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: 274

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

Latest Activity

Don Fugler replied to Don Fugler's discussion joining ducts in the group HVAC
"Brendan, Thanks for that response. Because of your warning, I just went down to the basement and…"
42 minutes ago
Brendan Reid replied to Don Fugler's discussion joining ducts in the group HVAC
"Hi Don, Summary: DRYER VENT: screws bad idea, possibly prohibited by code. METAL DUCT: must be…"
1 hour ago
Profile IconBrendan Reid and David Butler joined Allison A. Bailes III's group
Thumbnail

HVAC

HVAC design, Manuals J, S, T, & D, Duct leakage, Air flow, ENERGY STAR new home requirements,…See More
1 hour ago
Profile IconSean Wiens and David Butler joined Chris Laumer-Giddens's group
Thumbnail

Energy Efficient Design

Energy efficiency starts at the drafting table...How architects and designers can help buildings…See More
9 hours ago
Profile IconSean Wiens and David Butler joined Mark Richardson's group
Thumbnail

Renewable Energy

This group will focus on the issues associated with incorporating renewable energy sources like…See More
9 hours ago
Al Tibbs posted photos
10 hours ago
Al Tibbs replied to Bob Krell's discussion What Do You Do When You Find Suspected Mold? in the group Healthy Indoors (IAQ)
"In any case where there is visible mold present, I would begin with a thorough VISUAL assessment of…"
10 hours ago
Al Tibbs joined Bob Krell's group
Thumbnail

Healthy Indoors (IAQ)

The Healthy Indoors group is focused on indoor air quality (IAQ), mold, moisture control, radon,…See More
10 hours ago

Photos

  • Add Photos
  • View All

© 2017   Created by Home Performance Coalition (HPC)   Powered by

Badges  |  Report an Issue  |  Terms of Service