General Site Work and Health & Safety
The following procedures should be adopted when installing Icopal undertile linings:
- Store roofing underlays on end protected from direct sunlight.
- Install Icopal undertile linings in accordance with BS5534:2014 Code of Practice for slating and tiling, BS8000: Part 6:2013 and Icopal fixing instructions.
- Handle and fix the underlay with care to ensure no tears or punctures. Patch repair any tears or punctures prior to tiling or slating using appropriate Icopal tape.
- Ensure that the underlay does not obstruct any ventilation paths.
- Avoid contact of the underlay with the underside of the slates or tiles by excessive drape to prevent wind uplift forces from being transmitted to the slates or tiles.
- Ensure that the underlay provides free drainage into the eaves gutter and no trough is formed behind the fascia board where water will collect. We recommend the use of Monarflex EavesGuard.
- Do not lay undertile linings over undried timber preservatives.
- Terminate the underlay at abutments behind securely fixed and wedged flashings by turning the underlay up 100mm behind the flashing and sealing to brickwork using Monotape.
- Reinforcing strips should be installed at all hips, valleys and ridges.
- Exposed fixing of the membrane should be avoided, particularly staples. Fixing should be made into the rafter along the top edge of the membrane and covered by the overlap of the adjacent sheet.
- Counter battens or tile battens should be installed as soon as possible to fully secure the membrane.
- Ensure that the outer covering of roof tiles or slates are installed as soon as possible following the underlay. The roof tile underlay should not be considered as the primary waterproofing
- Fix the outer covering of roof tiles in accordance with the manufacturers specific instruction and ensure the fixing specification complies with the relevant codes of practice.
- Ensure that any provision for ventilation complies with BS5250: 2011 (Code of practice for the control of condensation in buildings).
Health & Safety Considerations
Construction or replacement of a pitched roof means that you will be working at height and as such personal safety and prevention against a fall must be considered a priority. Roof refurbishment can be complex, is always high risk and demands careful planning.
For detailed information relating to Safety in Roofwork consult HSE publication HSG33.