Planning roof upgrades across a housing estate

Record the metering period and which rooms were heated during it. This makes heat consumption easier to compare across blocks of similar size.

Mark leaks and signs of damp on the plan of each roof. Ask the property manager where residents have reported cold rooms or stuffy air. Use those observations alongside the energy assessment and the building condition survey when prioritising repairs.

If several blocks share a boiler plant, give the designer the retrofit dates for each building. Heat demand will change in stages. If the plant needs urgent replacement, consider how it will operate both while some blocks are still uninsulated and once the estate upgrade is complete.

Survey the roof terminals, vent pipes, outlets and maintenance routes. Raising the finished roof level changes the clearance at these details. If windows are replaced, check the air supply to the flats too. Agree the loads and fixings for any proposed solar array before completing the roof.

At a low threshold, draw the deck, falls, insulation and membrane upstand to scale. Compare boards using the declared thermal conductivity of each product. PIR may provide the required thermal resistance in a thinner layer. The section must also accommodate a watertight threshold and a clear drainage path.

For each option, confirm permissible loads, fixing method and compatibility between the facing and the membrane. If the tender also covers a rendered façade, specify that system separately. A board used beneath a roof membrane needs separate evidence of suitability for a rendered wall.

List the roof area, flashing lengths and numbers of outlets and penetrations for each block. Price access, deck repairs and equipment reinstatement separately. The breakdown will show why two roofs of similar size can cost different amounts.

Agree when the contractor will present the deck and concealed layers for inspection. Mark the location of each photographed detail on the roof plan. Give the manager the dates of heating outages and restrictions on entrances and common areas so residents can be notified.

After insulation, check heat distribution between risers and temperatures on the top floor. Use those observations to set the controls and balance the system. If the estate programme also includes a school, match its heating schedule to teaching hours and periods of vacancy.

For rooftop solar, compare expected generation and consumption over matching hours. Annual totals can conceal a summer surplus and a shortfall in the heating season. Use the time profile when assessing a storage option.

After the heating season, compare delivered energy with the baseline period. Record differences in weather, indoor temperatures and the number of occupied flats. Account for price changes separately. If reporting an emissions reduction, identify the heat source used in the calculation.

Hand the maintenance team a roof plan showing access to outlets, repair locations and material specifications. Inspection records should identify details that need a further check or replacement. When planning the next phase, consider service life, repairability and what can be done with the materials when removed.