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Thanks everyone.

Concrete is being sprayed onto rebar with a concrete block wall behind. (see photo.) [/img]

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...

Hey Glasgowgas, Thanks for your help. I've just found this: http://www.ryanairconspares.com/aspen-return-valve-10mm-p-657.html Thanks everyone - great forum! MB

Hi Glasgowgas, I visit the UK very regularly and would prefer to buy from there. Any ideas on a part number from, say, Plumbase? Thanks again for your help. MB.

Hi Glasgowgas, Great suggestion, where can I buy one? Regards, MB.

Norcan and ColJack, Great ideas - i'll see if there is sufficient 'drop' to do this. Thanks, MB.

Hi, The drain tube and the soil vent pipes are buried deep inside the walls of the house. The only access that I have to any part of the air conditioning drainage system is where the tube comes out of the wall directly behind the wall mounted interior aircon unit. I therefore have very little...

As I mentioned the only access I have to the drain tube is behind the interior wall unit. The soil vent pipe is embedded in a wall.

Hi Thanks for you reply. The only access I have to the Aircon drainage tube is behind the interior wall unit, and therefore I cannot install a full sized trap.

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'll get a survey done. Thanks for your help with this.

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...

Job done, many thanks for the advice. Rgds.