PERMAVENT APEX WIND UPLIFT RESULTS. BS 5534: 2014 Code of practice for slating and tiling. 1m x 50m Roll. Our latest product range includes artificial grass. Artificial Grass >>. NOTE 2: Zone suitability applies only for underlays in applications where a well-sealed ceiling is present, ridge height is not greater than 15m, roof pitch is between 12.5° and 75°, site altitude is not greater than 100m and no significant site topography is present.
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