Klober Permo Forte is an extremely strong, four-layer roof underlay with a built-in safety grid. The low vapour resistance, permeable roof membrane is available with or without self-adhesive tape and is suitable for pitched roofs. It is a particularly effective solution for controlling condensation, whilst the self-adhesive tape creates a secure airtight seal, reducing energy loss. Permo Forte is a BBA approved low resistance roof membrane. Area of application Suitable for Cold and Warm Roofs. Wind zones 1-4 with battened headlap. All wind zones with taped headlap. Key Features 4-layer vapour permeable membrane. Reinforced grid provides superior strength and added safety benefits. BBA approved low resistance membrane. Also available with fitted self-adhesive strips to provide water tightness and strong protection against winds. All products supplied by Klober are covered by its 10 year guarantee.