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We are using sliding doors (Reynaers CP130) fitted into traditional cavity walls - 100mm brick, 100mm full-fill PIR, 100mm blockwork. The challenge is to adequately support the track which will largely end up over the cavity. The aluminium track has a plastic thermal break meaning it has little lateral strength and cannot bridge the cavity and carry glass up to 200Kgs without a substantial substrate beneath. Ideas have included mass-filling the cavity with concrete and steel plates across the cavity. However these will both provide significant thermal bridging. A solution we are currently looking at will be to fill the cavity under the track with Leca Insufil and compact by light hand-ramming (it will compact by around 10%). Above this a layer of CF board (Purenit) 40mm or so. Hopefully this combination will provide a firm base which will have low thermal conductivity and minimal impact from moisture, but we are not familiar with these materials used in this type of application. Any thoughts please? Many thanks Peter
