Does concrete block have an R-value?
Concrete block makes a cost-effective and structurally sound wall, but it has little thermal resistance. Depending on the density of the blocks, an 8-inch thick block wall without any other type of insulation has a thermal resistance value between R-1.9 and R-2.5.
What is the R-value of filled concrete block?
Tables of Building Material R-values
| Material | Thickness | R-value (F° · sq.ft. · hr/Btu) |
|---|---|---|
| Concrete Masonry Unit (CMU) | 4″ | 0.80 |
| Concrete Masonry Unit (CMU) | 8″ | 1.11 |
| Concrete Masonry Unit (CMU) | 12″ | 1.28 |
| Concrete 60 pounds per cubic foot | 1″ | 0.52 |
Is perlite a good insulator?
Perlite ore, when expanded, takes on a low- density cellular structure that makes it an extremely efficient high-temperature insulation material.
What is the thermal conductivity of perlite?
0.0153 to 0.0193 W/mK
The new test data shows that perlite conditioned in standard conditions has a thermal conductivity of 0.0153 to 0.0193 W/mK at 113 K. Varying the relative humidity (R.H) of the environmental chamber used to prepare some samples from 40% to 80%, made little to no change to the thermal conductivity values.
What is the R-value of 1 inch of hard foam insulation?
This insulation board is probably one of the most widely used foam board insulation products in the residential construction industry. XPS has an R value of 4.5 to 5.0 per inch of thickness. This is the product that I typically use to insulate basement walls. It’s reasonably priced, light weight and easy to use.
What is the R-value of perlite?
2.7
With an R-value of 2.7, perlite under-performs other insulators, such as fiberglass, rockwool and cellulose. It outperforms others, however, such as vermiculite, loose-fill wood products, and straw.
Does perlite insulation absorb water?
The surface of perlite is made up of the outer convex shells of glass bubbles and concave openings, so each particle can soak up a good amount of water.
How heat resistant is perlite?
Perlite particles are extremely lightweight, frothy mineral bubble clusters that are readily compatible with cementitious and other SFRM formulations. Having been flash-expanded from its graded, raw ore form at high temperature, perlite can withstand temperatures from 1600 to 2000ºF before reaching its softening point.
Does perlite retain heat?
While it is true that perlite concrete will insulate more than regular concrete, in practice you will find that perlite concrete will retain heat and offer more thermal mass than it will practical insulation.
What is the R-value of 4 inch rigid insulation?
This product typically has an R value of 3.6 to 4.0 per inch of thickness.
Which side of foam board insulation faces out?
If you’re wondering whether to put the foil side of foam insulation board shiny side in or out, consider whether you want to make the space inside warmer or cooler. If you want to make the space warmer, the foil should face inside so it can reflect radiant heat back into the room.
What should the are value be for insulating concrete?
The R-value of the insulating concrete depends on its unit weight and thickness. The bag in which the perlite or vermiculite is purchased recommends the mix proportions needed to achieve various unit weights of fresh concrete and oven-dry concrete.
Which is better perlite or polystyrene loose fill insulation?
Thermal performance tests using ASTM C-236 Guarded Hot Box Method have shown conclusively that perlite masonry loose fill insulation is the superior concrete block insulation when compared to expanded polystyrene (EPS) inserts, expanded polystyrene (EPS) beads, and vermiculite.
What are the standards for perlite masonry insulation?
Standards, Specifications and References: Perlite is represented in the standards by ASTM product specification C549. The ASTM test methods used to evaluate loose-fill Perlite insulation are listed below.
What is the STC for perlite cavity fill insulation?
Lightweight 8 inch (20 cm) masonry block filled with perlite achieves an STC of approximately 51 which exceeds HUD sound transmission standards. Perlite loose fill insulation functions as a permanent, non-toxic, non-combustible, rot-proof insulation which minimizes winter heat loss and summer heat gain.