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.
Scope of use
Roof Application
- Suitable with masonry tile, metal tile and profiled metal roof cladding.
- Direct fix or cavity fix.
- Can be used on roofs up to and including NZS 3604 ‘Extra High’ wind zones.
- Refer to installation guide regarding underlay support requirements.
- Will provide temporary weather protection during construction (maximum 7 days), same day coverage recommended.
Wall Application
- Suitable for use with both timber and steel framing, either direct fix or in conjunction with an 18mm minimum drained cavity.
- Can be used with absorbent wall claddings (e.g. timber, brick or fibre cement) or non-absorbent wall claddings (e.g. metal or plastic).
- Can be used with masonry veneer in accordance with NZS 3604.
- Suitable for buildings situated in NZS3604 Building Wind Zones up to and including ‘Very High’.
- Thermakraft 215 can be used as an air barrier to reduce wind entry and is highly water resistant.
- Will provide temporary weather protection during construction (maximum 28 days).
General
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.
Limitations
- In both roof and wall applications must NOT be exposed to the weather or UV for more than 7 days.
- Must NOT be used under translucent sheeting.
- Is not fire retardant.
- Not suitable for School Property, please refer to Ministry of Edcuation; Weather-Tightness & Durability requirements for School Property.
Compliance
Thermakraft 215 meets the requirements of NZBC Acceptable Solution E2/AS1, Table 23 and NZS 2295:2006 for both wall & roof underlay.
Durability
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:
- It is installed in accordance to Thermakraft Installation Guide.
- Run length is no greater than 10 meters.
- Is NOT left exposed to the weather or UV for more than 7 days on roof.
- Is NOT left exposed to the weather or UV for more than 28 days on walls.
- Is installed by or under guidance of Licensed Building Practitioners.
- Is installed by or under guidance of Licensed Building Practitioners.
- Is installed in accordance with the MRM Code of Practice.
- Is compatible with cladding system used.*
* Note: roof cladding system compatibility testing must be done first before installation.
Product Warranty
Standard Thermakraft warranty applies. Refer to Thermakraft Warranty Statement for further details. This item is available online here or call 0800 806 595.
Product Performance
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).
| 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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