Durock board/Gypoc cement board
- Thread starter solway
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warriorupnorth
Private Member
nnever used it , but i would assume that an high polymer render would be required for a direct bond, but i could be wrong, what do the manufacturers tech literature say ?
Runswithscissors
Private Member
Hi Solway
I think you may have your brand names mixed up there......
Durock is a USG Cement Board that I don't think is available in the UK (let me know if I'm wrong, and where you got it from....)
Gyproc is a Gypsum based product.... so you will need to get confirmation from the supplier for S&C onto that type of board - but I think you will find the answer is NO....
You can apply S&C onto Aquapanel Exterior, but we would advise you apply a thin coat approved basecoat and mesh on first then a thinner layer of S&C than would be normally applied to say block work (thinner layer of S&C is due to weight of S&C while wet onto the face of the board, due to risk of delamination. Basecoat and mesh holds the structure together and reduces risk of cracking along board lines with just S&C).
What are you looking at doing anyway? and where?
Feel free to contact me to discuss further....
Richard Lord
Aquapanel Specification Manager
07918766577
[email protected]
I think you may have your brand names mixed up there......
Durock is a USG Cement Board that I don't think is available in the UK (let me know if I'm wrong, and where you got it from....)
Gyproc is a Gypsum based product.... so you will need to get confirmation from the supplier for S&C onto that type of board - but I think you will find the answer is NO....
You can apply S&C onto Aquapanel Exterior, but we would advise you apply a thin coat approved basecoat and mesh on first then a thinner layer of S&C than would be normally applied to say block work (thinner layer of S&C is due to weight of S&C while wet onto the face of the board, due to risk of delamination. Basecoat and mesh holds the structure together and reduces risk of cracking along board lines with just S&C).
What are you looking at doing anyway? and where?
Feel free to contact me to discuss further....
Richard Lord
Aquapanel Specification Manager
07918766577
[email protected]
Last edited:
Hi Richard. Im in Ireland and at the moment im doing a school and there is an area where some exterior soffits have to be plastered. I was thinking maybe of filling and scrimming the joints with the proper materials fixing riplathe and plastering with sand/cement. Ive seen it done this way before and its still 100%.Another way ive seen it done is fill and scrim the joints scud the board with pva mixed through and plaster next day also 100%.
johniosaif
Private Member
hi,glad that some one is working in Ireland, did you consider using one of the modern renders ? Using microbiogetis instead of scud with pva ? Where in Ireland are you working
Runswithscissors
Private Member
Hi Solway
see the attached brochure, refer to pages 16 and 17 for soffit linings.
Knauf Aquapanel Exterior
1. There is always the problem of wind loading, both upward pressure and downward suction, so the backing needs to be designed properly to hold whatever board you use......
2. Then, using a gypsum based board runs the risk of having atmospheric moisture (fog, mist - water in the air) getting to the board and causing delamination of the paper face from the gypsum core in the long term......
2. Add the fact that you then want to add a heavy layer of S&C on a soffit (upside down) and Gravity is a cruel mistress..... LOL
I would not want to be underneath something that is not really suitable for the external application in the long term.....
There are other options out their, but feel free to give me a call tomorrow and if I can't sort it for you on the phone, we will arrange for our Irish Spec Manager come out and sort you out....
Good Luck....
Richard
see the attached brochure, refer to pages 16 and 17 for soffit linings.
Knauf Aquapanel Exterior
1. There is always the problem of wind loading, both upward pressure and downward suction, so the backing needs to be designed properly to hold whatever board you use......
2. Then, using a gypsum based board runs the risk of having atmospheric moisture (fog, mist - water in the air) getting to the board and causing delamination of the paper face from the gypsum core in the long term......
2. Add the fact that you then want to add a heavy layer of S&C on a soffit (upside down) and Gravity is a cruel mistress..... LOL
I would not want to be underneath something that is not really suitable for the external application in the long term.....
There are other options out their, but feel free to give me a call tomorrow and if I can't sort it for you on the phone, we will arrange for our Irish Spec Manager come out and sort you out....
Good Luck....
Richard
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