| Author |
Message |
Robin E. Snyder
Senior Member
Username: robin
Post Number: 710
Registered: 08-2004
| | Posted on Monday, December 04, 2017 - 12:20 am: |    |
Apparently Perimate isn't available until early 2018 - what do you all specify for insulating below grade vertical walls? Is 25psi compressive strength generally acceptable for below grade insulation (v perimate's 30 psi)? |
Jeffrey Wilson CSI CCS SCIP
Senior Member
Username: wilsonconsulting
Post Number: 244
Registered: 03-2006
| | Posted on Monday, December 04, 2017 - 11:42 am: | |
In the Mid-Atlantic region, Type IV Extruded Polystyrene Board (25-psi compressive strength) is most common. That's what Perimate is, but many manufacturers offer this.
Jeffrey Wilson CCS CSI SCIP
Wilson Consulting Inc
Ardmore PA |
Sheldon Wolfe
Senior Member
Username: sheldon_wolfe
Post Number: 999
Registered: 01-2003
| | Posted on Monday, December 04, 2017 - 07:01 pm: | |
Perimate has grooves to improve drainage. I don't see much value there if you're using drainage fill or drainage composite.
I'm not convinced a higher compressive strength is required below grade, especially for vertical applications. A compressive strength of 25 psi is the same as 3,600 psf; ask your engineer what the lateral pressure is at the footing. |
Paul Sweet (Unregistered Guest)
Unregistered guest
| | Posted on Tuesday, December 05, 2017 - 12:30 pm: | |
Polystyrene beadboard used to be used. I remember one project on a farm where they had a flock of peacocks who loved the stuff! I think that termites & other critters might also like it. |
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