Hello everyone,
Since quite a few things have gone wrong with our new build, I would like to ask for advice/information regarding the installation of insulation and waterproofing between the exterior wall and the concrete slab.
Construction details:
- Frost skirt with concrete slab poured on top
- Interior wall first and second course on a horizontal damp-proof course
- 16 cm (6 inches) insulation
- Facing brick
I found the attached drawing online, which matches our setup except for the frost skirt.
I have the following questions:
1. Is the illustrated construction correct, or are there better options?
2. A perimeter insulation is applied to the front side of the concrete slab – how deep should this be installed? Is it enough to reach down to the bottom edge of the slab, or how deep and what thickness is recommended?
3. How and how deep should the front side of the slab be sealed, and which material is best (e.g., waterproof slurry, bitumen membrane)?
Unfortunately, our architect has left us without answers regarding these detailed questions.
Thank you to everyone who takes the time to read and possibly respond.
Best regards,
Ralf
Since quite a few things have gone wrong with our new build, I would like to ask for advice/information regarding the installation of insulation and waterproofing between the exterior wall and the concrete slab.
Construction details:
- Frost skirt with concrete slab poured on top
- Interior wall first and second course on a horizontal damp-proof course
- 16 cm (6 inches) insulation
- Facing brick
I found the attached drawing online, which matches our setup except for the frost skirt.
I have the following questions:
1. Is the illustrated construction correct, or are there better options?
2. A perimeter insulation is applied to the front side of the concrete slab – how deep should this be installed? Is it enough to reach down to the bottom edge of the slab, or how deep and what thickness is recommended?
3. How and how deep should the front side of the slab be sealed, and which material is best (e.g., waterproof slurry, bitumen membrane)?
Unfortunately, our architect has left us without answers regarding these detailed questions.
Thank you to everyone who takes the time to read and possibly respond.
Best regards,
Ralf
Good evening,
I may not have deep technical expertise, but I can share how we handle this in our company.
As far as I know, facing bricks or cladding are not installed directly on the slab but on the foundation. A protective tape is applied underneath, as shown in the drawing. I have not heard of using water-repellent mortar, nor that it is commonly used. Otherwise, I don’t find the approach incorrect. Open joints at the top should be left for drainage, but normally we install joint ventilators to prevent too much debris or insects from entering. Installing them at the bottom is also reasonable.
I may not have deep technical expertise, but I can share how we handle this in our company.
As far as I know, facing bricks or cladding are not installed directly on the slab but on the foundation. A protective tape is applied underneath, as shown in the drawing. I have not heard of using water-repellent mortar, nor that it is commonly used. Otherwise, I don’t find the approach incorrect. Open joints at the top should be left for drainage, but normally we install joint ventilators to prevent too much debris or insects from entering. Installing them at the bottom is also reasonable.
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