EPDM rubber warm roof being installed over old decking using a new vapour barrier and thermally broken fixings. The guttering and gutter board has been removed so that the insulation can be fixed between the joists, continuing the insulation of the new warm roof down to the wall of the building. When installing a new warm roof ,this area is often forgotten its rather like sleeping under your quilt and not tucking in the edges, so you get cold spots along the edges. Cold spots or cold bridging in new warm roof construction is becoming a big issue; the more we insulate our roofs and buildings the more we control the movement of air and the moisture in that air vapour control is extremely important; cold bridging and warm moist air is a disaster waiting to happen. In the right conditions, condensation will form where there is cold bridging, and rot can set in. The worst case scenario is that the condensation can drip from the area of cold bridging and cause water damage to the building ceiling or walls. Controlling condensation cold bridging and sweating is all part of the Thermal Design of the roof and, realistically, the building. It is important to thermally design an element of a building such as the roof, taking into consideration the other elements of the building change one and you could be changing all of them.