned) 2. Vented (i.e. passive ven1la1on)
21 IECC Unvented Crawlspace Or (2006) Crawl space walls. As an alterna1ve to insula1ng floors over crawl spaces, crawl space walls shall be to be insulated when the crawl space is not vented to the outside. Crawlspace Walls Unven1lated Crawlspace 2009 IRC 408.3, 2012 IRC Continuously operated mechanical exhaust ventilation at a rate equal to 1 cubic foot per minute for each 50 square feet of crawlspace floor area, including an air pathway to the common area (such as a duct or transfer grille), and perimeter walls insulated in accordance with Section N (2009) N (2012)
22 Crawlspace Walls Condi1oned Crawlspace IRC Conditioned air supply sized to deliver at a rate of 1 cfm per 50 square feet of underfloor area including a return air pathway to the common area (such as a duct or transfer grille), and perimeter walls insulated in accordance with Section N (2009) N (2012) Unvented Crawlspace Requirements The crawlspace ground surface must be covered with a con1nuous Class I vapor retarder (e.g., plas:c shee:ng). Crawlspace walls must be insulated to the R- value required for crawlspace walls (IECC Table ). Crawlspaces must be mechanically vented (1 cfm exhaust per 50 G 2 ) or condi1oned (heated & cooled per building). (See Sec1on R408.3 of the IRC).
23 Helpful Informa1on Unvented Crawlspace IRC and IECC (2009) (2012) Transfer grille or duct air pathway to house Crawlspace Vapor Retarders IECC or (2012) Installation Overlap joints by 6 inches Tape or seal all joints Extend vapor retarder a minimum of 6 inches up the stem wall (more is better) Attach vapor retarder to the stem wall Seal to all piers and other penetrations (recommendations)
24 Crawlspace Vapor Retarders Completely cover all penetrations Seal to stem wall Overlap and seal seams Nail with washer Crawlspace Insula1on Insulation Installation Must cover both the rim joist and surface of the stemwall Installation should last the life of the house Fiberglass batt Should not be compressed Friction fit with no mechanical attachment will not last Rigid board insulation (closed cell) Sprayed-on Insulation certification
25 Crawlspace Ven1la1on Systems Fan Exhaust Exhaust air to outside the crawlspace Route exhaust air to avoid exposing people if high radon levels Condi1oned Crawlspace Requirements Requires return air path to common area. Transfer grille or duct air pathway to house
26 Crawlspace Make up air Loca1ons Transfer grills through wall Transfer grills through subfloor Fan Location Crawlspace Make up air Sizing Code Compliant Construction Details Amount of air required Minimum hole size Maximum hole size 0-10 CFM 1.5 sq in. 2.4 sq in CFM 2.4 sq in. 3.6 sq in CFM 3.6 sq in. 4.4 sq in. The IRC does not specify the size of the make up air opening. This table was taken from a Department of Energy Building Energy Codes Resource Center Paper from Colorado amendments to the IRC.
27 Building America Condi1oned Crawl Building Science Condi1oned Crawl
28 Resources International Residential Code: International Residential Code Energy Design Update 4. Building America: residential/ba_index.html 5. U.S. Department of Energy Building Energy Codes publications:
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