Dought & clear, - [ Prayers] - Praying in a place under which there is a sewage pipe.

A man has an apartment in which there is a bookstore containing copies
of the Holy Qur'aan. But there is a sewage pipe which passes beneath
this apartment. Is it permissible to pray and recite Qur'aan there or
not? Please advise us, may Allaah reward you with good.
Praise be to Allaah.
There is nothing wrong with this so long as (the apartment) is
separate (from the pipe). Al-Imaam al-Muwaffaq, the author
ofal-Mughniand ofal-Sharh al-Kabeer, said: It is permissible to use
the area above the roof of the pipe and similar places, because the
pipe is beneath and there is a roof over it. It is not allowed to pray
in toilets and similar places, but according to the correct view, it
is permissible to pray and read Qur'aan on the roof over them, as we
have stated above. Some scholars said that it is not permissible to do
that, but the correct view, in sha Allaah, is that it is OK. And
Allaah knows best.
Fataawa Shaykh 'Abd-Allaah ibn Humayd, p. 62