Heavy Duty Fletcher Permastop® Building Blanket Insulation

$ 9.11$ 12.92 p/m2 inc. GST

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✘ No warehouse pickups

Heavy Duty Permastop Blanket is made with Sisalation® reflective foil facing on one side to act as a barrier against condensation forming on the underside of metal roofs.

Actual Area (sq m)
Total Price

Heavy Duty Fletcher Permastop Roofing Blanket for Roofs

To increase the comfort and energy efficiency of the buildings we work and live in, the right choice for effective insulation performance is Fletcher Permastop Roofing Blanket. As more and more buildings, both commercial and domestic, are being built with metal deck roofing and metal wall cladding the need to install the right insulation is crucial.

Install Applications for Permastop Roofing Blanket

A diagram showing Permastop Roofing Blanket Application - Flat metal roof with no ceilingApplication: Flat metal roof with no ceiling

Permastop roofing blanket installed over purlin support located between cladding & safety mesh incorporating Roof Rack Spacers to allow for blanket recovery to nominal thickness. Metal roof at 0 to 5° pitch, purlins may be at various centres.

TOTAL R-value 100mm = R 2.9 (Winter) R 3.2 (Summer)
TOTAL R-value 130mm = R 3.4 (Winter) R 3.7 (Summer)


A diagram showing Permastop Roofing Blanket Application - Flat metal roof with suspended ceiling

Application: Flat metal roof with suspended ceiling

Permastop roofing blanket installed over purlin support located between cladding & safety mesh incorporating Deckmate™ Thermal Spacers to allow for blanket recovery to nominal thickness. Air space below foil assumed to be unventilated 100mm to 600mm air space. (Flat metal roof at 0 to 5° pitch)

TOTAL R-value 55mm = R 2.2 (Winter) R 3.3 (Summer)
TOTAL R-value 75mm = R 2.7 (Winter) R 3.8 (Summer)
TOTAL R-value 100mm = R 3.4 (Winter) R 4.5 (Summer)


A diagram showing Permastop Roofing Blanket Application - Metal roof at 22.5° pitch with flat ceilingApplication: Metal roof at 22.5° pitch with flat ceiling

Permastop roofing blanket draped over battens allowing full recovery between battens of the product’s nominal thickness, with R2.5 Pink Batts installed on 10mm Plasterboard ceiling. Reflective foil faces the Non-ventilated attic space.

TOTAL R-value 55mm = R 4.8 (Winter) R 4.9 (Summer)
TOTAL R-value 75mm = R 5.3 (Winter) R 5.4 (Summer)




Compliance: This performance report is based on thermal resistance tests and calculations conducted in accordance with AS/NZS 4859.1 (2002) – Amendment 1 (2006).

Permastop with

Heavy Duty Sisalation

Material R-Value




Roll Size

Fletcher Code





18 m2






18 m2






12 m2






12 m2






12 m2






12 m2






7.8 m2


The right thermal insulation

Permastop glasswool blanket insulation faced with Sisalation® is available in material R-value of R1.3, R1.8, R2.5 and R3.0 and nominal thickness of 55mm, 75mm, 100mm and 130mm. With the requirements of the Building Code of Australia demanding a Total R-Value of R3.2 in many constructions you can be confident that correctly installed, Fletcher Permastop will comply. Installing the correct insulation greatly improves the comfort of occupants by reducing the extremes of temperature and thereby reducing the need for artificial heating and cooling saving money and helping the environment.

The right acoustic insulation

Metal Deck roofing and wall cladding is a popular choice due to it’s lightweight, economy and suitability for the Australian climate. While many people enjoy the sound of rain on the roof it can become deafening in extreme conditions, especially hail. Permastop Roofing Blanket is not only an effective thermal insulation but acts as a baffle to reduce sound transmission both from outside and inside sources. The acoustic performance of 75mm Fletcher Permastop can reduce rain noise by as much as 18dB(A) compared to a metal roof with no insulation. Permastop also stops noise from the rapid expansion of metal deck roofs under the sun. For both domestic and commercial applications Permastop is the right choice to control noise down under.

Condensation & dust protection

When you create an atmosphere of warmth or coolness inside the building or home in contrast to the outside temperature, condensation can form on the underside of the metal roof or wall.
To aid in the control of condensation Permastop is faced with a moisture barrier of high quality Sisalation® foil. Not only does the Sisalation enhance the thermal quality of Permastop glasswool insulation it also acts as a non-permeable barrier to moisture. Another bonus is that the transmission of dust is reduced and in bushfire prone areas Permastop Roofing Blanket assists in preventing burning embers from entering the roof space. Permastop glasswool insulation is non-combustible.

The benefits of Permastop Blanket

  • Provides excellent thermal insulation properties, keeping homes and buildings cooler in summer and warmer in winter.
  • Minimises the risk of condensation.
  • Reduces energy usage to deliver cost savings.
  • Excellent acoustic properties – reduces rain noise.
  • Faced with industry leading Sisalation® reflective foil laminate in your choice of Light, Medium or Heavy duty strength.
  • Available in customised lengths to improve installation efficiencies.
  • FBS-1 Glasswool Bio-Soluble Insulation® – safe to use.
  • Good Environmental Choice Australia (GECA) certified.
  • Codemark certified.
  • Manufactured from up to 80% recycled content.
  • Satisfies Bushfire Attack Level (BAL) requirements of 0-40 in roof applications and 0-FZ in wall applications (in accordance with AS 3959 – 2009).
  • Australian made.

High Quality Performance – Contact Us for Bulk Order Insulation Blanket Price

Permastop glasswool blanket insulation is made in Australia to Australian standards using FBS-1 bio soluble glasswool. Fletcher Permastop Roofing Blanket has the best possible fire rating when tested to AS1530.3. Early fire Hazard requirements. The glasswool component is noncombustible and the Sisalation® used has a flammability index of less than 5 when tested to AS1530.3. Guaranteed for the life of the home, Permastop is the quality choice of leading builders and roofers.

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