SLAB ON GRADE CONSTRUCTION

Meeting the MN Energy Code ( air tightness)

for 2017

Energy Design Conference By

MikeD.WilsonDakotaSupplyGroup

•  InaccordancewiththeDepartmentofLaborandIndustry’sstatute326.0981,Subd.11,“ThiseducaJonalofferingisrecognizedbytheMinnesotaDepartmentofLaborandIndustryassaJsfying1.5hoursofcredittowardBuildingOfficialsandResiden6alContractorscode/energyconJnuingeducaJonrequirements.”ForaddiJonalconJnuingeducaJonapprovals,pleaseseeyourcredittrackingcard.

LearningobjecJves

1.  Overviewofthe2015MNEnergyCoderegardingbuildingJghtnessandducJng/tesJngrequirements

2.  Learnaboutcommonareasthatareoverlookedwhenitcomestoairsealing

3.  GainanunderstandwheretosealandwhattousewhenairsealingthatwillhelpyouachieveaJghterhouse.

4.  FindoutwhatisthebestJmeduringconstrucJontodoablowerdoortestandaductblastertest

5.  LearnaboutthedifferentHVACdesignopJonforslabongradeconstrucJon

6.  GaininformaJononwhenyouneedtodoaductleakagetestandhowtopassthattest.

7.  LearnaboutbalancedvenJlaJondesigns

Slab on grade twin home

Large slab on grade

Energy codes •  Overviewofthe2015MNEnergyCoderegardingbuildingJghtnessandducJng/tesJngrequirements

•  Code•  Slabongradehalfthehousesmallmetric• Workwithalltrades,insulatorandenergyauditer/blowerdoorguyonairsealing

•  Dowalkthruatframing•  Doablowerdoorwithinfraredcamera•  Traininglearningcurve•  AirsealingisdifferenttheninsulaJng•  Getmoretraining,onsite

Code language R402.4.1.2 Testing

•  Thebuildingshallbetestedandverifiedto3AirChangesperHourorless

• Conductedwithcalibratedblowerdoorto50Pascals• CodeOfficialmayrequireapprovedthirdpartytodothetest• AsignedwriaenreportofresultbeneedstobesuppliedThisisforallnewhomes,weknowhowtomeetthesestandards,somebuildershavebeenmeeJngtheselevelfor25plusyearsComfort,energysavings,durability,goodIAQ,resaleandmorearewhythisisacode

Who can do a blower door test, duct leakage?

Duct blaster print report , leakage %

Building Science Basics

• Heat• Air• Moisture

Air movement

• Airispushedbyhigherairpressuretoareasoflowerairpressure• Airpressuresusuallyresultfrom:

• Wind•  Stackeffect•  Mechanicalfans

Stack Effect PosiJvepressure(relaJvetooutdoors)

NegaJvepressure(relaJvetooutdoors)

NeutralPressurePlane

Air Moves Under Pressure

Temperature Wind Exhaust/Mechanicals

• Convec'on

Building Science Example

• Moldonundersideofroofdecking• What’sgoingon?

www.mold-help.org

Air sealing details

1. Learnaboutcommonareasthatareoverlookedwhenitcomestoairsealing

2. GainanunderstandwheretosealandwhattousewhenairsealingthatwillhelpyouachieveaJghterhouse

Air Sealing Training

19

The Five Important Steps of Air-Sealing

1.  IdenJfytypeofopening2.  Chooseairsealingmaterials3.  Cutand/orfitmaterials4.  Sealtheleaks5.  TesttoairJghtnessstandard

§  Ifyoucouldsinkyourhouseinthelake,woulditholdwater?

Thermal Boundary

Basement

1st floor Garage Sun

room

2nd fl

Thermal Bypass Examples

1.  Vaultedceiling2.  Porchoverhang3.  KneewallraherinsulaJon4.  Chimneychase5.  Canlight

1st Priority- attic air leaks

What type of Construction details to look for

Key details

EPA: Thermal Bypass Guide

MSHINov.2006

VAPOR BARRIER…SEALED LIKE A PLASTIC BAG

Treatments

Sealed Blocking

Wind baffle

Enclose backside with vapor permeable Wind barrier

BuildairJght,recessedlightenclosures

AIR FLOW LEAKAGE( speakers and lights) and DUCT PENETRATION FROM ATTIC

How many air leakage details in this picture

Key Detail: Porch framing on two-story

Key Detail: Level changes

House to garage connection

MSHINov.2006

Garage

Pla=ormReturn

Supply

AirHandler

ReturnGrille

LeakinReturnPla=orm

+Pressure

ReturnLeaksFromOutsidePressurizeHouses

AHc

Duct penetration

Wiring air bypass

Window and Door jambs

Seal joint floor to plate, wall, pipe, holes in floor

Air inlet system ?

Insulation and air sealing types

• Alotofstuffonthemarket-discussionTalktopeoplethatdotheblowerdoortest,insulators,andothersbuildersthatpassthetest

StateofMinnesotaBuildingOfficials1-2007

Testing and Site Verification

Blower door test when ?

