Beam and block
On its own, beam and block floor construction will not satisfy the principles of Passivhaus design mentioned previously. By its very nature, ventilation is created under the system allowing air movement in and around the floor structure. The simplest strategy is to treat the beam and block floor as providing support only. To achieve Passivhaus performance levels, a taped windtightness membrane can be laid over the beam and block and carefully joined in with the wall windtightness layer. Insulation should then be added to the required depth on top, with the top screed over. The screed will also become the floor’s airtightness layer but will need taping into the wall airtightness layer, as the screed will shrink back from the internal walls during drying out.