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: 187

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.

Latest Activity

Jerry Lawrence posted events
11 hours ago
Morgan M Audetat replied to Bryan Pringle's discussion Dense packed cellulose in basement?
"Right you are. You have to ask: what will the cellulose contribute.  Here in Minneapolis we…"
12 hours ago
Morgan M Audetat replied to Tony Hicks's discussion Slab-on-grade Insulation
"All slabs float. We have been installing radiant floors on various slab constructions since the…"
13 hours ago
Tony Hicks replied to Tony Hicks's discussion Slab-on-grade Insulation
"2" XPS foam. I'd love an R-20. Having foam thick enough to get an R-20 would be…"
13 hours ago
Morgan M Audetat replied to Larry Schaffert's discussion How to correctly insulate exterior wall in a 1900 house?
"Sorry, I did missed the "siding nailed directly to the framing", my grandfather would…"
14 hours ago
Morgan M Audetat replied to Larry Schaffert's discussion How to correctly insulate exterior wall in a 1900 house?
"My own farm house is sided with 1/2" t&g pine boards and vinyl. We foamed then from the…"
14 hours ago
Tony Hicks replied to Tony Hicks's discussion Slab-on-grade Insulation
"Great thought! I think that would work. I'll have to put the cost together and see where I…"
14 hours ago
Danny Gough replied to Tony Hicks's discussion Slab-on-grade Insulation
"This is a tough detail because the foam on the edge of a slab doesn't provide sufficient…"
yesterday

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service