[Greenbuilding] Insulation Under Snow Melt Slab for sidewalk and driveway

Michael Zyla mzyla at verizon.net
Thu Sep 22 14:27:19 CDT 2011


Cement sidewalk, 3 feet wide, 18 feet long, probably two cement joints.  Can
someone recommend the insulation type, brand, etc.  to place under the slab?
My cars will drive over this sidewalk to gain access to two-car driveway
about 25 feet long  X 18 feet wide.  The driveway will also have snow melt.
Concerned insulation will not support slab and crack when loaded by cars.

Can buy, at big box store, 2" thick Owens Corning Foamular Extruded
Polystyrene (XPS) Foam Insulation  F-150 2 in. x 48 in. x 96 thermal
performance at r-5 per in.  Sold for exterior wall sheathing, wall furring,
perimeter/foundation, cavity wall, crawlspace, pre-cast concrete, UNDER SLAB
and other applications.  Will use insulation vertically on sides of slabs,
but should these be covered with cement, maybe 2" on top of vertical
insulation?  Any "watch outs" about conditioning bed for slab?

Slab thickness?  Rebar grid size, style? Other comments?  Also, any
experience with tubing?  Copper, PEX?  Any special PEX?  I'm aiming for
hydronic rather than electric.  Tubes crossing joints?  Insulate tubes
traveling through joints?  

THANKS VERY MUCH - you're all great!

See  <http://www.concretenetwork.com/concrete/snow_melting_systems/>
http://www.concretenetwork.com/concrete/snow_melting_systems/ .  

Nice design manual here 

 
<http://www.doyouuponor.com/~/media/Extranet/Files/manuals/SIMeltMan2003.asp
x?sc_lang=en>
http://www.doyouuponor.com/~/media/Extranet/Files/manuals/SIMeltMan2003.aspx
?sc_lang=en

Cheers, Mike

 

 

 

 

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