Roofline Closure Systems

• 1. Redundancy of Seals
• 2. Gable-to-Eaves Junctions
• 3. Gable Apexes Formation
• 4. Jointing Pieces/Connectors
• 5. Soffit/Roof Overhangs
• 6. Thermal Bridging
• 7. Lead Flashings

• • Utilise at least two layers of weather protection.
  • Avoid relying solely on sealants for waterproofing.
  • Consider additional redundancy with trim or membrane.
  • Double-seal all joints.
  • Provide secondary waterproofing at eaves.
  • Ensure appropriate system overhang per exposure zone.
• • Use overlapping, prefabricated units.
  • Prohibit site fabrication except for minor trimming.
  • Stagger joints by 100 mm.
• • Use prefabricated elements.
  • Use site bent flashing with secondary lead flashing if necessary.
  • Prohibit site-formed mitre joints.
• • Use connectors with extended sides.
  • Seal connectors to metal profiles.
  • Stagger joints by 100 mm.
• • Embed flashings/trims into masonry or below cement pointing.
  • Overlap joints between redundancy layers by 100 mm.
  • Replace sand and cement fillet with flexible mortar.
• • Ensure insulation continuity for minimum thermal resistance.
• • Limit single-piece lead length to 1200 mm.
  • Follow best practice for overlaps and installation of lead or lead replacement flashings.

* Roofline Closure details that do not meet the requirements above are not acceptable for use with any funded or Private schemes requiring a third party warranty

• 1. Relevant Details
• 2. Existing Overhang
• 3. Rafter Positioning
• 4. Substrate Condition
• 5. Existing Insulation & Potential Cold Bridging
• 6. Corner Details
• 7. Existing Features
• 8. Ventilation

• What will work with the existing roof line/ substrate.
• Ensuring it is consistent across the eaves/ verge.
• Rafters may need to be boxed in, worked around or altered.
• Where grinding in is to be considered, ensure the substrate is stable and will not be damaged by grinding in.
• From installing each detail, ensuring continuity of roof insulation and a minimum thermal resistance of 0.6m²K/W.
• Confirming how the eaves and verge will meet and what the best detail is (where required, which corner profile is suitable).
• Such as corbels and quoins will need to be considered and may prevent these details from being installed, resulting in site specific designs being undertaken in line with the Roofline Closure principles.
• Roof ventilation must not be obstructed/ restricted when installing Roofline Closure Systems.

* Some properties create roof junctions that are extremely difficult to find a solution for, and therefore extending the properties roofline may be the best option.

A Survey Form must be completed to record the survey findings, substrate condition, existing overhangs, etc. The survey form must be submitted to apply for a project warranty.

REQUEST THE SURVEY FORM

• 1. Suitable Base Material
• 2. Minimum Thickness
• 3. Coating Requirement

• • Minimum Aluminium specifications 1050A. Minimum Stainless-Steel specifications 304.
• • 1.2 mm aluminium with a tolerance of +/- 10% to be used for trim widths up to 160 mm.
    For trim widths over 160 mm or trims to be used in exposed areas, (minimum 50 mm overhang) 1.5 mm aluminium must be considered for added strength and stability.
• • Polyester Powder coated aluminium must have a minimum coating thickness of 40 microns to BS or Qualicoat standards and Powder Coaters must be BS or Qualicoat-approved applicators. Pre-coated aluminium must be polyester coated on both sides and the thickness must conform to EN 13523-1.

• Jointing Pieces
• Gable Apexes
• End Caps
• Gable to Eaves Junction
• Downpipe Boxes

• must extend 40mm on each side of a joint
• Prefabricated profiles must be used
• Required on all primary flashings
• Prefabricated corner profiles required
• Required at swan neck junctions