comparing R values

harvey

thats just what i wanted to know

harvey

R values

How would you calculate the total R values for these two floors. They would be installed over Sub-Ray panels:
#1 1/4" luan plywood, R-.35 rubber pad 1/4", 11/16 carpet very dense 100% nylon.

#2 1/4" luan plywood, R-.46 rubber pad 3/32" , 9/16 plywood engineered floating floor with white oak as top ply of plywood floor. Rubber pad for sound control. Might use 3/8" luan with 6 mil poly under floating floor. Your thoughts?

Gary Fereday

Just add up the R values

> How would you calculate the total R values for

> these two floors. They would be installed over

> Sub-Ray panels: #1 1/4" luan plywood, R-.35

> rubber pad 1/4", 11/16 carpet very dense 100%

> nylon. #2 1/4" luan plywood, R-.46

> rubber pad 3/32" , 9/16 plywood engineered

> floating floor with white oak as top ply of

> plywood floor. Rubber pad for sound control.

> Might use 3/8" luan with 6 mil poly under

> floating floor. Your thoughts?

Gary Fereday

Just add up the R values

Of the various compponents. remember that R value is the "resistance" to heat transfer. I think your asking how much heat will those floors conduct to the room. 1/R="conduction of heat transfer" all this is set to at least this standard, "per dergree per sq. foot." ( note here) that if you raise the temp of the water in the panels above that which is comfortable to walk on, sooner or later it will be uncomfortable to walk on it. If the conduction of the floors is extreamly low, BB or other supplememt heating devices should be used.

harvey

thanks for the reply

what i am asking is what are the R values for the components I had listed. the pads I have listed. The others I need to know. Thanks

Tom Meyer

Close R-values

From the information you gave, you can use these numbers. They are as close as I can get.

1/4" plywood = .31
11/16 carpet very dense 100% nylon = ~2.64
9/16 plywood engineered floating floor = ~.57
3/8" plywood = .47

These are only working numbers and you need to verify them from the manufacturer, particularly the engineered floating floor.

Senior Designer/Trainer
Precision Hydronics Corporation
www.precisionhydronics.com

Dave Yates (PAH)

Watts design program

allows you to edit the floor composition to add or delete multiple layers on a room by room or zone basis. You can download a trial version on their web site.

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Jed_2

Dave, It's not the only one that does that, now is it!???(NM)