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Upgrading flat roofs can be relatively straightforward to achieve. The main considerations are:
- Increasing the thermal performance, or U-value, of the roof build-up
- Maintaining the waterproof membrane
- Avoiding thermal bridging at the junction with the wall insulation.
Flat roofs are insulated by adding rigid insulation boards above the existing structure. Decisions to be made include:
- Whether to remove or retain the existing waterproof layer
- Whether to choose a warm or inverted roof solution
- How to overlap with any EWI and maintain continuity.
Warm roofs are preferred. As with inverted roofs, there is a tendency for cold rainwater to percolate between the insulation to the waterproof layer. However, inverted roofs have the advantage that the roof membrane is protected. Typically, additional roof timbers are required to carry an extended eaves and fascia to accommodate the EWI.