Head off 45mm. WTF! Suggestions. 2 questions

[hail hail]

Howya, ive a head here out 45mm from the top of the double door. Any suggestions on how to bring it down other than dubbing it out.

I was suggesting cement board stuck on with exterior tile adhesive then scratch and float. We where actually instructed to do this before on a head by an architect when it was 55mm out before and never no issues.

The client got tile backer board which I'm not to sure about. I know these can withstand any moisture because they are for wet rooms but will they take sand and cement even if primmed with sbr and sbr in the mix.

 

[essexandy]

Whatever you decide to do make sure you've got it in writing that you won't be held responsible for any problems resulting from trying to remedy someone else's fuckup.
If they don't want to get a bag of Maite or equivalent to go over the board then a cement/SBR slurry on the board, immediately followed by a sand/cement/SBR scratch coat should stay bonded.
What you reckon @John j you're the king of bodge jobs?

 

[bobski]

Howya, ive a head here out 45mm from the top of the double door. Any suggestions on how to bring it down other than dubbing it out.

I was suggesting cement board stuck on with exterior tile adhesive then scratch and float. We where actually instructed to do this before on a head by an architect when it was 55mm out before and never no issues.

The client got tile backer board which I'm not to sure about. I know these can withstand any moisture because they are for wet rooms but will they take sand and cement even if primmed with sbr and sbr in the mix.




View attachment 80591

I'd get lightweight tile backer board (XPS core) like marmox, then some high polymer render that can also be used as an insulation adhesive - then you'll know it'll stick.

Personally I'd grab something like EWI 225 or equivalent, (absolutely will not shift with the door/window slamming) and also scratch with the same gear.

Then top aswell later with same product (fresh batch).

 

[hail hail]

Whatever you decide to do make sure you've got it in writing that you won't be held responsible for any problems resulting from trying to remedy someone else's fuckup.
If they don't want to get a bag of Maite or equivalent to go over the board then a cement/SBR slurry on the board, immediately followed by a sand/cement/SBR scratch coat should stay bonded.
What you reckon @John j you're the king of bodge jobs?

Whatever you decide to do make sure you've got it in writing that you won't be held responsible for any problems resulting from trying to remedy someone else's fuckup.
If they don't want to get a bag of Maite or equivalent to go over the board then a cement/SBR slurry on the board, immediately followed by a sand/cement/SBR scratch coat should stay bonded.
What you reckon @John j you're the king of bodge jobs?

O definitely already been agreed nothing to do with me if it fails.

The tile backer board is up with exterior tile adhesive. Any insulation ya see from the backer board been covered with scrim and all covered with tile addy. Well braced up with timber.

Will slurry with cement and sbr and hit with a scratch with sbr soon as the slurry takes up.


What ratio of slurry? Will 1:1 be ok or 2 cement 1 slurry.

 

[essexandy]

O definitely already been agreed nothing to do with me if it fails.

The tile backer board is up with exterior tile adhesive. Any insulation ya see from the backer board been covered with scrim and all covered with tile addy. Well braced up with timber.

Will slurry with cement and sbr and hit with a scratch with sbr soon as the slurry takes up.


What ratio of slurry? Will 1:1 be ok or 2 cement 1 slurry.

Just add cement to the SBR until it's a nice brushable consistency.