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Perlite’s versatility allows it to be incorporated into various roof assemblies:
1. Insulating Concrete
This is the most common use of perlite for roof insulation. Instead of using sand and gravel, expanded perlite aggregate is mixed with cement and water.
Benefit: The resulting screed has a significantly lower density and much higher R-value (thermal resistance) compared to standard concrete. It provides a strong, load-bearing substrate that can accept waterproofing membranes (like those offered by PROTEC).
Tapered Systems: Perlite insulating concrete can be tapered (poured with varying thickness) to
direct rainwater to drains. This is crucial for preventing ponding water,
In some cases, particularly between decking and a concrete topping, loosefill perlite may be used.
Benefit: It fills irregular spaces completely and provides uniform, seamless insulation with no thermal bridging.
Perlite is mixed with binders and formed into rigid, prefabricated
boards.
Benefit: These boards offer very good compressive strength and are used
under waterproofing membranes or as base layers in built-up roofing systems.
| Feature | Benefits of Root Systems | Brand Alignment (PROTEC) |
|---|---|---|
|
Fire Resistance |
Non-combustible (Class A1/Class 1 rating). Withstands
temperatures up to 1200 C without structural failure. |
Trust & Safety. Meets stringent building codes. |
|
Lightweight |
Reduces the total weight placed on the roof structure,
which is vital for large commercial or industrial buildings |
Precision. Allows for more efficient structural
design. |
|
Seamless &
Taperable |
Can be poured to create a seamless slope, ensuring
positive drainage and eliminating thermal bridging. |
Engineered Endurance. Prevents ponding water,
extending the life of the waterproofing
membrane. |
|
Thermal
Stability |
Maintains its insulation value over time without
sagging, shrinking, or deteriorating due to moisture or
temperature cycles. |
Long-Term Performance. Guarantees Rvalue for the life of the roof. |
|
Compatibility |
Chemically inert and fully compatible with most
liquid and sheet-based waterproofing membranes. |
System Solution. Integrates perfectly with
PROTEC’s waterproofing products. |
| Feature | Expanded Perlite (Mineral) | Thermostyrene (EPS Foam - Plastic) | Expanded Perlite (Mineral) |
|---|---|---|---|
|
Fire Resistance
|
Non-combustible (Class A1/Class 1 rating).
Withstands temperatures up to 1200 C
without structural failure. |
Combustible. Melts and releases dense,
toxic black smoke at temperatures
around 100-120 C |
Safety & Integrity: Essential for
industrial sites, high-rise buildings, and
applications requiring fire-retardant
properties. |
|
Chemical
Stability |
Chemically inert. Does not degrade, dissolve,
or react with common chemicals, asphalt,
or cement. |
Vulnerable to Solvents. Can be dissolved
or damaged by organic solvents often
found in roofing adhesives, some paints,
and certain waterproofing materials. |
Durability & Compatibility: Ensures
the insulation doesn’t compromise
the PROTEC waterproofing system. |
|
Dimensional
Stability |
Excellent. Does not shrink,
expand, or warp significantly with |
Poor. Can experience thermal
contraction and expansion, leading to |
Precision: Maintains a seamless
insulation layer, avoiding costly
heat loss through gaps. |
| Feature | Expanded Perlite (Mineral) | Thermostyrene (EPS Foam - Plastic) | Advantages for PROTEC Clients |
|---|---|---|---|
|
|
Temperature changes. |
gaps, shrinkage, and thermal
bridging over time. |
heat loss through gaps. |
|
Vapor
Permeability |
Breathable. Allows moisture vapor to pass
through, reducing the risk of water
trapping and resulting mold or corrosion. |
Vapor Barrier. Has extremely low permeability;
traps any moisture that enters the assembly,
requiring complex venting. |
Longevity: Protects the underlying
structure (concrete/steel) from internal
condensation and corrosion damage |
|
Application |
Versatile. Used as loose-fill, insulating
concrete screeds (tapered), and
aggregates. |
Limited. Primarily used in pre-formed rigid
boards. |
Tapered Roofs: Perlite concrete is ideal
for creating sloped drainage on flat
roofs where EPS boards would require
complex cutting and multiple sizes. |
|
Compressive
Strength |
Good. Insulating concrete provides a
load-bearing surface. |
Can be poor, especially under
continuous load (creep). |
Load Bearing: Suitable for roof decks
that need to withstand foot traffic or
the weight of equipment |
Significantly enhancing the bond strength of various mortar mixes
Acting as a high-performance additive across a wide range of critical concrete and cement-based repairs and installations