Jerry Needham
  • Geneva, IL
  • United States
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VERY TIGHT HOME WITH OVER SIZED AC

Started this discussion. Last reply by Dave Taylor on Thursday. 6 Replies

Just completed an audit and manual j for a home in downtown Chicago this week.  Home is less than 1 year. 5 stories include basement.  Block walls with brick over.  Closed cell entire wall bays.  2…Continue

Condensation on ceiling and walls of master bedroom

Started this discussion. Last reply by Rich Manning Jul 19. 8 Replies

Posted on wrong thing first time.  Have cust who claims to have condensation on ceiling in summer time.  has 2 ac... has approx 3,000 sf two story built 1978 mst br is only room with cathedral…Continue

Closed cell on roof deck to prevent mold.

Started this discussion. Last reply by Scott Partlo Apr 20. 3 Replies

I am working with an insulation company who has already applied 2" of closed cell foam over the deck of a roof deck that has been remediated for mold twice. It was thought by spraying the foam, there…Continue

 

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Latest Activity

Dave Taylor replied to Jerry Needham's discussion VERY TIGHT HOME WITH OVER SIZED AC
"Jerry, you should look at Buildingscience.com" High Mass Walls" 105 paper for more documentation for your owner."
Thursday
Tim O'Brien replied to Jerry Needham's discussion VERY TIGHT HOME WITH OVER SIZED AC
"New build may not have been "dry" before finished and occupied. Residual moisture from materials may have been "stranded" leading to localized high moisture areas causing problems. Need to add dehumidifier for cooling season if…"
Monday
Daniel Baur-McGuire replied to Jerry Needham's discussion VERY TIGHT HOME WITH OVER SIZED AC
"Oversized A/C systems wont pull out enough moisture from the conditioned air. I would check to make sure the systems are set to the right fan speed. Make sure the filters are clean and appropriate for the filter rack. No merv 12 in a 1inch filter…"
Monday
John Nicholas replied to Jerry Needham's discussion VERY TIGHT HOME WITH OVER SIZED AC
"AC sizing and design is always a compromise.  The homeowner in this case is stuck on numbers.   What did the original HVAC design contractor say about their Manual J and D?  Why so oversized from their point? Pull the ASHRAE…"
Aug 9
David Baerg replied to Jerry Needham's discussion VERY TIGHT HOME WITH OVER SIZED AC
"I'm curious if the humidity problems are winter or summer.  Is the mold forming on the back of the drywall or on the inside?  With 2 HRVs, I wouldn't expect they have high humidity in the winter.  But they might not be using…"
Aug 9
Dave Taylor liked Jerry Needham's discussion VERY TIGHT HOME WITH OVER SIZED AC
Aug 6
Dave Taylor replied to Jerry Needham's discussion VERY TIGHT HOME WITH OVER SIZED AC
"Jerry, Your second line may be the key. "Brick over block" I think you may be experiencing vapor pressure drive thru the wall assembly. The oversize AC acts as a giant vacuum drawing the Heat and moisture to it thru the walls. Mold forming…"
Aug 6
Jerry Needham posted a discussion

VERY TIGHT HOME WITH OVER SIZED AC

Just completed an audit and manual j for a home in downtown Chicago this week.  Home is less than 1 year. 5 stories include basement.  Block walls with brick over.  Closed cell entire wall bays.  2 ACs of 3.5 tons each. 1 in basement for 3 zones and one on 2nd floor with 2 zones.  HRV with each system.  All Carrier Infinity equip.  Man j calls for 30,704 Btu for total AC. Blower Door was at 2.5 ACH50.  They have experienced mold in the window cavities & builder is in process of taking out…See More
Aug 2
Rich Manning replied to Jerry Needham's discussion Condensation on ceiling and walls of master bedroom
"Looks like a leaking ridge vent"
Jul 19
Daniel Baur-McGuire replied to Jerry Needham's discussion Condensation on ceiling and walls of master bedroom
"Sounds like u opened the hornets nest! I would say a 2600 sq ft home shouldn't need more than 2tons a/c depending where u are at. More tonnage can cause issues. Especially makes it difficult for the system to pull moisture out of the air of it…"
Jul 16
Jerry Needham replied to Jerry Needham's discussion Condensation on ceiling and walls of master bedroom
Jul 14
Sean Lintow Sr replied to Jerry Needham's discussion Condensation on ceiling and walls of master bedroom
"The problem was probably there before, it just wasn't as apparent - sure rain isn't getting in through said ridge also? Love hot roof systems especially when you have so little room for traditional means - just make sure it is closed cell…"
Jun 1
Jerry Needham replied to Jerry Needham's discussion Condensation on ceiling and walls of master bedroom
"Thanks for the reply Daniel.  I have worked with several jobs where we did as you suggest and all seem to be good.  I like the concept of the un-vented foam filled cathedral ceiling.  Cust says no issues with the condensation prior to…"
Jun 1
Jerry Needham replied to Jerry Needham's discussion Condensation on ceiling and walls of master bedroom
"David Not sure if there are any supply vents in the ceiling.  I am scheduled for an energy audit on June 18th and will know a lot more about the house at that point.  Just trying to get ahead of the curve prior to getting to the house."
Jun 1
Daniel Baur-McGuire replied to Jerry Needham's discussion CONDENSATION ON CEILING AND WALLS OF MASTER BR
"Spray closed cell foam and get rid of soffit venting. Problem fixed! Adding soffit vents just allowed hot moist air to hit, I assume, an underinsulated and non air sealed space. Doubt they actually vented the space with baffels all the way up the…"
May 31
David Butler replied to Jerry Needham's discussion CONDENSATION ON CEILING AND WALLS OF MASTER BR
"Is it the cathedral ceiling that's sweating? Is the condensation on or adjacent to supply vents?"
May 31

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Jerry Needham's Blog

Spray foam on attic deck to stop mold

Posted on April 7, 2018 at 8:57pm 2 Comments

I am working with an insulation company who has already applied 2" of closed cell foam over the deck of a roof deck that has been remediated for mold twice. It was thought by spraying the foam, there would be no chance of the mold coming back.  This is a million dollar home in the Chicagoland area and homeowner is trying to sell the home but a private home inspector says the foam will shorten the life of the roof and he has scared off perspective buyers with his talk.  I have told the…

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At 11:37am on January 1, 2014, Diane Chojnowski said…

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Forum Discussions

VERY TIGHT HOME WITH OVER SIZED AC

Started by Jerry Needham in BPI. Last reply by Dave Taylor on Thursday. 6 Replies

Mini split air conditioners and ceiling fans

Started by Beverly Lerch in General Forum. Last reply by Daniel Baur-McGuire on Monday. 4 Replies

DIY Filter Solution for an Evaporative Cooler, anyone?

Started by Leslie Jackson in HVAC. Last reply by Daniel Baur-McGuire on Monday. 6 Replies

Apply now for the Jon Siemen Memorial Scholarship!

Started by Diane Chojnowski in General Forum. Last reply by Quinn Korzeniecki Aug 9. 1 Reply

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"Jerry, you should look at Buildingscience.com" High Mass Walls" 105 paper for more…"
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