In-floor heating, PEX creaking noises


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Old 12-13-09, 07:33 PM
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In-floor heating, PEX creaking noises

I have a hydronic in-floor heating system that is done within the concrete slab (no problem) and also done under the sub-floor joists (this is where the problem is).

The areas that are done under the floor joists with pex and a reflective insulation are a problem in that they tend to creak. The creaking occurs for about 10 mins when the zone starts up. I realize this occurs from a temperature change, but it's really annoying and quite loud in the middle of the night.

What I wondering is, has anyone attempted to fed these zones with a variable speed pump so that the zone never actually gets cool and therefore doesn't have to go through the temperature delta that causes the creaking to occur?

Any ideas would be appreciated.

Thanks.
 
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Old 12-14-09, 12:57 AM
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Interesting thought, but not my field. However, two of the jobs I have worked ended up adding Teflon tape between the pex and the metal reflective plates. If you have access, this may help.

Bud
 
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Old 12-14-09, 06:39 AM
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Originally Posted by Bud9051 View Post
Interesting thought, but not my field. However, two of the jobs I have worked ended up adding Teflon tape between the pex and the metal reflective plates. If you have access, this may help.

Bud
That would be worth trying but unfortunately I don't have access as it's a finished ceiling and all drywalled. I'll explore maybe using a recirc pump or something on this zone to keep warm water moving.
 
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Old 12-14-09, 06:56 AM
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Here is a link you have probably already visited.
http://www.floproteam.com/uploads/Fi...peedoocirc.pdf

Bud
 
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Old 12-14-09, 08:45 AM
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I dont have any strap-up (only in-slab), but just a thought..

Did the original installation provide a mixing valve in the system ?

Usually you dont feed full boiler temperature water into a slab/etc (can warp wood floors etc). If you turn the mixer output down some, the circ will run longer to satisfy the tstats and you wont have as large a delta cycle.
 
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Old 12-15-09, 02:52 PM
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I stapled up a few jobs with PEX, I don't do that anymore.

The last was for a friend, who I told it would creak, but wanted to do it anyways.

The best approach to quieting it somewhat has been outdoor reset control.

Get the water temp as close as possible to design, and play with the flow to get it to run as long as possible.
You may need a buffer tank to buffer the load if it's small and not on a CI boiler.

You can get them pretty quiet, it takes work.
 
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Old 12-16-09, 07:05 PM
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I'm running my system of a Weil McClain boiler... problem is, no one in my area understands what I'm trying to do or knows how to do it very well with controls. I do have mixing valves but I don't know much about the outdoor reset control. Weil McClain can't even recommend someone in my area that can support their product... TO Heating, you heading east any time soon?
 
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Old 12-16-09, 08:00 PM
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Funny that,

I head east EVERY weekend.

North of Napanne.

Where are you ?
 
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Old 12-16-09, 08:03 PM
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I'm just West of Belleville. I live on the Bay between Trenton and Belleville. So you must be going up in the Tweed area?
 
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Old 12-16-09, 08:14 PM
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I think Tekmar has the outdoor reset you're refering to. As well, they have a controller that could better regulate my system....
 
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Old 12-17-09, 11:48 AM
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Originally Posted by decacable View Post
I'm just West of Belleville. I live on the Bay between Trenton and Belleville. So you must be going up in the Tweed area?
Yeah I go past tweed, up near Kaladar.
 
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Old 12-17-09, 11:53 AM
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Originally Posted by decacable View Post
I think Tekmar has the outdoor reset you're refering to. As well, they have a controller that could better regulate my system....
I install a lot of Tekmar, they make some good products.

There are simple boiler controls to all out house controls>

I am running a Tekmar Technet 4 system online currently right now.
 
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Old 12-17-09, 06:30 PM
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That sounds perfect. I have a lot of smart home applications running and I'd love to be able to tie the boiler controls into this. The Tekmar controler would make perfect sense. If you ever have time, or want to take a long weekend, I'd love to show you what I've got going and what I'm trying to do.
 
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Old 12-17-09, 06:42 PM
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Any time.

With Christmas close maybe in the new year.
PM me when you have time.
 
 

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