ᐅ House and garage: should the gap between the two structures be closed?
Created on: 15 Jun 2017 10:18
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Nordlys
The situation: The main structure of the house is made of Ytong blocks, plastered. The garage is a precast concrete garage. Both are positioned close together, tightly adjacent.
The part of the house where the garage meets is not plastered, so the Ytong blocks are exposed. Should the gap be sealed with PU foam or silicone, or left open for ventilation? What is the professional recommendation?
The part of the house where the garage meets is not plastered, so the Ytong blocks are exposed. Should the gap be sealed with PU foam or silicone, or left open for ventilation? What is the professional recommendation?
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Bieber081519 Jun 2017 10:33Here, the roof overhang provides sufficient protection; otherwise, a roof-to-wall connection strip should be installed (fixed to the wall, loosely resting on the garage).
It is important that the connection or joint is made permanently elastic, as there are two different structural elements.
By the way, the question of whether the wall should have been plastered has already been discussed in this forum.
It is important that the connection or joint is made permanently elastic, as there are two different structural elements.
By the way, the question of whether the wall should have been plastered has already been discussed in this forum.
The joints have now been sealed with an MS polymer seam. It is completely watertight. I still had an expired but still usable cartridge on the boat. Now it’s all used up. Regarding the question of plastering, the builder says: If we had built with facing bricks, the Ytong would not have been plastered either. The concrete garage protects the block like a brick wall would. That also makes sense to me. Karsten
Bieber0815 schrieb:
The question of whether the wall should have been plastered has actually come up in this forum before. see https://www.hausbau-forum.de/threads/grenzwand-beim-Reihenhaus-wetterfest-machen-wenn-nicht-gleizeitig-gebaut-wird.23942/#post-198164 (contains additional links to related threads)
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Pitiglianio4 Jan 2023 19:43I'm digging up an old thread.
I'm currently facing a similar issue.
The house is being built by the general contractor. The shell structure is complete. The garage is being built as a self-build project, directly adjoining the house wall. The gap between the house wall and the garage wall is 2cm (about 0.8 inches).
The house wall is monolithic, made of 36.5cm (14.4 inches) Poroton blocks. It is already standing.
The garage wall will be made from 24cm (9.4 inches) concrete blocks. It is not built yet.
As mentioned: the gap between the two walls will be 2cm (about 0.8 inches).
Should this gap be left "ventilated" or filled with, for example, 2cm (about 0.8 inches) XPS insulation boards or similar?
A flashing will be installed on top between the house and garage wall to protect the gap from rain.
What do you think is the smartest way to handle this?
I'm currently facing a similar issue.
The house is being built by the general contractor. The shell structure is complete. The garage is being built as a self-build project, directly adjoining the house wall. The gap between the house wall and the garage wall is 2cm (about 0.8 inches).
The house wall is monolithic, made of 36.5cm (14.4 inches) Poroton blocks. It is already standing.
The garage wall will be made from 24cm (9.4 inches) concrete blocks. It is not built yet.
As mentioned: the gap between the two walls will be 2cm (about 0.8 inches).
Should this gap be left "ventilated" or filled with, for example, 2cm (about 0.8 inches) XPS insulation boards or similar?
A flashing will be installed on top between the house and garage wall to protect the gap from rain.
What do you think is the smartest way to handle this?
Pitiglianio schrieb:
Monolithic house wall made of 36.5 Poroton. Already in place.
Garage wall made of 24 cm (9.5 inches) shuttering blocks. Not built yet.
As mentioned before: the gap between the two walls will be 2 cm (0.8 inches). That seems contradictory to me: the second wall is not built yet, but the gap is already fixed.
A 2 cm (0.8 inches) gap could already be almost entirely consumed by tolerances in some spots; maintaining a constant 2 cm (0.8 inches) gap requires quite some experience.
Pitiglianio schrieb:
Should the gap be left "ventilated" or closed, for example with 2 cm (0.8 inches) XPS boards or similar?
A connecting flashing between the house and garage wall will protect the gap from rain from above.
What do you think is the smartest way to handle this? No, of course I have no experience with clumsy constructions *smile*
and a gap almost exactly matching textbook expansion joint thickness is certainly best kept as an air space, although it should be sealed well not only against rain. The seal needs to be flexible to avoid transferring any forces.
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