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peterbocholt8 Dec 2015 20:06Hello forum, we are planning an extension to our existing house (built in 1976). It will be a double garage (9 x 7 m (30 x 23 feet) externally) with living space above and half of the roof as a terrace. Now I’m considering adding a basement.
The existing house has a masonry cellar, and according to my father-in-law, the cellar floods in winter (not in summer). This has caused problems in the past because the masonry is only treated externally with a bitumen coating and internally with a waterproof plaster.
The new basement would need to be attached to the old one, and access from the old basement would have to be created.
I have many questions as I’m looking for ideas for the project. I haven’t talked to the architect about this yet.
What is the approximate cost of a basement (I know it’s hard to say exactly) as a black tank or white tank?
Is it even feasible to build a black tank under these conditions? I would do the black tank work myself — we can handle the masonry here... How does doing some of the work yourself affect the costs?
Also, there is the question of waterproofing between the two basements, especially at the connection. Are there reliable systems for sealing these joints?
I look forward to your answers, suggestions, critiques, and ideas.
Kind regards from Bocholt
peterbocholt
The existing house has a masonry cellar, and according to my father-in-law, the cellar floods in winter (not in summer). This has caused problems in the past because the masonry is only treated externally with a bitumen coating and internally with a waterproof plaster.
The new basement would need to be attached to the old one, and access from the old basement would have to be created.
I have many questions as I’m looking for ideas for the project. I haven’t talked to the architect about this yet.
What is the approximate cost of a basement (I know it’s hard to say exactly) as a black tank or white tank?
Is it even feasible to build a black tank under these conditions? I would do the black tank work myself — we can handle the masonry here... How does doing some of the work yourself affect the costs?
Also, there is the question of waterproofing between the two basements, especially at the connection. Are there reliable systems for sealing these joints?
I look forward to your answers, suggestions, critiques, and ideas.
Kind regards from Bocholt
peterbocholt
If there have been previous water damage issues in the old basement, I wouldn’t recommend reopening the carefully sealed system. Do you have a large enough plot of land? Then build an earth mound with an underground cellar in the middle. It’s great for planting culinary and medicinal herbs and is the best pantry you can ask for to store potatoes and similar items.
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