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Forum: Geothermal & Heat Pumps 09-29-17, 03:12 PM
Replies: 37
Views: 19,467
Posted By TechShop
The main difference is in the manufacturing...

The main difference is in the manufacturing process used for each foam.

EPS starts with a bunch of tiny polystyrene beads. They pour them into a mold and then heat it all up with steam or hot...
Forum: Geothermal & Heat Pumps 09-29-17, 11:27 AM
Replies: 37
Views: 19,467
Posted By TechShop
XPS foam has far more dimensional stability than...

XPS foam has far more dimensional stability than EPS foam. The blue stuff at the local stores is usually 15 PSI structural XPS. I special-ordered 25 PSI for use under my concrete slab foundation...
Forum: Geothermal & Heat Pumps 09-29-17, 02:08 AM
Replies: 37
Views: 19,467
Posted By TechShop
Yeah, foam is a kick-*** value in a situation...

Yeah, foam is a kick-*** value in a situation like this, you get some structure and some decent R-value too.

They have 2" thick foil-covered stuff at the box-stores around here for around $23 a...
Forum: Geothermal & Heat Pumps 09-28-17, 08:52 PM
Replies: 37
Views: 19,467
Posted By TechShop
Filling the box with fiberglass is a great idea. ...

Filling the box with fiberglass is a great idea.

You could also use a large tarp or scrap piece of poly sheeting to wrap around the insulation to keep it tidy.

For the price of even the...
Forum: Geothermal & Heat Pumps 09-28-17, 08:29 PM
Replies: 37
Views: 19,467
Posted By TechShop
I use a 28 gallon electric unit in my shop. The...

I use a 28 gallon electric unit in my shop. The slab is heated, but I put it on 2" R-10 foam. My only hot water requirements are showers each day and a load of laundry once or twice a week.

If...
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