Forum discussion

NC-2009 EAp2: Minimum Energy Performance

See LEEDuser’s guidance on NC-2009 EAp2 »

Existing building renovation - unknown existing envelope

February 11, 2015

Ron Dean

Sumac Inc.

LEEDuser Basic Member

21 thumbs up

February 11, 2015

Hi,
To do the baseline model envelope I believe I should use the existing one (previous to any alteration). However, they have already demolished the walls/windows so I don't know what was "existing", except for the main structure.

Should I model the walls and windows following Table 5.5 Building Envelope Requirements of ASHRAE 90.1 (i.e. as if it was a new building)?

Thank you.

Post a reply

Marcus Sheffer

LEED Fellow
7group / Energy Opportunities

LEEDuser Expert

5909 thumbs up

February 11, 2015 - 6:25 pm

You certainly could do that but then you get no credit for the existing envelop if it was worse than the 90.1 minimums. it would be a potentially conservative approach and should be accepted.

Alternatively if you had any general information you could use some of the Appendix A tables like A8.2 for windows.

Log in or register to post comments

Add new comment

To post a comment, you need to register for a LEEDuser Basic membership (free) or login to your existing profile.

See all forum discussions about NC-2009 EAp2

Subscribe to new posts about NC-2009 EAp2

Post a new question about NC-2009 EAp2

See LEEDuser’s guidance on NC-2009 EAp2 »

FAQs about EAp2:

Is it acceptable to model a split-type AC with inverter technology compressor as a heat pump, like modeling VRF?

A portion of our building envelope is historic. Can we exclude it from our model?

For an existing building, do I need to rotate the model?

Our project has a large process load—75%. Despite our efforts to make an efficient HVAC design, the cost savings are minimal. What can we do to earn this prerequisite and be eligible for LEED certification? Is there any flexibility in how we model the p

Our process load is higher than 25%. Do we have to justify that?

Our local code references ASHRAE 90.1-2010. Should I use that for my documentation, or 90.1-2007?

Can I claim exterior lighting savings for canopy lighting even though a baseline model cannot include shading elements?

The project is built on a site with existing exterior lighting installed. How should this be accounted for?

Can mezzanines open to floors below be excluded from the energy model?

How do I provide a zip code for an international location?

For a project outside the U.S., how do I determine the climate zone?

For a project outside the U.S., how do I determine the Target Finder score?

Do hotel rooms need automatic light shut-off control?

How commonly are the 90.1 mandatory compliance forms submitted as part of EAp2/EAc1?

The Section 9 space-by-space method does not include residential space types. What should I use?

Can the Passive House Planning Package (PHPP) be used to energy model for LEED?

Can the Trace 700 'LEED Energy Performance Summary Report' by uploaded to LEED Online in lieu of the Section 1.4 tables spreadsheet?

Which baseline HVAC system do I use if my building has no heating or air conditioning?

Our project has a diesel backup generator. Should we include it in our energy model?

Can SHGC be higher in the proposed than in the baseline model?

View answers »