Greetings everyone! 

   I was hoping I could get some feedback with a building I am working on. The existing concrete was a 3 inch "homeowner special", so the plan is to set 2 inches of rigid foam, tubing for radiant heat, and four inches of new pour concrete.

1.) Do I need anything between the insulation and the existing concrete?

2.) The radiant pipes have ties to attach to the iron rods for the concrete, so I can only imagine that the metal goes first, then the radiant...

3.) How do I protect the rigid foam from damage from walking on it to do the other steps?

4.) Does the rigid foam boards needs to be taped between each other and to the end of the block?

This is a very exciting project and your feedback is greatly appreciated, 

    Luis

Tags: board, concrete, floor, foam, heat, installation, insulation, radiant

Views: 192

Reply to This

Replies to This Discussion

What is the issues with the "homeowner special" concrete - wavy, falling apart, or... That can easily change some answers depending on the severity 

#1 - generally not needed, though sometimes you might need a floor leveler, maybe even a crack/moisture isolation membrane

#2 - Personally I like having the radiant around the halfway mark in the slab with the metal though many simply attach it directly to the foam like is shown here http://blog.sls-construction.com/2012/common-sense-building-radiant...

#3 - use the proper foam & it can handle it - should be a high density closed cell foam

#4 - that is a very good idea

One last tip - make sure you have the pex lines pressurized while you are doing this and check them as you go - last thing you want to do is find out you have a leak after the concrete is set, while messy it is easier to fix now then later

Not sure if this would have any bearing on your project at all. Thought I would mention it though.
When we apply our coating on new concrete walls or new stucco, we always have to test the Ph level first. It must be no higher than 4, we prefer 3 or below. With concrete or stuccvo that is 5-yearsold or older, rarely an issue. Less than 5, many times an issue. It causes major bonding problems.
Again, not sure if a high Ph level concrete would cause issues with your foam or not. Possibly???
Some paint companies make a primer for high Ph surfaces. Might be a good thing to look into. Will a high Ph level concrete eat the foam??? I dont know, thats why I'm bringing it up.

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network.

Latest Activity

Mariusz Chorazy posted a blog post

Here are a few tips to keep your air conditioning bill low

TAKE GOOD CARE OF YOUR AIR CONDITIONER – Like any major appliance, your AC requires regular…See More
yesterday
Dale Pickard replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Morgan, I got this below from the Knight installation manual. I note a few things, -These…"
yesterday
Dale Pickard replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Hans, The car manufacturer's are doing it with mass flow sensors and oxygen sensors…"
yesterday
Dale Pickard replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"I was trying to avoid naming manufacturers, but I was going by the published information for the…"
yesterday
Eric Kjelshus replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"I look at this not about AFUE,  but flue gas dewpoint.  If your burn rate is rotting the…"
yesterday
Bob Blanchette replied to Kirsten Richnavsky's discussion Crawl spaces and attics: OSHA to implement new rule on confined spaces
"Keeping HVAC equipment out of attics should be part of the new code. "
yesterday
Linda Wigington replied to Linda Wigington's discussion Weigh in - Honorable Mention? 2nd Base? Half-Way There? 50% Better? On the Path? in the group 1000 Home Challenge
"Nickie -  Good points. I think it is easy enough to flag or designate projects that achieve…"
yesterday
Morgan M Audetat replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Though Viessmann is relatively unique in the application of Lambda technology to condensing…"
Friday

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service