[Greenbuilding] Unifoam vs Plastispan

Tue Oct 3 22:00:12 CDT 2017

Depends on perimeter depth. Are you doing a frost protected foundation? Or are the footings below freezing and fully wrapped? consideration on the perimeter and bridging. I’ve typically gone R20 on slab but R30 on perimeter.

From: Greenbuilding [mailto:greenbuilding-bounces at lists.bioenergylists.org] On Behalf Of Lynelle Hamilton
Sent: Tuesday, October 3, 2017 7:50 PM
To: greenbuilding at lists.bioenergylists.org
Subject: Re: [Greenbuilding] Unifoam vs Plastispan

Norbert, is the 50F true when the slab is shallow (e.g. essentially on packed earth that is 16" below grade?

Lynelle

On 2017-10-03 7:19 PM, Norbert Senf wrote:

Way high. If you do a payback analysis for the last R-10 it is close to infinite. Ground temperature around here is 50F, so your maximum differential is maybe 20 degrees ............... N

On Tue, Oct 3, 2017 at 7:11 PM, Gennaro Brooks-Church - Eco Brooklyn <info at ecobrooklyn.com> wrote:

R-35 under slab is high or low?

Thanks!

Gennaro

On Tue, Oct 3, 2017 at 6:59 PM, John Straube <jfstraube at gmail.com> wrote:

I am not sure what is special about your slab, but standard XPS (25 psi max) has been used for decades.  Hence, EPS with more than 25 psi seems odd anywhere except where a concentrated load occurs.  Remember, 25 psi is 3500 psf, which is more than most soils can take. But to answer part of the question I have use PlastiFab EPS of wide range of strengths successfully for a long time, and have no experience with Uniform.
Of course insulating with R-35 under slab seems very odd… the result of bizarre interior conditions or bizarre calculation methods?

> On Oct 3, 2017, at 6:24 PM, Lynelle Hamilton <lynelle at lahamilton.com> wrote:
>
> I am insulating under a floating pad. The engineer has specified 25psi under the slab and 30 psi on outer edges.   I've been looking at two products: Unifoam 25/30 and Plastifab 25/30. Aiming for R35 under the slab.  Price differential is significant (Unifoam is nearly $3000 more) for the house.
>
> Has anyone had experience with either product? From the specs, Unifoam appears to absorb less water and has less deflection, but both are within the ASTM spec for the issue.
>
> Many thanks for any insights!
>
> Lynelle Hamilton
>

>       Virus-free. www.avast.com
> _______________________________________________
> Greenbuilding mailing list
> to Send a Message to the list, use the email address
> Greenbuilding at bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org

_______________________________________________
Greenbuilding mailing list
to Send a Message to the list, use the email address
Greenbuilding at bioenergylists.org

to UNSUBSCRIBE or Change your List Settings use the web page
http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org

_______________________________________________
Greenbuilding mailing list
to Send a Message to the list, use the email address
Greenbuilding at bioenergylists.org

to UNSUBSCRIBE or Change your List Settings use the web page
http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org

-- 

Norbert Senf
Masonry Stove Builders
25 Brouse Road, RR 5
Shawville Québec J0X 2Y0
819.647.5092
www.heatkit.com

_______________________________________________
Greenbuilding mailing list
to Send a Message to the list, use the email address
Greenbuilding at bioenergylists.org

to UNSUBSCRIBE or Change your List Settings use the web page
http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org

 <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> 

Virus-free.  <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> www.avast.com 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/greenbuilding_lists.bioenergylists.org/attachments/20171003/ee9058a8/attachment.html>