How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Plumberpro Your Own Question

Plumberpro
Plumberpro, Plumber
Category: Plumbing
Satisfied Customers: 634
Experience:  Heating and plumbing answers. 20 years experience
77408428
Type Your Plumbing Question Here...
Plumberpro is online now

1)Underfloor heating and celotex insulation2)Secondary circulation My

Resolved Question:

1)Underfloor heating and celotex insulation2)Secondary circulation
My plumber has fixed underfloor heating pipes to celotex. he has to leave a gap/a ditch between celotex for the water pipes and hot and cold feeds which are all insulated. He proposes pouring screed over them . I am concerned that this will encase them and future repairs would be impossible. UFH firm suggested a thin layer of celotex on top/a bridge to accommodate pipes but apparently this is too weak when one walks on them.
Any solutions or suggestions?
It was suggested by Air source heat pump firm to have a secondary circulation to ensure hot water doesn't take long to travel from the location of air source heat pump outside the house to the taps. Plumber says this is not necessary . Any suggestions of comments would be greatly appreciated
Submitted: 2 years ago.
Category: Plumbing
Expert:  Plumberpro replied 2 years ago.
Plumberpro :

Unfortunately , this is one of the issues with underfloor heating. The pipework is often sealed in someway under Neath a flooring surface. Underfloor heating is often placed in a concrete screed . the pipe work should be pressurised and tested before this to check the pipework for leaks before covering and also left pressurised when covered to allow for pipe expansion when the system is hot. Your plumber will know if secondary circulation is necessary , if qualified or experienced .I have fitted it in multi bathroom situations. You have to remember it saves a few seconds of running the hot tap but costs a lot energy wise as the pump is continuously circulating hot water that cools and then has to be reheated.

Customer:

Thnak you. Any suggestions as to what can be used to cover the insulated pipes between the celotex(hot and cold feeds from 2 manifolds and water pipe 28mm all insulated)

Customer:

is it ok to pour screed in this area which is a 100mm ditch between celotex and on top of DPC

Plumberpro :

Yes , its fine to pour the screed on top of the dpc. To be honest the pipes don't have to be covered. The one thing you don't want is to do all this work and find that you are just not getting any heat out of the underfloor heating .. The screed is supposed to be in direct contact with the pipework so the whole screed heats up as a block . I found a website that can show you this being done in action .

Plumberpro :

http://www.flowcrete.co.uk/specification-zone/underfloor-heating-and-screeding/

Customer:

thank you

Plumberpro, Plumber
Category: Plumbing
Satisfied Customers: 634
Experience: Heating and plumbing answers. 20 years experience
Plumberpro and other Plumbing Specialists are ready to help you

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy
< Previous | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
 
 
 

Meet The Experts:

 
 
 
  • theplumber717

    theplumber717

    Plumber

    Satisfied Customers:

    516
    Lic plumbing and heating contractor, 28 years exp
< Previous | Next >
  • http://ww2.justanswer.com/uploads/TH/theplumber717/2011-11-24_34039_DSCF7012.64x64.JPG theplumber717's Avatar

    theplumber717

    Plumber

    Satisfied Customers:

    516
    Lic plumbing and heating contractor, 28 years exp
  • http://ww2.justanswer.com/uploads/PL/Plumberpro/2014-6-23_6520_image.64x64.jpg Plumberpro's Avatar

    Plumberpro

    Plumber

    Satisfied Customers:

    202
    Heating and plumbing answers. 20 years experience
  • http://ww2.justanswer.com/uploads/BI/billyjr1961/2013-9-27_11122_ATT1351123267229photo.64x64.JPG Billy's Avatar

    Billy

    Technician

    Satisfied Customers:

    206
    Mechanical Contractor
  • /img/opt/shirt.png Brian's Avatar

    Brian

    Plumber

    Satisfied Customers:

    47
    16 yrs. experience as plumber, including full bathroom and kitchen installations.
  • http://ww2.justanswer.com/uploads/MA/MarkAYng/2011-1-15_16358_Markcameo2008b.64x64.jpg MarkAYng's Avatar

    MarkAYng

    Handyman

    Satisfied Customers:

    0
    Knowledgeable in home, electrical and small appliance repair.
  • http://ww2.justanswer.com/uploads/AS/AssuredElectrical/2011-9-13_221243_me.64x64.gif AssuredElectrical's Avatar

    AssuredElectrical

    Home Improvement Enthusiast

    Satisfied Customers:

    332
    Electrical contractor's license
 
 
 

Related Plumbing Questions