ᐅ Garage built into a slope, exterior waterproofing, is rigid foam insulation necessary?
Created on: 18 Apr 2024 12:47
R
Richie_EsR
Richie_Es18 Apr 2024 12:47Hello everyone,
We had to build a double garage into a slope due to limited space. The soil is very clayey and drains water poorly.
The garage wall thickness is 25cm (10 inches), poured with waterproof concrete. A bitumen primer and bitumen coating have already been applied. The sleeves in the wall were additionally sealed on the outside with bitumen roofing felt.
Now the question:
How should the garage be properly waterproofed on the slope side? Should extruded polystyrene (XPS) boards be glued to the bitumen on the outside and then covered with a dimpled membrane? Followed by a layer of frost protection gravel?
Does anyone have good experience with this?
Photo attached.
Thank you in advance.
Regards, Richie
We had to build a double garage into a slope due to limited space. The soil is very clayey and drains water poorly.
The garage wall thickness is 25cm (10 inches), poured with waterproof concrete. A bitumen primer and bitumen coating have already been applied. The sleeves in the wall were additionally sealed on the outside with bitumen roofing felt.
Now the question:
How should the garage be properly waterproofed on the slope side? Should extruded polystyrene (XPS) boards be glued to the bitumen on the outside and then covered with a dimpled membrane? Followed by a layer of frost protection gravel?
Does anyone have good experience with this?
Photo attached.
Thank you in advance.
Regards, Richie
Was only waterproof concrete (WU concrete) poured, or was a full waterproof concrete shell built? In other words: including sealing of all joints as well as crack width control through reinforcement?
If it is a complete waterproof concrete structure, why was bitumen applied as well? That seems redundant. If not, then using waterproof concrete wasn’t necessarily required, since the bitumen is intended to provide the waterproofing.
The Styrodur boards have no waterproofing function. In this case, they were only meant to serve as mechanical protection for the bitumen membrane (or as thermal insulation, if needed, but then the entire assembly should have been insulated accordingly). You can do it either way, but depending on the drainage concept, it might make more sense to fix XPS drainage boards.
If it is a complete waterproof concrete structure, why was bitumen applied as well? That seems redundant. If not, then using waterproof concrete wasn’t necessarily required, since the bitumen is intended to provide the waterproofing.
The Styrodur boards have no waterproofing function. In this case, they were only meant to serve as mechanical protection for the bitumen membrane (or as thermal insulation, if needed, but then the entire assembly should have been insulated accordingly). You can do it either way, but depending on the drainage concept, it might make more sense to fix XPS drainage boards.
R
Richie_Es18 Apr 2024 13:50Thank you for your reply.
On the edge of the concrete slab, where the wall was built, 20cm (8 inches) high sealing strips were cast in between the reinforcement.
We applied bitumen on the outside as additional protection, also to prevent the dimpled membrane from being damaged later on the exterior wall of the garage.
For drainage, we plan to install perforated drainage pipes around the garage. First, we will stabilize the ground with gravel. The pipes will then be covered with a geotextile fabric and more gravel before backfilling with mixed soil.
The garage space is intended to be kept “just” dry and to be used occasionally as a party room.
On the edge of the concrete slab, where the wall was built, 20cm (8 inches) high sealing strips were cast in between the reinforcement.
We applied bitumen on the outside as additional protection, also to prevent the dimpled membrane from being damaged later on the exterior wall of the garage.
For drainage, we plan to install perforated drainage pipes around the garage. First, we will stabilize the ground with gravel. The pipes will then be covered with a geotextile fabric and more gravel before backfilling with mixed soil.
The garage space is intended to be kept “just” dry and to be used occasionally as a party room.
Similar topics