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  2. Spray foam - Wikipedia

    en.wikipedia.org/wiki/Spray_foam

    Open cell spray polyurethane foam insulation being applied in wall cavities. Open cell insulation can be crushed in your hand and has a lower insulation value. Closed cell is rigid to the touch and each air cell is completely sealed. While closed cell foam has a higher R-value, it is more costly to buy. [9] Medium-density closed-cell spray foam ...

  3. Building insulation material - Wikipedia

    en.wikipedia.org/wiki/Building_insulation_material

    Open-cell foam is porous, allowing water vapor and liquid water to penetrate the insulation. Closed-cell foam is non-porous, and not moisture-penetrable, thereby effectively forming a semi-permeable vapor barrier. (N.B., vapor barriers are usually required by the Building Codes, regardless of the type of insulation used.

  4. Closed-cell PVC foamboard - Wikipedia

    en.wikipedia.org/wiki/Closed-cell_PVC_foamboard

    Closed-cell PVC foam takes solid shape due to its linear structure. However, due to this structure, it is more brittle than open-celled PVC foam. It is available in densities varying from 3 to 25 pounds per cubic foot (0.048 to 0.400 g/cm 3). [3] It has a low flammability rate. [4]

  5. Metal foam - Wikipedia

    en.wikipedia.org/wiki/Metal_foam

    Open-cell metal foam CFD (numerical) simulation of fluid flow and heat transfer on an open cell metal foam. Open-celled metal foam, also called metal sponge, [3] can be used in heat exchangers (compact electronics cooling, cryogen tanks, PCM heat exchangers), energy absorption, flow diffusion, CO 2 scrubbers, flame arrestors, and lightweight optics. [4]

  6. Cellulose insulation - Wikipedia

    en.wikipedia.org/wiki/Cellulose_insulation

    The word cellulose comes from the French word cellule for a living cell and glucose which is a sugar. The main house of American president Thomas Jefferson's plantation Monticello was insulated with a form of cellulose in 1772. [1] Cellulose was used more widely as an insulation material in Scandinavia from the 1920s. [2]

  7. Polystyrene - Wikipedia

    en.wikipedia.org/wiki/Polystyrene

    Although it is a closed-cell foam, both expanded and extruded polystyrene are not entirely waterproof or vapor proof. [58] In expanded polystyrene there are interstitial gaps between the expanded closed-cell pellets that form an open network of channels between the bonded pellets, and this network of gaps can become filled with liquid water.

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