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30
9
Chase Installations
Ceiling
Firestop
Metal Chase Top
Round Termination Cap
False Ceiling
Insulation in the
outside walls
of the chase
Attic
Insulation
Shield
Chimney
Ceiling
Firestop
Tabs
False Ceiling
False Ceiling
Insulation
Insulation
Figure 9.1 Chase Assembly
1 2 3
1. Fireplace and chimney enclosed in an exterior chase.
2. Chimney offset through exterior wall and enclosed in chase.
3. Chase constructed on roof.
Note: In cooler climates, all chase walls should be insulated.
Figure 9.2 Chase Constructions
WARNING! You must install false ceilings and ceiling
restops at each oor of the chase or every 10 ft (3.05 m)
to control spread of re.
WARNING! Risk of Fire!
You must maintain a minimum
2 in. (51 mm) air space clearance to insulation and other
materials surrounding the chimney system.
• Insulation and other materials must be rmly secured to
prevent accidental contact with chimney system.
• The chase must be properly blocked to prevent blown
insulation or other combustibles from entering and
making contact with replace or chimney.
• Failure to prevent contact between insulation or other
materials and chimney system may cause overheating
and re.
WARNING! Risk of Fire! DO NOT seal area between re
stop opening and chimney pipe except where they enter
the attic or leave the warm air envelope of the home (use
600° F sealant).
A. Construct the Chase
Achaseisaverticalboxlikestructurebuilttoenclosethe
replaceand/oritsventsystem.Verticalchimneysthat
runontheoutsideofabuildingmustbeinstalledinsidea
chase.
Constructionofthechasemayvarywiththetypeofbuild-
ing.Theseinstructionsarenotsubstitutesfortherequire-
mentsoflocalbuildingcodes.LocalbuildingcodesMUST
bechecked.
Achaseshouldbeconstructedinthemannerofall
outsidewallsofthehometopreventcoldairdrafting
problems.Thechaseshouldnotbreaktheoutsidebuild-
ingenvelopeinanymanner.Allouterwallsneedtobe
insulated.
Buildingcodesrequirefalseceilingandceilingrestops
ateachoorofthechaseorevery10ft(3.05m)ofclear
spacetocontrolspreadofre.
Walls,ceiling,baseplateandcantileveroorattherst
levelofthechaseshouldbeinsulated.SeeFigure9.1.
Vaporandairinltrationbarriersshouldbeinstalledinthe
chaseasperregionalcodesfortherestofthehome.Ad-
ditionally,Hearth&HomeTechnologiesrecommendsthat
theinsidesurfacesbesheetrockedandtaped(ortheuse
ofanequivalentmethod)formaximumairtightness.
Gaslineholesandotheropeningsshouldbecaulkedwith
hightemperaturecaulkorstuffedwithunfacedberglass
insulation.Ifthereplaceisbeinginstalledonacement
slab,werecommendthatincoldclimates,asheetof
plywoodorotherraisedplatformbeplacedunderneathto
preventconductingcoldupintotheroom.
ThreeexamplesofchaseapplicationsareshowninFig-
ure9.2.
OutdoorLifestylesbyHearth&HomeTechnologiesInc.•4072-137RevK•10/15
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