EXTERNAL WALL INSULATION SYSTEMS / PHENOLIC /
TECHNICAL PERFORMANCE
ACCREDITATION & PERFORMANCE
The PermaRock Phenolic System has been assessed by BRE-Certifications (WIMLAS Certificate No. 041/97) as suitable for use on masonry, dense and no-fines concrete, timber frame and metal frame walls.
The system has an assessed lifetime in excess of thirty years.
AIR LEAKAGE
Buildings that are clad with the PermaRock Phenolic System exhibit minimal air leakage through the external walls.
CONDENSATION CONTROL
PermaRock advises assessment of condensation risk in accordance with BS 5250. Full and comprehensive condensation risk and U-value analyses can be provided for specific wall constructions under any combination of environmental conditions and for any building usage.
DENSITY AND STRENGTH
PermaRock Phenolic Insulation Boards have an average density of approx. 50 kg/m3 and compressive strength of minimum 120 kPa.
The light weight and high strength of the system makes it ideally suited for application to problem substrates and for the refurbishment of high rise structures.
DURABILITY
The assessed lifetime of the system is in excess of 30 years in accordance with BRECertifications WIMLAS Certificate No. 041/97.
ENVIRONMENTAL
Buildings insulated with the PermaRock Phenolic External Wall Insulation System can achieve very low U-values resulting in considerable heat loss reductions and reductions in energy consumption.
PermaRock Phenolic Insulation Boards are CFC and HCFC free and do not employ ozone depleting chemicals in their manufacture - the system has zero ozone depletion potential (ODP). PermaRock Phenolic insulation has an embodied energy of approx. 140 MJ/m2 (40 mm thick).
FIRE PERFORMANCE
The PermaRock Phenolic External Wall Insulation System meets the requirements of Building Regulations Approved Document B (England & Wales), Part D (Scotland) and Part E (Northern Island).
The system with a mineral finish complies with the requirements of Fire Note 9 and can be used on high rise buildings without fire stops. Where other decorative finishes are employed, the system must incorporate fire barriers at intervals of no less than the line of every floor level above ground floor in the construction and where a compartment wall abuts, as recommended by and defined in BRE Defect Action Sheet 131. Refer also to BRE 135, Second Edition.
IMPACT RESISTANCE
The PermaRock Phenolic system can withstand mechanical impact and abrasion without cracking or spalling. Resistance to soft and hard bodies complies with the recommendations of BRE publication BRE 6/81. Depending on specification, systems can achieve levels of impact resistance ranging from approx. 4J to in excess of 40J.
SERVICE TEMPERATURE
The PermaRock Phenolic System has high flexibility and can be designed to withstand the thermal shocks associated with climatic changes and will provide effective service at temperatures ranging from -20 ºC to +80 ºC.
WATER RESISTANCE
In-house testing and extensive assessment by BRE-Certifications have confirmed the performance of the PermaRock Phenolic External Wall Insulation System in relation to water penetration resistance.
The system with a dash finish is classified as Type 4 insulating cladding for permeability to water, as defined in UEAtc MOAT No. 45, and is suitable for geographical areas including those classified as having very severe exposure to wind driven rain (BS 5628: Part 3 and BS 8104).
WATER VAPOUR PERMEABILITY
PermaRock Phenolic insulation boards have a vapour resistivity of 300 MNs/gm. The PermaRock Phenolic system with 50 mm insulation and dry dash aggregate finish has a measured vapour resistance of >9 MNs/g (BS7374, ReferenceBRE Certificate 041/97).
The system can be considered as a vapour control layer when tested in accordance with BS 4370: Part 2: 1993.
WIND RESISTANCE
The system is designed to withstand high wind load and suction pressure. The values should be calculated in accordance with BS 6399: Part 2. Mechanical tests on the system using the recommended fixings have shown that the system will adequately resist wind forces in the UK.