Perlite underslab
Last Post 26 Jan 2018 04:56 PM by PerliteSweden. 27 Replies.
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LieblerUser is Offline
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01 Oct 2012 11:40 AM
I didn't find the water retention  data ICF mentioned but I did find this:

"Perlite loose-fill insulation is an inert volcanic glass expanded by heating to 1600° F (850° C) and
treated with a non-flammable silicone to ensure against water retention. The resulting granular product
is lightweight with countless tiny, sealed air cells which account for its excellent thermal performance.
The characteristics of perlite loose-fill insulation provide many additional benefits including:
- Perlite loose-fill insulation is free-flowing and will uniformly and completely fill all cores and voids
in masonry wall units.
- Perlite loose-fill insulation is inorganic and is rot, vermin and termite resistant.
- Perlite loose-fill insulation is non-combustible with a fusion point of approximately 2300° F
(1260° C), while EPS products are combustible.
- Perlite loose-fill insulation improves the fire rating of an 8 inch concrete block from 2 hours to 4
hours- a 100% improvement!
- Perlite loose-fill insulation is non-settling and supports its own weight in masonry wall cavities
and masonry block cores.
- Perlite loose-fill insulation may be easily installed without special training or equipment."

 So there may be good reason to being specific in ordering perlite, making sure to get the loose fill insulation grade or type.
I wish I could find the reference as it is my understanding that perlite does not aBsorb any water instead it aDsorbs water in soils by creating soil pores. FWI aDsorb is to hold water on the outside of a particle while aBsorb is to hold water internally.


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01 Oct 2012 07:54 PM
Posted By Liebler on 01 Oct 2012 11:40 AM
I didn't find the water retention  data ICF mentioned but I did find this:

"Perlite loose-fill insulation is an inert volcanic glass expanded by heating to 1600° F (850° C) and
treated with a non-flammable silicone to ensure against water retention. The resulting granular product
is lightweight with countless tiny, sealed air cells which account for its excellent thermal performance.
The characteristics of perlite loose-fill insulation provide many additional benefits including:
- Perlite loose-fill insulation is free-flowing and will uniformly and completely fill all cores and voids
in masonry wall units.
- Perlite loose-fill insulation is inorganic and is rot, vermin and termite resistant.
- Perlite loose-fill insulation is non-combustible with a fusion point of approximately 2300° F
(1260° C), while EPS products are combustible.
- Perlite loose-fill insulation improves the fire rating of an 8 inch concrete block from 2 hours to 4
hours- a 100% improvement!
- Perlite loose-fill insulation is non-settling and supports its own weight in masonry wall cavities
and masonry block cores.
- Perlite loose-fill insulation may be easily installed without special training or equipment."

 So there may be good reason to being specific in ordering perlite, making sure to get the loose fill insulation grade or type.
I wish I could find the reference as it is my understanding that perlite does not aBsorb any water instead it aDsorbs water in soils by creating soil pores. FWI aDsorb is to hold water on the outside of a particle while aBsorb is to hold water internally.


It seems logical that it would  adsorb. The information says is is comprised of tiny sealed air cells which give it the  insulation value. However the surface of each partical would probably have many broken cells which would hold water available to surrounding soils.  This is of course just my theory.


LieblerUser is Offline
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04 Oct 2012 04:56 PM
Whirnot,
Here is the page of the perlite institute on underfloor loose perlite that shows r values from 3 to 3.7/in. for underfloor use.
http://www.perlite.org/product_guides/21%20perlite%20for%20underfloor.pdf
whirnotUser is Offline
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04 Oct 2012 05:34 PM
Posted By Liebler on 04 Oct 2012 04:56 PM
Whirnot,
Here is the page of the perlite institute on underfloor loose perlite that shows r values from 3 to 3.7/in. for underfloor use.
http://www.perlite.org/product_guides/21%20perlite%20for%20underfloor.pdf


Thanks, I had seen that but could not figure the conversion....
LieblerUser is Offline
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04 Oct 2012 05:38 PM
Thermal conductivity is U & U = 1/r or r= 1/u therefore if u= .33 , r =3 if u=.27, r=3.7
perliteUser is Offline
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30 Jun 2015 06:56 AM
Do you know the perlit? , I know

http://www.genper.com.tr/tr-TR/urunler/34/perlit-nedir?/1

PerliteSwedenUser is Offline
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26 Jan 2018 04:32 PM
Hello everyone! I actually work with Perlite to insulate "slab on grade"?. Its a bit over my english skills tying to explain it in the right words, but bara with me! I insulate underneath concrete slab. Perlite has an u-value from 0.39-0,42 depending of material size. Perlite for insulation must me hydrophobic (02% silicate added) that means that it does not absorb water or moisture. Perlite transport water straight up 6 cm, not more. Perlite can carry loads up to 5000kg/m2, concrete slab no problems Perlite is an Diffusion open material. Good in brick cavity walls.
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26 Jan 2018 04:56 PM
As a contracter in Sweden we insulate concrete slab like this with same result as eps or xps because it is seamless: 1. Geotextile on the ground 2.Fill with Perlite on a day with not extreme windy conditions!(Open plastic bags, no bags in this method to avoid gaps) 3 Cover again with geo textile or perhaps plastic 4 welded mesh reinforcement 5 attatch floor heating hose to mesh 6 Use lightweight gravel vibrator to make a hardened surface, the Perlite compresses approx 4-5 cm 7 welded mesh reinforcement on top of hose. 8 Time for concrete! A big plus is thet no rodents or termites can destroy Perlite. Please comment so i can correct any misunderstandings. We buy our material from www.perlite.dk #perliteunderslab
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