Premier Guarantee technical updates: Roofs

This ebook contains a collection of technical updates from Premier guarantee covering roof design, installation, maintenance and performance standards to meet warranty schedule

The first part provides guidelines for “blue roofs”, flat roofs or decks designed to temporarily store rain for a period of time as part of a proposal for a sustainable urban drainage system (SuDS).

It covers design considerations, required performance in terms of BS standards and the Premier Guarantee Technical Manual and design intent, outlining what a blue roof design must demonstrate on a roof or deck slab to comply with the Premier Guarantee Technical Manual.

The guidance includes detailed requirements for a design submission, looking at the subsoil; waterproofing; disposal; rainwater drains; insulation, condensation risk and flotation; movement joints; sheet penetrations and access facilities; surface finishes; building abutments and detailing; and architectural features.

In addition, there are requirements for installation and testing, operation and maintenance, and illustrations of blue roof layers.

Further updates

The ebook includes further technical updates on: flashing and weathering details of the canopy; Requirements for glass-reinforced polyester (GRP) roofing; Lead neoprene joints; and mortar-embedded backs and hips mechanical attachment.

There are also guidelines for “fake” or “alternative” lead flashing systems, which are becoming increasingly popular on construction sites. Alternative systems are lighter than lead and easier to install, require no hot work or specialist equipment, and may be a more cost-effective option given the rising cost of lead.

These systems are acceptable to meet the requirements of: Premier Guarantee’s Warranty Technical Guide, provided they have a UKAS or European equivalent third party independent product approval certification such as a BBA or BDA.

Finally, the ebook includes a knowledge management article on TRADA span tables, which cover section dimensions and spans for solid wood elements in floors, ceilings and most roofs, and are one of three resources listed in the technical manual to meet the requirements of approved document A of the Building Decree.

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