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I've planned a conversion of an internal garage into living space using lintels to span a 3.6m gap between walls, which is normally a building regulations compliant approach.
I want to put in place floor-to-ceiling doors where the garage door currently stands. The house internal floor is c. 150mm above the level of the garage floor and external ground level. This would approach would require putting the lintels at least below the existing DPC in the walls. This approach would leave the lintels just above ground level, but forming a thermal bridge.
What I would like to do is excavate slightly and install the lintels below ground (the top of the lintel would be level with the ground – ie an existing terrazzo surface that drains away from the house) and have a course of insulating block (eg Marmox thermo blocks) resting on the lintels. However I am concerned there may be issues with building control because the lintels ares below the "frost line".
Do I need to be concerned about building control and a frost issue? Does anyone know of a lintel product that I can specify that would address any concerns?
I want to put in place floor-to-ceiling doors where the garage door currently stands. The house internal floor is c. 150mm above the level of the garage floor and external ground level. This would approach would require putting the lintels at least below the existing DPC in the walls. This approach would leave the lintels just above ground level, but forming a thermal bridge.
What I would like to do is excavate slightly and install the lintels below ground (the top of the lintel would be level with the ground – ie an existing terrazzo surface that drains away from the house) and have a course of insulating block (eg Marmox thermo blocks) resting on the lintels. However I am concerned there may be issues with building control because the lintels ares below the "frost line".
Do I need to be concerned about building control and a frost issue? Does anyone know of a lintel product that I can specify that would address any concerns?