Luis Hernandez
  • Rhinebeck, NY
  • United States
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Open cell foam and cellulose... Can they work together?
11 Replies

Greetings everyone!   I have a client who would like to have two inches of open cell foam in the attic flat, and then 10 inches of cellulose. Someone mentioned to you that there were issues in doing…Continue

Tags: foam, cell, open

Started this discussion. Last reply by Richard Beyer Mar 29.

Calculating BTU lost per cfm leaks
23 Replies

Hi everyone,    A couple of my colleagues were discussing the benefits of air sealing, when I was asked if I could quantify the actual value of air sealing based on how many BTU's per CFM(50) of air…Continue

Tags: saving, energy, sealing, air, CFM

Started this discussion. Last reply by Dmitri A Martin Feb 1.

Calculating heat loss
3 Replies

Could anyone help me calculate a breakdown that shows  heat loss in BTU/hour that adds up to 100% and shows % or subtotals for the sub-categories that add up to 100% based on  u values and Area for…Continue

Started this discussion. Last reply by Bud Poll Jan 21.

Searching for suggestions
1 Reply

I did an energy audit on a client and I would like to get some suggestions please.This is my main "problem": 11 year-old home, about 2,000sq living space, around 2,000cfm50. Two floors with basement…Continue

Started this discussion. Last reply by Ed Minch Oct 4, 2013.

 

Luis Hernandez's Page

Latest Activity

Richard Beyer replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Sean thanks for pointing that out. You may have missed my point. If a home has high humidity and you add SPF, it needs to be dehumidified to within published standards. A well balanced HVAC system helps maintain a balanced home. In some homes the…"
Mar 29
Sean Lintow Sr replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Sorry Richard, but that has nothing to do with the HVAC, that had to do with to thin of a layer of foam not meeting the dew point depth required. To top that off I would also state that they probably were not maintaining moisture levels in their…"
Mar 29
Richard Beyer replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"This link show's a risk you face when using closed cell without a balanced HVAC system. Your risk using open cell I described previously. This only shows insulation alone will not eliminate your problems if you do not plan…"
Mar 29
Sean Lintow Sr replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Ahh but we are talking the attic floor & not the roof sheathing, no? As for hot roofs aka encapsulated attics, the issue is dew point considerations & as Richard points out, Lynene spread so much dis-information it made it nearly impossible…"
Mar 29
Richard Beyer replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Guy's this leak stuff is a made up story by a major spfi chemical manufacturer. At that time when the story was flying all over town, this same manufacturer did not have closed cell in it's inventory. People believed it and obviously still…"
Mar 28
Ed Minch replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Sean I am still wondering why we need airsealing in the center of a piece of plywood that is already airtight.  The money would be better spent on a layer of rigid foam on the outside so cut down on thermal bridging and to add R-value."
Mar 28
Sean Lintow Sr replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"I am right there with you Ed but with that many use the open cell to do the air sealing for them & then top it off with cellulose - the system does work great (though it should be 3-4" based on specs / test results & not 2"…"
Mar 28
Ed Minch replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Why not just seal the actual leaks in the attic floor, then blow with cellulose and save a bunch of money?  This is similar to flash-and-batt in exterior walls and I have yet to understand why this is done.  My theory is that the closed…"
Mar 27
Richard Beyer replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Should be 2 inches of closed cell and then cellulose. The closed cell will act as the vapor barrier. Cellulose will act as the flame retardant. Both can work as a system. Most importantly the installer's credentials and insurance must be…"
Mar 26
Luis Hernandez's discussion was featured

Open cell foam and cellulose... Can they work together?

Greetings everyone!   I have a client who would like to have two inches of open cell foam in the attic flat, and then 10 inches of cellulose. Someone mentioned to you that there were issues in doing just that.... I myself cannot imagine what that could be (of course preparing to give the foam enough time to cure)Any comments?Thanks,    LuisSee More
Mar 21
Sean Lintow Sr replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Vapor issue is the only one I can think of though if you use a vapor retarder paint you should be fine & is accepted by many codes (do not use plastic & if it is there remove it) I can't think of any other issues with using it &…"
Mar 21
Jim Peck replied to Luis Hernandez's discussion Calculating BTU lost per cfm leaks
"Yes, and when I cannot sleep I do my own version counting the length of time my FAN runs to reset my internal temp then take into account the current Delta T of the night and then, finally when does the furnace come back on! I obviously need help"
Jan 28
Jon Haehnel replied to Luis Hernandez's discussion Calculating BTU lost per cfm leaks
"Bud, You explained it just fine.  Makes sense. "
Jan 27
Bud Poll replied to Luis Hernandez's discussion Calculating BTU lost per cfm leaks
"I'll just turn Bob's equation around: Q (BTU loss/gain) = 1.08 x CFM (natural) x ▲T (F°) The short explanation is, we need to convert CFM to hours as Graham posted. Multiply by 60 min/hr Then we have to specify the thermal capacity of…"
Jan 27
Bud Poll replied to Luis Hernandez's discussion Calculating BTU lost per cfm leaks
"There is a factor of 60 difference between the answers that Graham is pointing out. Reply by Graham Irwin 2 hours ago Remember to convert CFM (cubic feet per MINUTE) to cubic feet per HOUR (i.e. ft3/hr = CFM/60) if you want an answer in…"
Jan 27
Luis Hernandez's discussion was featured

Calculating BTU lost per cfm leaks

Hi everyone,    A couple of my colleagues were discussing the benefits of air sealing, when I was asked if I could quantify the actual value of air sealing based on how many BTU's per CFM(50) of air leak.  The software does the energy savings calculations of air sealing for my clients, but I was never asked the actual value per BTU. I guess if I could answer that I would have a better understanding of the math behind the savings. Can anyone help me with this? Is there a formula?ThanksLuisSee More
Jan 27

Profile Information

Company
Gaia Sharbel Energy Contracting
Professional Certification
BPI AP, BPI EP, cSBA, IEEE
Professional Interests
Solar passive, sustainable, renewable energy solutions, Energy Star, Energy Audits
Website URL
http://www.loweryourenergynow.com
LinkedIn Profile
www.linkedin.com/pub/luis-hernandez/6/859/9b0/

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At 3:21pm on August 15, 2013, Diane Chojnowski said…

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