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Author:
g-rock (Non-US)
We are restoring an old house in a small town in Spain. There is just one main waste-water pipe that connects all waste-water from the house to the public sewage system, that includes from taps and from the WC. The two systems are not separate in this town.
We are converting the downstairs garage and WC to a kitchen and laundry room. We have discovered that the plumber connected the waste-water pipes directly to the WC pipe without any trap. This runs under the house and connects to the public sewage network, no trap. My question is: is it sufficient to install a trap at the connection point to the washing machine and kitchen sink? Should we also install an additional trap further down the main waste-water pipe on our property?
We are getting conflicting and confusing advice locally and would appreciate any guidance.
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Author:
asktom (MT)
Everything needs a trap except the WC, which has a trap built into it. All the fixtures must also be properly vented so that trap seals are not broken, which would allow sewer gas to enter the structure. What "properly vented" means is too complicated and site specific to explain in a sentence or two. A trap for the whole structure is not necessary.
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Author:
g-rock (Non-US)
Thanks very much, that has put my mind at rest regarding the traps at the bottom of the house. Your comment also led me to check the ventilation. It seems the drain on the terrace is the top of the vent, which the builders have covered with a drain cover that contains a trap, to stop the smell coming out. I am very grateful that you mentioned this as we would not have cottoned on, even though it seems we now have a new issue to resolve.
Edited 1 times.
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