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ASSESSMENT CRITERIA
ACTMAP 1 PART 4: PERFORMANCE CRITERIA
FITNESS FOR USE (EXCEPT DURABILITY)
General
Appropriate test methods and criteria for durability will be given in the specific ACTMAPs to be prepared for certain families of waterproofing materials.
Behaviour in fire
The criteria are given in deemed-to-satisfy rules TT12.1 to 12.5 inclusive, of SABS 0400.
Criteria for products used in all roofing systems without heavy protection
Criteria common to all systems
Resistance to wind action. The roofing system is considered to be adequate for the specific wind pressure conditions concerned if failure does not occur during the test. The different modes of failure are described in 'Test for resistance to pull-off under suction'.
Resistance to peel. This test is usually carried out before the test for resistance to wind action (see the notes at the beginning of 'Test for resistance to pull-off under suction' and 'Test for resistance to peel'). It is a comparative test, which may assist in establishing whether suction tests are necessary for particular waterproofing systems, methods of application and substrates.
Resistance to thermal shock. There must be no loss of bond or permanent deformation or failure at the joints. ('Test for resistance to thermal shock'.)
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Dimensional stability. If the free shrinkage ('Test for unrestrained shrinkage') does not exceed 0,3 % in both directions the membrane is acceptable. If the free shrinkage exceeds 0,3 %, the restrained shrinkage test is carried out until stabilisation is achieved (under the relevant conditions of installation: bonded or loose laid under ballast). The restrained shrinkage must not exceed 0,3 % in both directions.
Resistance to sliding. Applies only to materials in bonded sheet roofing systems on Class III sloping roofs and bonded upstands without mechanical fixings. No slippage of the material should occur.
Resistance of cyclic fatigue. There must be no cracking, tearing or failure of the system after 500 cycles for new material or after 200 cycles for material aged for 28 days at 80 ± 3 °C. The classification achieved must be noted and interpreted for the particular roofing system.
Resistance to impact
- Static puncture. The classification achieved by the waterproofing material and its significance must be stated. A classification of L1 is not acceptable.
- Dynamic puncture. The classification achieved by the waterproofing material and its significance must be stated. Classification of D1 and G1 are not acceptable.
Permeability to water vapour. The permeability of water vapour should not exceed the following:
- 0,05 g/m² over a period of 24 hours for sheet materials.
- 10 g/m² over a period of 24 hours for in situ liquid-applied systems.
Resistance to hail. The classification achieved by the products as used in the roof waterproofing system and its significance must be stated.
Additional criteria for single layer systems
Resistance to water pressure. No leakage should occur during the test.
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Resistance to leakage at joints. No leakage should occur during the test.
Tensile strength of joints. Failure should occur outside the joint and the tensile strength must be stated in MPa.
Resistance to leakage and tensile strength of joint after
exposure to heat
exposure to moisture
No leakage should occur during the test. Failure should occur outside the joint and the tensile strength must be stated in MPa.
Criteria for roofing systems with heavy protection
Heavy protection should be removable, particularly when the waterproofing is a single layer system.
Resistance to wind action. Not applicable.
Peel strength. Not applicable.
Resistance to thermal shock. Not applicable.
Dimensional stability. If the free shrinkage ('Test for unrestrained shrinkage') does not exceed 0,3 % in both directions the membrane is acceptable. If the free shrinkage exceeds 0,3 %, the restrained shrinkage test is carried out until stabilisation is achieved (under the relevant conditions of installation: bonded or loose laid under ballast). The restrained shrinkage must not exceed 0,3 % in both directions.
Resistance to sliding. Applies to materials bonded to upstands without mechanical fixings. No slippage of the material should occur.
Resistance to cyclic fatigue. There must be no cracking, tearing or failure of the system after 500 cycles for new material or after 200 cycles for material aged for 28 days at 80 ± 3 °C. The classification achieved must be noted and interpreted for the particular roofing system.
Resistance to static puncture. The roofing material must achieve classification:
- L3 with loose protection (gravel or similar)
- L4 with solid protection (slabs or similar).
Resistance to impact. The roofing material must achieve classification:
- D3 and G3 with loose protection (gravel or similar)
- D4 and G4 with solid protection (slabs or similar).
DURABILITY
Reference should be made to the criteria in the specific ACTMAPs for each type of roofing when available.
Reference should also be made to the section on durability tests in Part III.
WORKABILITY
General. The requirements aim to reveal some important workability characteristics of roofing sheets from which any restrictions in application could be derived.
Resistance to tearing. The force required to tear each of the materials must be equal to or higher than 50 N.
Flexibility at low temperatures. The waterproofing must be laid on site at temperatures that are at least 5 °C above the temperature at which cracking was found to occur.
Unrolling at low temperature. When unrolling at 0 °C, there should be no cracking or tearing of the material.
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