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Hi, I am having a pool installed here in Spain. The contractor ran out of time to complete the job in one day and left one of the walls unsprayed. He will return in two days to complete the work. I am concerned that spraying over already set concrete will leave this wall weak. I would...

I've just had two air conditioners installed in my house with the drainage tubes being plumbed directly into a soil vent pipe. Initially when the units are turned on smells are drawn up through the drainage tube and into the room. The smells stop after the water starts flowing down the tube...

I'm building a retaining wall using 'H' blocks (see picture). Each block will have 4 vertical rebars and 2 horizontal rebars and will be filled with concrete. I live in Spain and my builder has never seen blocks like this before. He wants to lay them in the standard staggered fashion, however I...

I would very much appreciate advice on how best to build a concrete block wall to support a soil bank. The wall area measures 3 meters high x 10 meterslong. I plan to to install vertical rebar surrounded by concrete inside as many blocks as possible, and horizontal rebar in concrete every 1...

Hi. I am installing a new septic tank and associated pipe work from scratch in a bungalow. I would appreciate answers to the following questions. 1) What gradient should I use for Foul water pipes and Grey water pipes? 2) I intend to have the Foul and Grey water falling into their own...

Hi. I am installing a new septic tank and associated pipe work from scratch in a bungalow. I would appreciate answers to the following questions. 1) What gradient should I use for Foul water pipes and Grey water pipes? 2) I intend to have the Foul and Grey water falling into their own...

Hi, I am installing a 10,000 litre (10,000 kgs) fiberglass below ground water deposit. Obviously I have to construct a reinforced foundation to support it, but I don't know what concrete mixture ratio to use. Any ideas? Thanks in advance.