Insulating the supply and return

ScottMP

We put amourflex insulation on the tubing. We did this in the slab of a boiler room so not to over heat the room from all the supply and returns. Is this what you are talking about ?

Scott

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Dr Pepper

Insulated supply and return..?

This project has a run from mechanical room to snow melt area of 80 feet under the floor slab. In the past I've buried the tube in sand or put extruded poly above and below to help insulate. But, does someone make a small size (<2") under slab insulated PEX or do you have insulation that has worked for buried supply and return?

Thanks,
Art

Dr Pepper

Scott,

Armaflex is not rated for ground contact as far as I have found out. If it holds up in the concrete pour you show it will provide a larger space and some insulation value. I work for an A&E as a designer and the job has to meet or exceed code. My S/R tube will run under the slab in a sand base. But I would like to find a "reasonable cost", off the shelf insulation for small dia. tube. I've sent e-mail to Wirsbo and Armaflex and will post their answers.

Thanks, Art

Matt_21

try

ecoflex.com. we have used some 3 & 4" on larger underground hot water and chilled water jobs but i believe they also have smaller sizes.

hr

I made the mistake

of trying to help out the plumber by running some insulated pex for him, on this radiant slab job.

Even though we fastened it every foot, to the mesh, it floated. In fact it floated the mesh also!

We caught it in the act, while the concrete was being poured, and quickly bent some rebar hoops to try to stake it down.

Still I ended up cutting a brand new slab to get them back down. It floated right to the top and cracked about 30 feet! I feel badly

Appararently the vibration from the power screed and ride on trowel machines kept working the insulated tube to the surface.

An expensive lesson I'll not soon forget.

Next time the insulated tube goes in the gravel well below the mesh.

Look into www.insulseal.com it is an insulated sleeve that you can install whatever you need inside. We use it for outdoor boiler installations. Wish I had used it on this large slab.

hot rod

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