Brad Cook
  • Warren, VT
  • United States
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Brad Cook's Discussions

Too many Heat Pump Water Heaters in a basement?

Started this discussion. Last reply by Crista Oct 19. 12 Replies

I recently met with the owner of a local rural inn to discuss performing a comprehensive energy assessment for him. He has been looking at replacing his existing propane boiler and three 80 gal.…Continue

BDT with vermiculite in hollow CMU walls?

Started this discussion. Last reply by Jan Green May 11. 20 Replies

We don't have many brick homes around here in central Vermont. I recently visited a one-story ranch home that was built with exterior walls of hollow core CMUs (concrete masonry units), a brick…Continue

 

Brad Cook's Page

Latest Activity

Brad Cook replied to Kevin Emerson's discussion Studies re: radon mitigation and energy efficiency
"I believe that there is a plethora of studies to support the dangers of Radon. I was a radiation specialist in the Nuclear Naval Submarine Service and I have a degree in physics. I understand the source and mechanism of Radon. It is a long term…"
Nov 9
Brad Cook replied to Meni's discussion How About an Energy Efficient Garage?
"The major problem with trying to use a garage for multiple uses, especially in our northern climates, is controlling that indoor environment. The garage will need heating if used for doing work in there in the colder periods of the year. Heating…"
Nov 9
Brad Cook replied to David Butler's discussion How would you insulate this roof?
"I do not see the need to be concerned with trying to fill the spaces between ridges of the corrugated roofing, other than to keep the warm humid outside air from getting between the PIC and the original roofing and condensing when the interior is…"
Oct 24
Brad Cook replied to David Butler's discussion How would you insulate this roof?
"Yes, a piece of blue or black tape would have an emissivity value much closer to the ideal number of 1. Be sure that the area is large enough to read. If I recall, those IR thermometers read an area that gets wider as you move away from a surface,…"
Oct 24
Brad Cook replied to David Butler's discussion How would you insulate this roof?
"I believe that it would be difficult to screw a 5-6" screw through those layers into a purlin, and those screws would not only have to be the right length, but would need a washer for every screw to keep the roof watertight. The plywood would…"
Oct 24
Brad Cook replied to David Butler's discussion How would you insulate this roof?
"I missed where the suggestion for rails came in. The plywood would not need any rails. 4+ inches is a long way way to go to screw the new roof. The plywood would only need a HeadLOC screw about every 2 ft. to secure it to the purlins. Then the new…"
Oct 22
Brad Cook replied to David Butler's discussion How would you insulate this roof?
"It kind of depends on the PIC. Not all insulation is made the same. Here in VT (and all of New England I hear), Dow no longer distributes their PIC. Lumberyards here have been carrying PIC from R-Max, Atlas, IKO, etc. There is a huge difference…"
Oct 22
Brad Cook replied to David Butler's discussion How would you insulate this roof?
"Bill, you just posted a number of responses in different areas of the thread. I will try to respond to all of them here. Any foam based insulation has a lower ignition point and they all give off dense poisonous smoke. The codes in the US usually…"
Oct 22
Brad Cook replied to David Butler's discussion How would you insulate this roof?
"I agree that it would be difficult to insulate from the exterior. It does look like at least a sheet of Polyiso (PIC) could fit between the purlins and over the beams. Additional layers would likely cover the purlins. I cannot tell from the photo…"
Oct 22
Crista replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
Oct 19
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"Hi Mike, it's good to get some feedback from the field, and thanks for confirming Gen 3 is now shipping. Sanden's website still says "coming soon" Re: heat tape... it would be ashame to use heat tape (with COP of 1) to prevent…"
Oct 19
Michael Duclos replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"I’ve been looking into Sanden for a multi-family PH near Laconia, NH, ASHRAE 99.6% temp is -3F, about 6800 HDD65F recently.  Single bedroom units, typical occupancy is 1 person, we are planning to use one 80 gal Sanden per four units to…"
Oct 18
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"theoretically, let's say you perfectly isolate the HPWH from a heat source. The HPWH's will eventually cool the air to the point that mold will grow. Here's the math: 30x30x8 = 7200 ft3 x 0.075 lbs/ft3 = 540 lbs of air 540 lbs x 0.24…"
Oct 16
Ed Whitaker replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"Brad,   I agree with the comments and would add a couple of thoughts. 1st,  any time you use a HPWH in a cold climate, you are using heat generated by your heating appliance. To avoid that you would need to insulate between the conditioned…"
Oct 16
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"Regarding Sanden... US distribution is fairly new so I imagine they make it easy to set up an account, or would sell direct. The plumber would have to be on board, though. The current model is good to -15F, and the forthcoming Gen3 is good to -20F…"
Oct 14
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"Yes, now that I've taken time to make sure I understand the physics, I'm in full agreement. Consider that with an air-air heat pump or A/C, the heat rejected by the condenser is roughly the same as the heat absorbed by the evaporator. A…"
Oct 14

