Product Scope and Summary of certificate...
This Certificate relates to Weathertight Durable Roof Underlay for use in tiled and slated ventilated pitched roofs in unsupported or supported applications.
AGREEMENT CERTIFICATION INCLUDES:
- factors relating to compliance with Building Regulations where applicable
- factors relating to additional non-regulatory information where applicable
- independently verified technical specification
- assessment criteria and technical investigations
- design considerations
- installation guidance
- regular surveillance of production
- formal three-yearly review.
KEY FACTORS ASSESSED
Weathertightness — as part of a complete roof, the product will resist the passage of water and wind-blown snow and dust into the interior of the building (see section 5).
Wind loading — when installed on appropriately spaced battens the product’s physical properties are deemed adequate to resist the wind loads imposed on the underlay. The product will reduce the wind uplift forces acting on the roof covering (see section 7).
Strength — the product has adequate strength to resist the loads associated with the installation of the roof (see section 8).
Durability — under the normal conditions found in a roof space the product will have a service life comparable to a traditional roof tile underlay (see section 11).