Quick question.   The yellow membrane which goes on top of the EPS but under the concrete and UFH hangs over the edge of the EPS on various amounts round the perimeter of the house. What do we do with this? We are thinking of having like an aluminium fascia (?) going round the bottom below the render or cladding to cover the EPS.   Our internorm Lift and slide doors are just going in and the are wondering what to fix the external sill (?) onto with the yellow membrane being t