Home>Discussions>INSULATION & HVAC>How to insulate above radiant water heating in ceiling?
21 posts / 0 new
Last post
johnjh2o
Re: How to insulate above radiant water heating in ceiling?

I'm not a insulation contractor but I don't see condensation as being a problem. Just don't pack it down and if you have soffit vents be sure not to block them.

John

dcalabro
Re: How to insulate above radiant water heating in ceiling?

*** hydronic in an attic? that amazes me and I wish I were in your position so i could sell all of that copper and get a more efficient layout. Heat rises so I would think baseboard hydronic would work much better for you to head the rooms rather than heating the attic.

johnjh2o
Re: How to insulate above radiant water heating in ceiling?
dcalabro wrote:

*** hydronic in an attic? that amazes me and I wish I were in your position so i could sell all of that copper and get a more efficient layout. Heat rises so I would think baseboard hydronic would work much better for you to head the rooms rather than heating the attic.

To do that he would have to run the boiler at a higher temperature. And seeing as he has radiant heat on the first he would need a panel troll to lower the temperature for the first floor zone. All he is asking to do is insulate to lower his heating bills I don't think redoing the entire system is what he is looking for.

John

GregoryK
Re: How to insulate above radiant water heating in ceiling?

So it's a 2 story daylight ranch...we have radiant in the slab below, but upstairs is where the living areas are and they're in the ceiling. I almost never turn on the heat down below....never gets that cold.

johnjh2o
Re: How to insulate above radiant water heating in ceiling?
GregoryK wrote:

So it's a 2 story daylight ranch...we have radiant in the slab below, but upstairs is where the living areas are and they're in the ceiling. I almost never turn on the heat down below....never gets that cold.

Are you saying you would rather remove and scrap your existing heating? No matter what you do you should insulate the attic space. Why not do that now and see how it works out. I think you will be very happy with it.

John

johnjh2o
Re: How to insulate above radiant water heating in ceiling?
GregoryK wrote:

So it's a 2 story daylight ranch...we have radiant in the slab below, but upstairs is where the living areas are and they're in the ceiling. I almost never turn on the heat down below....never gets that cold.

No matter what you decide to do you should insulate your attic space. You may find it will give you what your looking for.

John

lekun
Re: How to insulate above radiant water heating in ceiling?
GregoryK wrote:

I have a 1950 daylight ranch and the radiant water heating on the ground level is in the slab, but upstairs (Where the main living area is) has radiant water copper pipes in the ceiling and there's no insulation above it. Our heating bills are ridiculous in the winter and I'd like to know how to insulate above the pipes? Do I need a radiant barrier for above the pipes or can I just lay the roll fiberglass insulation over the top of them? I've also heard that I need 3/4" air space and another person told me 6".

This is a rare bird that has this kind of heat in the ceiling so does anyone have any experience with this?

Thanks.

GregoryK - did you ever get a solution to this? I have the exact same situation - in Oregon no less - and have the same concerns and questions you did/do.

Tisa2U
Re: How to insulate above radiant water heating in ceiling?
lekun wrote:

GregoryK - did you ever get a solution to this? I have the exact same situation - in Oregon no less - and have the same concerns and questions you did/do.

I need to know, too.

Re: How to insulate above radiant water heating in ceiling?

We consult on old radiant systems, design and install new ones as well.

The answer is insulate with reckless abandon. Radiant heat does not need a "radiant" barrier. In fact if it touches is conducting heat and only radiates through unobstructed air.

So insulate to the recommended depth for your area plus 20% and be happy.

The other factor that will effect the cost of operation is the water temperature sent to the ceiling. The standard is 110F max and outdoor reset will improve comfort and efficiency.

torbanac
Re: How to insulate above radiant water heating in ceiling?

I have a 1950 's house with copper pipe radiant heating in the ceiling. It is a plaster ceiling with metal lathe and the pipe is 3/8 copper on 6" center in the plaster. The plans called for 6 in. of rock wool on top of the lath. the previous owner added more so now there is about 1 feet of it in the joists. Just bought the house 2 months ago so I am still learning myself

Pages

TV Listings

Find TV listings for This Old House and Ask This Old House in your area.