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I understand that in garage conversions, you can avoid new foundations by spanning two walls that are properly supported by existing foundations with two concrete lintels and then build masonry walls on the lintels.
My application is a lightweight extension structure that is heavily glazed to three sides, using three glulam posts and beams to form the guts of the structure.
Rather than traditional foundations, I would like to (1) use three post footings (eg 400mm x 400mm x 250mm pad, 250mm x 250mm x 1400mm column (depth because of trees), with rebar cage within); (2) secure post holders to the columns and; (3) rest or fix the ends of the concrete lintels on the columns.
I have shown a crude sketch below (interim drawings attached in a pdf) with the post footings shown as cylinders. From a site prep perspective, what I have in mind is use an auger to get three holes dug of sufficient depth, perhaps line the bottom with compacted gravel/ concrete, put in place rebar cage, cast the pile, cast the column, backfill the hole, use the columns as the basis of the structure.
The load on the soil is much less than a masonry or steel structures. The lintels are well able to cope with glazing load.
Questions
If I set the lintels into a screed, will that suffice to fix them in place? Can you "clamp them"
How "out there" is this as a concept for a permanent extension eg are building control used to approving such a design? Or is it meat and drink and no big deal (Part L energy aspects are fully covered off in the design).
All advice welcome, thanks in advance
My application is a lightweight extension structure that is heavily glazed to three sides, using three glulam posts and beams to form the guts of the structure.
Rather than traditional foundations, I would like to (1) use three post footings (eg 400mm x 400mm x 250mm pad, 250mm x 250mm x 1400mm column (depth because of trees), with rebar cage within); (2) secure post holders to the columns and; (3) rest or fix the ends of the concrete lintels on the columns.
I have shown a crude sketch below (interim drawings attached in a pdf) with the post footings shown as cylinders. From a site prep perspective, what I have in mind is use an auger to get three holes dug of sufficient depth, perhaps line the bottom with compacted gravel/ concrete, put in place rebar cage, cast the pile, cast the column, backfill the hole, use the columns as the basis of the structure.
The load on the soil is much less than a masonry or steel structures. The lintels are well able to cope with glazing load.
Questions
If I set the lintels into a screed, will that suffice to fix them in place? Can you "clamp them"
How "out there" is this as a concept for a permanent extension eg are building control used to approving such a design? Or is it meat and drink and no big deal (Part L energy aspects are fully covered off in the design).
All advice welcome, thanks in advance