Profile Information

Company
Building Performance Services LLC
Role in Home Performance Marketplace
Contractor: insulation, Energy auditor / assessor / analyst
Professional Certification
BPI, Home Energy Score Qualified Assessor
Twitter ID
@fixitron
Facebook Page
https://www.facebook.com/Building-Performance-Services-137548512935...
LinkedIn Profile
https://www.linkedin.com/in/brad-cook-66aa0018?trk

Comment Wall (1 comment)

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At 2:59pm on October 12, 2016, Diane Chojnowski said…

Hi Brad,

Welcome to Home Energy Pros. Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!

Don't forget to upload your profile photo.

Thanks!
Diane, HEP Moderator

 
 
 

Forum Discussions

Speed Tips For Duct Airtightness Testing?

Started by Brendan Reid in General Forum. Last reply by David Butler 1 hour ago. 1 Reply

What made this chimney fall down?

Started by Eric Kjelshus in General Forum. Last reply by Eric Kjelshus on Tuesday. 7 Replies

How would you insulate this roof?

Started by David Butler in General Forum. Last reply by Dave Taylor Nov 11. 61 Replies

Manual J (SD) for custom, luxury homes

Started by Dav Camras in HVAC. Last reply by Dav Camras Nov 10. 3 Replies

Quantitative methods for residential zoning

Started by Brett in HVAC. Last reply by David Butler Nov 9. 1 Reply

Latest Activity

David Butler joined Chris Laumer-Giddens's group
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Energy Efficient Design

Energy efficiency starts at the drafting table...How architects and designers can help buildings…See More
14 minutes ago
David Butler joined James White's group
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Building Simulations

Work collaboratively to find easier, more accurate and better ways to model, predict and verify a…See More
16 minutes ago
David Butler joined Mark Richardson's group
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Renewable Energy

This group will focus on the issues associated with incorporating renewable energy sources like…See More
17 minutes ago
David Butler joined Kyle Brown's group
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Wrightsoft - Manual J / Manual D

If you use Wrightsoft to calculate loads or design ducts, you likely have questions.  Get answers…See More
19 minutes ago
Profile IconDavid Butler and Don Fugler joined Allison A. Bailes III's group
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HVAC

HVAC design, Manuals J, S, T, & D, Duct leakage, Air flow, ENERGY STAR new home requirements,…See More
23 minutes ago
David Butler replied to Brendan Reid's discussion Speed Tips For Duct Airtightness Testing?
"The Home Performance Forum archives include a number of discussions on various methods for sealing…"
1 hour ago
Brendan Reid posted a discussion

Speed Tips For Duct Airtightness Testing?

Anyone like to share their favorite ways to speed up duct airtightness ("Ductblaster") tests?I'm…See More
2 hours ago
Don Fugler added a discussion to the group HVAC
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joining ducts

A question came up on exhaust duct connections. I have always considered screws necessary for…See More
3 hours ago

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