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THERMAKRAFT 215
Self-supporting bituminous wall and roof underlay.
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Commonly referred to as “Building Paper” Thermakraft 215 is a self-supporting,
kraft paper based, bituminous building underlay that is suitable for use on roofs and walls in residential buildings. It is vapour permeable, meaning that liquid water from the outside is prevented from penetrating but water vapour from the inside can pass through and escape the building envelope. Thermakraft 215 is easy to install.
Product Specifications
Thermakraft 215 comes in three roll sizes:
Width | Length | Coverage |
---|---|---|
1250mm wide | 12m long | 15m² coverage * |
1250mm wide | 20m long | 25m² coverage* |
1250mm wide | 40m long | 50m² coverage* |
*Note: M2 is the roll size for actual coverage, allow for laps and joins.
Roof Application
Wall Application
Unaffected by LOSP or other solvent based treated timber. However, LOSP or other solvent based treated timber must have sufficient time for the solvent to flash off in a well ventilated area. Recommended minimum 7 days.
Thermakraft 215 meets the requirements of NZBC Acceptable Solution E2/AS1, Table 23 and NZS 2295:2006 for both wall & roof underlay.
Meets the Performance Requirements of NZBC Clauses B2, Durability B2.3.1 (a) 50 years, B2.3.1 (b) 15 years and B2.3.2), E2 External Moisture providing:
* Note: roof cladding system compatibility testing must be done first before installation.
Standard Thermakraft warranty applies. Refer to Thermakraft Warranty Statement for further details. This item is available online here or call 0800 806 595.
NZBC E2/AS1 Wall Underlay Requirements
NZBC E2/AS1 Table 23 (NZS2295) Roof Underlay Properties | Absorbancy* | Vapour Resistance | pH of Extract | Shrinkage | Water Resistance |
---|---|---|---|---|---|
Property Performance Requirement | ≤150gsm | ≤7 MN.s/g | ≥ 5.5 and ≤ 8 | ≤ 0.5% | 100mm for 24 hours |
Property Performance | Pass* | Pass | Pass | Pass | Pass |
* Absorbency test done by BRANZ using section 8 of Study Report SR228 (2010).
NZS2295:2006 Classification
NZBC E2/AS1 Table 23 (NZS2295) Roof Underlay Properties | Flammability Index | Wind Zone | NZS2295:2006 Index |
---|---|---|---|
Property Performance Requirement | R2 | R2 | |
Property Performance | Non-Fire Retardant | Up to Extra High | Self-Support |
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