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Review Comments: Prescriptive Below Grade Wall Insulation Requirements

Document Title

BSR/ASHRAE/IESNA Addendum bb to ANSI/ASHRAE/IESNA Standard 90.1-2007, Energy Standard for Buildings Except Low-Rise Residential Buildings (First Public Review Draft)  

Title

Prescriptive Below Grade Wall Insulation Requirements 

Comment Number

003 

Comment Type

Substantive 

Commenter Number

0017 

Component Identifier

5.5 

Component Type

Table 

Date Submitted

5/4/2009 11:17 AM 

Supportive

No 

Comment Text

The prescriptive below-grade insulation requirements for CZ 5-8 are too high and should more in line with the established advanced energy design guides and the NBI Core Performance. Change as follows:

CZ5 - 7.5ci
CZ6 - 7.5ci
CZ7 - 10ci
CZ8 - 15ci

Substantiating Statements_0

 

Responses

Responses 

Comment Approval Date

 

Comment Status

Responded To 

Affiliation

 

Last Action

 

Last Action Request Further Contact

 

Last Action Type

New Comment 

Response Status

Response Approved 

Review Period

 

Start Date

 

End Date

 

AuthorSave

ncotton@ncma.org 

ModifiedBySave

ncotton@ncma.org 

Assigned Responder/SC/WG

 

Committee Response

Rejected 

Reply Status

 

Commenter Reply

 

Late Comment

 

ANSI Comment

 

Committee Title

SSPC090.1 

Draft Comment

 

Committee Tag

 

Response Sent

 

Substantiating Statements

1 - The proposed prescriptive requirements are an excessive increase in r-value especially when compared against established advanced energy design guidelines (AEDG). The highest r-value requirement in the AEDGs is 15.2 and then only in CZ7&8. This current process for measuring the cost effectiveness of a measure needs to be revisited, since it does not take into account the interactions between different energy measures. Stuffing excessive amounts of material into a structure is not necessarily any more sustainable than not having enough. Also values are a result of extrapolation. The values from the AEDG are a much more reasonable than those proposed.

2 - Due to age of the criteria equations, early 1990's, when the highest value of insulation was 15.2, the generated value of 19.5 is not cost effective when compared against the potentially low energy efficiency benefit.
Attachments
Content Type: Review Comment
Created at 5/4/2009 11:17 AM  by nacotton@comcast.net 
Last modified at 6/19/2011 12:15 AM  by oldtownit