The SPAX-Iso screw is suitable for installing soft materials used in over-rafter insulation. Pressure loads, such as those caused by the roofing or snow loads, cannot be absorbed by soft insulating materials. Partial-thread screws are not suitable for installing soft insulating materials.
Thanks to SPAX-Iso, installing soft insulating materials is not a problem. The fixing thread holds the counter-batten tight and transfers the compressive forces. This keeps the insulating material in shape.
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