CBECC-Res / Tickets / #72 Add Radiant Barrier option for Cathedral Ceiling Construction

Bruce Wilcox - 2013-04-12

Originally posted by: bruceawi... (code.google.com)@gmail.com

Actually it is quite different than the attic roof. The Radiant Barrier is applied to the bottom of the wood Roof Deck layer and there needs to be an air space there above the insulation to make it work. Need to add the air space layer to this construction and give it an R that depends on whether there is a Radiant Barrier or not.

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Ken Nittler - 2016-02-22

Status: Accepted --> Retired2013
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Ken Nittler - 2016-02-24

Description has changed:

Diff:

status: Retired2013 --> New

Priority: High --> Low

Type: Comp.Error --> Enhancement

Version: --> 2013&2016

Milestone: --> TBD
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Ken Nittler - 2016-02-24

DeeAnne requested that we restore this one. It is a problem because there is no attic model on a cathedral ceiling. But perhaps we could implement the old U-factor based algorithm that was used for some years to recognize at least some credit for adding radiant barriers when there is an air space. I've had this request from EAA users as well.

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Dee Anne Ross - 2019-03-12

Priority: Low --> High

Version: 2013&2016 --> 2019

HERS: --> TBD

Milestone: TBD --> 2019.next
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Scott Criswell - 2019-07-11

Priority: High --> Medium
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summary: Need Radiant Barrier on Cathedral Ceiling Construction --> Add Radiant Barrier option for Cathedral Ceiling Construction
Description has changed:

Diff:

--- old
+++ new
@@ -1,8 +1,9 @@
+Include the option to model radiant barrier in a cathedral roof construction data.
+
+Old language:
 *Originally created by:* [bruceawi...@gmail.com](http://code.google.com/u/113654714935778150836/)
 *Originally owned by:* [bruceawi...@gmail.com](http://code.google.com/u/113654714935778150836/)

 CBECC-Res 2013-0t \(324\)

 Just like on attic roof construction
-
-**What steps will reproduce the problem?**

assigned_to: Bruce Wilcox --> Scott Criswell
Attachments has changed:

Diff:

--- old
+++ new
@@ -1,2 +1,3 @@
 Cathedral.PNG (111.7 kB; image/png)
+Cathedral.ribd19 (63.6 kB; application/octet-stream)
 RadBar.PNG (106.3 kB; image/png)

Priority: Medium --> Critical
HERS: TBD --> Unaffected
Milestone: 2019.next --> 2019.2.0

Dee Anne Ross - 2020-04-13

Revising this ticket to include radiant barrier on a cathedral roof to be included in next version.

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Diane Pepetone - 2020-08-05

I checked the CF1RPRFschema for the radiant barrier (true/false) data and found it is collected in 3 sections: Attic, Attic Verified and Altered and Cathedral Ceiling Verified and Altered.

From other entries in this ticket it sounds like it should be added to Opaque Surface Constructions section and labelled "Cathedral Ceiling Radiant Barrier" and only required if Surface Type (Q02) is Cathedral Ceiling - is that correct? Or does it go somewhere else?

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Scott Criswell - 2020-08-11

assigned_to: Scott Criswell --> Bruce Wilcox
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Scott Criswell - 2020-08-11

action planned in week of 8/17-21

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Scott Criswell - 2020-08-25

status: New --> Fixed
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Scott Criswell - 2020-08-25

Ruleset & UI updates checked into SVN @ r1913

radiant barrier checkbox added to cathedral ceiling cons dialog

when selected, massless resistance layer (1.2 inch thick, R-2.7) inserted between the roof deck and cavity framing/insulation layers

documented as "Radiant Barrier" material layer in CF1R Assembly Layers column of Opaque Surface Constructions table
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Scott Criswell - 2020-08-28

additional ruleset mod checked into SVN @ r1923
radiant barrier layer removed from frame path constructions (for cathedral ceilings - per guidance from BAW)

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Dee Anne Ross - 2020-09-11

status: Fixed --> Verified
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Add Radiant Barrier option for Cathedral Ceiling Construction

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#72 Add Radiant Barrier option for Cathedral Ceiling Construction

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