As discussed on the phone we are looking to have our flat roof (extension at the back of the house) insulated and the roof covering replaced, as the current and we’ve had a leak into our son’s bedroom below – probably where the drain enters the roof. A builder said the roof covering should be below the black bit around the bottom of the drain, not above.
The roof is roughly 2.25m x 6.35m. I’ve just realised that it will be dark by the time I get home tonight, so I’ll take pictures tomorrow morning.
We have been considering high-performance mineral felt or EPDM as a roof covering. What would you suggest?
As I said I looked at the Energy Saving Trust website which says a flat roof should preferably be insulated from above, by installing a layer of rigid insulation board on top of the timber roof surface with a new weatherproof layer on top of the insulation.