How the hell am I going to get the floor tiles?

Ditra Matting on top of chipboard is a no no.
Looks like it will be necissary to lay 12mm ply ontop of the chip board.
But will the underfloor heating stil work???? Oh man!

Dear Michael

Thank you for your enquiry.

Prior to laying Schlüter^®-DITRA the floor should be even, rigid and load bearing.  The use of a spreader plate system precludes the use of noggins to support the board joints, these are required to ensure a rigid substrate.  

Furthermore, Schlüter^®-DITRA needs to be bonded to the substrate, chipboard flooring with an impregnation layer does not allow for a successful bond.

We are therefore unable to recommend  Schlüter^®-DITRA for this application.  However, should you require any further assistance in the future please feel free to contact us here at Bardon 22.

Yours sincerely


Andrew Curry
Trainee Business Development Manager

Schlüter-Systems Ltd
Units 4-5 Bardon 22  .  Beveridge Lane
COALVILLE  .  Leicestershire  .  LE67 1TE                            

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From:        Michael McAndrew <Michael.McAndrew@henderson.com>
To:        "technical@schluter.co.uk" <technical@schluter.co.uk>
Date:        22/10/2012 14:39
Subject:        Ditra Matting advice - Tiling on chipboard with underfloor heating

---

Good afternoon,
 
My builder is installing a wet under floor heating system to the suspended floor in my new ground floor extension (polypipe spreader plates).
He is then going to lay 22mm weatherproof chipboard onto the joists. I want to have the floor tiled, but want to make sure I specify the correct construction and to make sure this will not adversely affect the under floor heating.
 
1.     Can you recommend what products I should be used to prepare and bond the Ditra matting to the chipboard?
 
2.     Would the chipboard need to be prepared in anyway (somebody suggested the weather proof surface would have to be sanded to get a good bond)?
 
3.     Can you recommend what adhesive and grout I should be used to bond porcelain tiles to the Ditra matting?
 
4.     Would you expect the matting to reduce the efficiency of the UFH?
 
 
Thanks in advance for your advice,
 
Regards,
Michael McAndrew