[Bldg-sim] 90.1 Section 5.6 envelope trade off

Nick Caton ncaton at smithboucher.com
Fri Jun 15 08:38:44 PDT 2012

Hi Chris,

If it's any help, I understand COMcheck is still being actively updated as I get notifications pretty often re: updates.  Considering COMcheck is inclusive of a fairly wide range of standards, some of which are state/locality-specific, you might find the folks responsible for updating/developing the software receptive to including another set of prescriptive standards if you ask the question.

Best of luck!


[cid:489575314 at 22072009-0ABB]


Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Chris Jones
Sent: Friday, June 15, 2012 8:28 AM
To: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] 90.1 Section 5.6 envelope trade off

Again the problem wit COMcheck is the prescribed envelope characteristic don't match the new Ontario Building Code values.  It is unfortunate that COMCheck and ENVSTD have those values hard coded.  It would have been great if those programs had been constructed with a database that was open for revision based on the local jurisdictions requirements.

I have found a volunteer to help develop a WEB based solution.  Don't hold you breath, it is a spare-time project.

At 05:01 PM 14/06/2012, Gowri, Krishnan wrote:

Nick is right, COMcheck is based on Appendix-C envelope trade-off equations.  It uses Appendix-A U-factor calculation methods for all recent 90.1 versions and state codes based on 90.1.  I do not know of any active updates to ENVSTD, so you may want to consider using COMcheck for trade-off compliance.

COMcheck (desktop/web) software and technical support documents are available at:  http://www.energycodes.gov/software.stm#tabs-2

Krishnan Gowri, Ph.D.
Pacific Northwest National Laboratory

From: Nick Caton [ mailto:ncaton at smithboucher.com]
Sent: Thursday, June 14, 2012 12:26 PM
To: Chris Jones; Christian Cianfrone
Cc: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: Re: [Bldg-sim] 90.1 Section 5.6 envelope trade off

If I?m not mistaken, the trade-off approach is what COMcheck?s (free software) is built around for envelope compliance calculations.  Don?t believe it gets much easier ;).


Christopher Jones, P.Eng.
Suite 1801, 1 Yonge Street
Toronto, ON M5E1W7
Tel. 416-203-7465
Fax. 416-946-1005
email cj at enersave.ca<mailto:cj at enersave.ca>
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