ᐅ Foundation detailing, brick masonry in contact with backfilled soil
Created on: 3 Feb 2020 11:35
S
Seppo001Hello forum community,
My name is Sebastian, I am 37 years old, and my wife and I plan to build a single-family house made of bricks this year.
Since my cousin is a mason, we will construct the foundation slab and the shell ourselves. So far, everything is fine. However, there are differing opinions regarding the plinth detail between my cousin and our architect.
The house will have no basement but will be partially backfilled to a height of about 1.5 meters (5 feet) above the foundation slab.
My cousin recommends extending the foundation slab a few centimeters beyond the masonry in this area and then forming a cove fillet. This will be sealed with two layers of bituminous thick coating and reinforcing fabric, overlapping from the foundation slab up to about 20 cm (8 inches) above the backfill. The foundation slab below the backfill will not be insulated on the exposed end face.
Our architect proposes placing a base stone (Kimmstein) flush with the foundation slab and having the masonry extend beyond it. The area beneath the masonry overhang would then be waterproofed, with insulation against the soil above that (see attachment). Although many brick manufacturers depict this setup similarly, it is always shown without soil backfill. In that case, the masonry overhang must always be about 30 cm (12 inches) above ground level.
I am somewhat concerned about the architect’s version in terms of achieving true waterproofing below ground, since the waterproofing is applied under the perimeter insulation. I need to ensure that the overhanging bricks are securely sealed from below.
It would be great if someone could share their opinion.
Best regards
Sebastian
My name is Sebastian, I am 37 years old, and my wife and I plan to build a single-family house made of bricks this year.
Since my cousin is a mason, we will construct the foundation slab and the shell ourselves. So far, everything is fine. However, there are differing opinions regarding the plinth detail between my cousin and our architect.
The house will have no basement but will be partially backfilled to a height of about 1.5 meters (5 feet) above the foundation slab.
My cousin recommends extending the foundation slab a few centimeters beyond the masonry in this area and then forming a cove fillet. This will be sealed with two layers of bituminous thick coating and reinforcing fabric, overlapping from the foundation slab up to about 20 cm (8 inches) above the backfill. The foundation slab below the backfill will not be insulated on the exposed end face.
Our architect proposes placing a base stone (Kimmstein) flush with the foundation slab and having the masonry extend beyond it. The area beneath the masonry overhang would then be waterproofed, with insulation against the soil above that (see attachment). Although many brick manufacturers depict this setup similarly, it is always shown without soil backfill. In that case, the masonry overhang must always be about 30 cm (12 inches) above ground level.
I am somewhat concerned about the architect’s version in terms of achieving true waterproofing below ground, since the waterproofing is applied under the perimeter insulation. I need to ensure that the overhanging bricks are securely sealed from below.
It would be great if someone could share their opinion.
Best regards
Sebastian
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