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Door(s) to unconditioned space

Mike Watterson

Registered User
Joined
Feb 22, 2021
Messages
4
Location
Athens, Ohio
Just completed most of the framing for a master suite (single story ranch addition). Also, part of the addition is a 12'x16' office space that has an unconditioned room on each side that will be used as "attic" storage, although this is technically not an attic. It will be unheated and un-insulated. I live in the Seacoast area of New Hampshire and I am trying to figure out what is required by code. I would like to purchase and install solid pine six panel doors that I will weather strip. I do not want to install "exterior doors" for cost and to avoid the look of having an exterior door in an interior location (office space). Does anyone know if this solution will meet code?
 

classicT

Sawhorse
Joined
Aug 2, 2017
Messages
1,692
Location
Washington State
I do not see that New Hampshire has amended Table R402.12, and I believe you will fall under Climate Zone 6....

So as long as the door that you install has a U-Factor of 0.32 or better, you should be ok. May be hard to get with a solid core door though.
 

Mike Watterson

Registered User
Joined
Feb 22, 2021
Messages
4
Location
Athens, Ohio
Just completed most of the framing for a master suite (single story ranch addition). Also, part of the addition is a 12'x16' office space that has an unconditioned room on each side that will be used as "attic" storage, although this is technically not an attic. It will be unheated and un-insulated. I live in the Seacoast area of New Hampshire and I am trying to figure out what is required by code. I would like to purchase and install solid pine six panel doors that I will weather strip. I do not want to install "exterior doors" for cost and to avoid the look of having an exterior door in an interior location (office space). Does anyone know if this solution will meet code?
Thanks for the quick response. I'm in climate zone 5 Southern NH so I believe that means we need to get a U-value of .48 Your response allowed me to find the answer in ICC 2015 code. This was very helpful.
 

steveray

Sawhorse
Joined
Nov 25, 2009
Messages
8,043
Location
West of the river CT
There is typically a U factor exemption for 1 door, but it needs to be weatherstripped...

N1102.3.4 (R402.3.4) Opaque door exemption. One sidehinged
opaque door assembly up to 24 square feet (2.22
m2) in area is exempted from the U-factor requirement in
Section N1102.1.2. This exemption shall not apply to the
U-factor alternative approach in Section N1102.1.4 and the
total UA alternative in Section N1102.1.5.
 

jail

Registered User
Joined
Jan 16, 2021
Messages
16
Location
NH
What I do in this situation is install two doors. An interior in swing that matches the homes interior doors, and an exterior out swing cheap insulated steel going into the unconditioned space. If you go with just the interior door you will have a cold drafty master suite.
 

Mike Watterson

Registered User
Joined
Feb 22, 2021
Messages
4
Location
Athens, Ohio
What I do in this situation is install two doors. An interior in swing that matches the homes interior doors, and an exterior out swing cheap insulated steel going into the unconditioned space. If you go with just the interior door you will have a cold drafty master suite.
Thanks Jail for your suggestion and advice about the room being cold and drafty. I can't have an in swing door because the door is on a cheek wall of a dormer and would hit the bottom of the rafters. The goal was to meet code for inspection. I plan to insulate the unconditioned closet and use weather stripping on the door. If I insulate prior to inspection, the interior room could be counted as a bedroom which it isn't and will not be used as such. Thanks much.
 

rogerpa

Silver Member
Joined
Nov 5, 2009
Messages
302
If I insulate prior to inspection, the interior room could be counted as a bedroom which it isn't and will not be used as such. Thanks much.
Says who? The room is whatever you designate on the plans. The inspector cannot look into his crystal ball and say "this could be a bedroom (sleeping room)". If the plans say "office" then it's an office regardless of whether or not you insulate the "attic" storage.
 

Mike Watterson

Registered User
Joined
Feb 22, 2021
Messages
4
Location
Athens, Ohio
Says who? The room is whatever you designate on the plans. The inspector cannot look into his crystal ball and say "this could be a bedroom (sleeping room)". If the plans say "office" then it's an office regardless of whether or not you insulate the "attic" storage.
From my past experiences as a contractor in Massachusetts this was a sticking point on two different occasions. I found that rather than arguing with an obstinate inspector, it's better to try to "get along" and not invite unwanted or inquiries.
 
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