Permavent Easy Slate: Waterpoof Low Pitch System - Low Pitched Tiled Roofing Support System

The Easy Slate System is a patented roofing solution designed to enable the use of slate on low pitch roof constructions while maintaining weather resistance.

The system is intended for use with double lapped natural and fibre cement slates where conventional slate detailing would not provide adequate protection against water ingress at reduced pitches.

Easy Slate allows natural slates to be installed at rafter pitches as low as 12° and fibre cement slates at rafter pitches down to 10°. This enables double lapped slate roofing to be specified on projects where ridge heights or roof pitches are restricted, including domestic, commercial, and heritage buildings subject to planning limitations.

At low rafter pitches, water ingress can occur due to capillary action at the perpendicular (perp) joints between slates. The Easy Slate System addresses this by sealing the perp joint, preventing water from tracking between adjacent slates and entering the roof structure. This improves weather resistance in conditions where standard double lapped slate installations may be unsuitable.

The Easy Slate System has been tested at the Building Research Establishment (BRE) to assess its suitability for low pitch slate roofing applications. Testing confirms its performance in resisting water ingress, supporting its use as a reliable solution for reduced-pitch double lapped slate roofs when installed in accordance with manufacturer guidance.

FEATURES AND BENEFITS:

• Minimum Pitch: Supports natural slate at 12° and fibre‑cement at 10°, without compromise on weatherproofing.
• Proven Performance: Seals the perp‑join against capillary action – BRE‑tested for durability and water‑tightness.
• Condensation Control: Breathable membrane manages vapour, keeping the roof space dry.
• Battten Protection: Prevents moisture transfer to battens, extending service life.
• Traditional Finish: Works with standard slating methods and most slate types, with no visible change to the roof’s appearance.
• Made in Britain: Manufactured to BS 5534:2014 + A2:2018 standards.

Whether you’re refurbishing a heritage property or planning a new build with constrained ridge heights, the Easy Slate System delivers a reliable, long‑lasting low‑pitch solution.

Easy Roof System 40 Year Guarantee

We are so confident that our products are of the highest quality that we offer a 40-year product guarantee against the waterproofing integrity of the roof structure, providing the following criteria is met:

• The installation must be installed as per the manufacturer’s instructions and in accordance with BS 5534:2014 + A2:2018. Code of practice
• The specified membrane must be PERMAVENT DRY+
• The specified tape must be PERMAVENT BUTYL TAPE
• The contractor must record both in-progress and completed project images to be supplied alongside invoices at the time of guarantee application
• Guarantee applications must be submitted no later than 1 month after project completion

Please note each Easy Roof installation requires its own submission.