• Ahersheetrockisup?• Whenhouseisatfinal?• Whentradesarealldonewiththerework(holes)

Duct sealing ( mandatory )

• Alljointsneedtobesealed• BuildingcaviJescan’tbeusedasducts

Mastic vs tape

•  IthasbeenproveninmanyprogramsthoughtoutthecountryandperformancetesJngovermanyyearsthatmasJcisbeaersealingtheductworkwhendoingtheairJghtnesstesJngontheductsystem

•  SpreadthemasJconnickelthick..Withbrushisgenerallythebest•  TomyunderstandingnotapemeetstheUL181(AorB?)lisJng•  Talktoyourinspector

Mastic and Tape , Ducting sealing

•  SomeciJeswillbeallowingtape,askyourinspector•  ClosuresystemsusedtosealductworklistedandlabeledinaccordancewithUL181Ashallbemarked“181A-P”forpressure-sensiJvetape,“181A-MformasJc….Thiswillbeallowed

•  FROMNATIONALEXPERIECEIFYOUHAVETODOTHEDUCTLEAKAGETESTYOUBETTERUSEDUCTMASTIC!!!

Testing of Duct System… Air Tightness of Complete Duct System… Duct Blaster Test • Bothreturnandsupplyshallbetestedifductworkisoutsidethermalbuildingenvelope

•  TwoopJonsfortesJng1.  Roughintest,whenductworkiscompletebutfurnacecabinethasnot

beeninstalled2.  PostconstrucJon,thisiswhenfurnacecabinethasbeinstalled

Option one at rough in

•  Findairleaksearly• Whoisgoingtodothetest?•  TestonesideataJme•  0.03xsq.h.ofcondiJonarea•  Example3000h.=90cfmleakage• Veryfewpeoplearetalkingaboutthismethod•  Thisisnowthenorm

Option two when ducting and furnace installation is complete • Hardtofindandsealairleaks• Whoisgoingtodothetest?•  0.04xsq.h.ofcondiJonarea•  Example3000h.would=120cfmofleakage•  Systemwearedoingtoday700to2000cfmleakage•  Systemnowhavetobebetween15andmaybe200

Cover supply and return covered with card board

Foam plugs

Mechanical options

•  LearnaboutthedifferentHVACdesignopJonforslabongradeconstrucJon

TypeHeaJngandCoolingØ Forcedair

o Furnaceo MinisplitDuctedandDuctlesso Geo

Ø Radianto Boiler….Gas-LP-Electrico Electriccable

Mechanical options TypeVenJlaJonbalancedØ DuctedtofurnaceØ FullyductedDuctdesignØ ArcØ DropceilingsoffitØ Transite(undergroundductwork)Hotwater(DHW)Ø IntegratedØ IndependentØ Gas–ElectricHumiditySummerandWinter

Small mech. Rooms are tough to get equipment in …. Work with HVAC trade

90 % two pipe furnace

Pla=ormReturn

Supply

AirHandler

ReturnGrille

AHc

-

Duct design in attic or within shell

Forced air duct work in the attic

Drop ceiling for duct work

High V

Central supply grills that are on interior walls

Single return filter grills

Waterintheductworkbelowslab

Quiet one sone bath fan

Small Hrv , general duct design

RADIANT HEAT WITH A BOILER OR ELECTRIC CABLE

Ductless Cooling & Heating

• Verycost-effecJvemethodofaddingcoolingtoexisJnghomewithoutforcedairoraddiJon

• Uptothree-zonecapability• WithnewInverterHeatPumptechnology,heaJngcanbeaddedtoanaddiJonwithelectricbaseboardbackupwhereothermethodswillnotwork

DUCTLESS AC AND HEAT

HIGH SIDE WALL MINI SPLIT WITH FULLY DUCTED VENTILATION

DUCTED MINI SPLIT, IN MECH. ROOM

DUCTED MINI SPLIT WITH BALANCED VENTILATION

Direct vent fireplace

New 65 pint dehumidifier

VENTILATION DUCT DESIGN HRV/ERV

•  Sourcepoint• GeneralvenJlaJon• Return-return• Return-supply•  Fullyducted

FULLY DUCTED

§ For non-forced air heating systems

§ Exhaust from bathrooms & kitchen

§ Supply to bedrooms & main living areas

§ Optimum air quality control

SOURCE POINT DESIGN AND BATH FANS • DEPENDINGONDUCTLENGTH,TYPEANDSIZEOFTHEBATHROOMONEMAYUSEHRV/ERVASBATHROOMEXHAUSTSYSTEM…5TO6ACH.NOBATHFANNEEDED•  ZONINGOFHRV/ERVISANOPTION• ANEXHAUSTPOINTFROMHRV/ERVANDBATHFANINTHESAMEBATHROOMISANOPTION

DESIGN DETAILS

•  THEREISALOTOFEXPERIECEANDHISTORYONHOWSYSTEMAREINSTALLED….LOWESTCOSTISNOTALLWAYSTHEBESTOPTION,THEINDUSTYIS30PLUSYEARSOLD,REVIEWTHESEDESIGNSWITHSOMEONETHATHASDIRECTEXPERIECEWITHALLTHESEVENTILATIONDESIGNS,SITDOWNWITHANHVACPROFESSIONALANDREVIEWYOUROPTIONFORTHEHOMESTHATYOUAREBUILDING

Thank you for your time • MikeD.Wilson,presenter• DakotaSupplyGroup•  612-597-3395• mwilson@dsginc.biz